DSH-201723C
July 31, 2008
CX93010-2x UCMxx
USB V.92/V.34/V.32bis Controllered
Modem with CX20548 SmartDAA
Data Sheet
Conexant Proprietary Information
Conexant Confidential Information
Dissemination, disclosure, or use of this information is not permitted
without the written permission of Conexant Systems, Inc.
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
ii Conexant Proprietary and Confidential Information DSH-201723C
Revision Record
Revision Date Comments
A 7/2/2008 Initial release.
B 7/29/2008 Rev B release
C 7/31/2008 Rev C release
© 2008 Conexant Systems, Inc.
All Rights Reserved.
Information in this document is provided in connection with Conexant Systems, Inc. (“Conexant”) products. These materials are
provided by Conexant as a service to its customers and may be used for informational purposes only. Conexant assumes no
responsibility for errors or omissions in these materials. Conexant may make changes to this document at any time, without notice.
Conexant advises all customers to ensure that they have the latest version of this document and to verify, before placing orders, that
information being relied on is current and complete. Conexant makes no commitment to update the information and shall have no
responsibility whatsoever for conflicts or incompatibilities arising from future changes to its specifications and product descriptions.
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THESE MATERIALS ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED,
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For additional disclaimer information, please consult Conexant’s Legal Information posted at www.conexant.com which is
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CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
DSH-201723C Conexant Proprietary and Confidential Information iii
Contents
Document Revision History..........................................................................................................vii
1. Introduction ..........................................................................................................................1-1
1.1 Overview ...................................................................................................................................................1-1
1.2 Features....................................................................................................................................................1-4
1.2.1 Modem Features.........................................................................................................................1-4
1.2.2 SmartDAA Features....................................................................................................................1-5
1.2.3 Applications ................................................................................................................................1-6
1.3 Technical Overview...................................................................................................................................1-6
1.3.1 General Description ....................................................................................................................1-6
1.3.2 Embedded MCU Firmware .........................................................................................................1-6
1.3.3 Operating Modes ........................................................................................................................1-7
1.3.3.1 Data/Fax Modes ...........................................................................................................1-7
1.3.3.2 V.44 Data Compression................................................................................................1-7
1.3.3.3 Synchronous Access Mode (SAM) - Video Conferencing.............................................1-8
1.3.3.4 Worldwide Operation ....................................................................................................1-8
1.3.3.5 TAM Mode ..................................................................................................................1-10
1.3.4 Reference Designs ...................................................................................................................1-10
1.4 Hardware Description..............................................................................................................................1-10
1.4.1 CX93010-2x UCMxx USB Modem............................................................................................1-10
1.4.2 Digital Isolation Barrier..............................................................................................................1-11
1.4.3 CX20548 SmartDAA 4 Line Side Device ..................................................................................1-11
1.5 Commands..............................................................................................................................................1-11
2. Technical Specifications.......................................................................................................2-1
2.1 USB Interface Operation ...........................................................................................................................2-1
2.2 Establishing Data Modem Connections ....................................................................................................2-1
2.2.1 Telephone Number Directory......................................................................................................2-1
2.2.2 Dialing.........................................................................................................................................2-1
2.2.3 Modem Handshaking Protocol....................................................................................................2-1
2.2.4 Call Progress Tone Detection .....................................................................................................2-1
2.2.5 Answer Tone Detection...............................................................................................................2-1
2.2.6 Ring Detection ............................................................................................................................2-1
2.2.7 Billing Protection .........................................................................................................................2-2
2.2.8 Connection Speeds ....................................................................................................................2-2
2.2.9 Automode ...................................................................................................................................2-2
2.3 Data Mode ................................................................................................................................................2-3
2.3.1 Speed Buffering (Normal Mode) .................................................................................................2-3
2.3.2 Flow Control................................................................................................................................2-3
2.3.3 Escape Sequence Detection.......................................................................................................2-3
2.3.4 BREAK Detection .......................................................................................................................2-3
2.3.5 Telephone Line Monitoring .........................................................................................................2-3
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
iv Conexant Proprietary and Confidential Information DSH-201723C
2.3.6 Fall Forward/Fallback (V.92/V.90/V.34/V.32bis/V.32).................................................................2-3
2.3.7 Retrain ........................................................................................................................................2-4
2.3.8 Programmable Inactivity Timer ...................................................................................................2-4
2.4 V.92 Features (V.92 Model) ......................................................................................................................2-4
2.4.1 Modem-on-Hold ..........................................................................................................................2-4
2.4.2 Quick Connect ............................................................................................................................2-4
2.4.3 PCM Upstream ...........................................................................................................................2-5
2.5 Error Correction and Data Compression ...................................................................................................2-5
2.5.1 V.42 Error Correction..................................................................................................................2-5
2.5.2 MNP 2-4 Error Correction ...........................................................................................................2-5
2.5.3 V.44 Data Compression..............................................................................................................2-5
2.5.4 V.42bis Data Compression .........................................................................................................2-5
2.5.5 MNP 5 Data Compression ..........................................................................................................2-5
2.6 Telephony Extensions...............................................................................................................................2-6
2.6.1 Line In Use Detection..................................................................................................................2-6
2.6.2 Extension Pickup Detection ........................................................................................................2-6
2.6.3 Remote Hangup Detection..........................................................................................................2-6
2.7 Fax Class 1, Fax Class 1.0, and Fax Class 2 Operation...........................................................................2-6
2.8 Caller ID ....................................................................................................................................................2-7
2.9 Worldwide Country Support ......................................................................................................................2-7
2.10 Diagnostics ...............................................................................................................................................2-8
2.10.1 Commanded Tests .....................................................................................................................2-8
2.11 Low Power Stop Mode ..............................................................................................................................2-8
3. Hardware Interface...............................................................................................................3-1
3.1 CX93010-2x UCMxx USB Modem Hardware Pins and Signals ................................................................3-1
3.1.1 General .......................................................................................................................................3-1
3.1.1.1 USB Interface ...............................................................................................................3-1
3.1.1.2 LED Interface................................................................................................................3-1
3.1.1.3 LSD Interface (Through DIB) ........................................................................................3-1
3.1.1.4 Call Progress Speaker Interface ...................................................................................3-1
3.1.1.5 Serial EEPROM Interface .............................................................................................3-1
3.1.2 CX93010-2x Signal Interface, Pin Assignments, and Signal Definitions .....................................3-2
3.2 CX20548 LSD Hardware Pins and Signals ...............................................................................................3-7
3.2.1 General .......................................................................................................................................3-7
3.2.1.1 Host Side Device (HSD) Interface (Through DIB).........................................................3-7
3.2.1.2 Power and Ground........................................................................................................3-7
3.2.1.3 Telephone Line Interface ..............................................................................................3-7
3.2.1.4 Voltage References ......................................................................................................3-7
3.2.1.5 General Purpose Input/Output......................................................................................3-7
3.2.2 Pin Assignments and Signal Definitions......................................................................................3-8
3.3 Electrical and Environmental Specifications............................................................................................3-12
3.3.1 Operating Conditions, Absolute Maximum Ratings, and Power Requirements ........................3-12
3.4 Crystal Specifications..............................................................................................................................3-14
4. Package Dimensions ...........................................................................................................4-1
5. Recommended QFN Surface Mount Land Patterns ............................................................5-1
6. USB General Operation .......................................................................................................6-1
6.1 Descriptors................................................................................................................................................6-1
6.1.1 Device Descriptor .......................................................................................................................6-1
6.1.2 Configuration Descriptor .............................................................................................................6-3
6.1.3 Interface Descriptor ....................................................................................................................6-4
6.1.4 Endpoint Descriptor ....................................................................................................................6-5
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
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6.1.5 Enumeration ...............................................................................................................................6-6
6.1.6 Endpoints....................................................................................................................................6-6
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
vi Conexant Proprietary and Confidential Information DSH-201723C
Figures
Figure 1-1. UCMxx USB Modem Simplified Interface Diagram.................................................................................. 1-3
Figure 1-2. UCMxx USB Modem Major Interfaces ..................................................................................................... 1-3
Figure 3-1. CX93010-2x UCMxx USB Modem Hardware Signals.............................................................................. 3-2
Figure 3-2. CX93010-2x UCMxx USB Modem 20-Pin QFN Pin Signals .................................................................... 3-3
Figure 3-3. CX20548 LSD Hardware Interface Signals.............................................................................................. 3-8
Figure 3-4. CX20548 LSD 16-Pin QFN Pin Signals ................................................................................................... 3-9
Figure 4-1. Package Dimensions for 20-Pin QFN ...................................................................................................... 4-2
Figure 4-2. Package Dimensions for 16-Pin QFN ...................................................................................................... 4-3
Figure 5-1. Recommended Surface Mount Land Pattern for 20-Pin QFN.................................................................. 5-1
Figure 5-2. Recommended Surface Mount Land Pattern for 16-Pin QFN.................................................................. 5-2
Tables
Table 1-1. UCMxx USB Modem Ordering Information ............................................................................................... 1-2
Table 1-2. Default Countries Supported..................................................................................................................... 1-8
Table 2-1. +MS Command Automode Connectivity ................................................................................................... 2-2
Table 3-1. CX93010-2x UCMxx USB Modem 20-Pin QFN Pin Signals ..................................................................... 3-3
Table 3-2. CX93010-2x UCMxx USB Modem Pin Signal Definitions ......................................................................... 3-4
Table 3-3. CX93010-2x UCMxx USB Modem I/O Type Definitions............................................................................ 3-5
Table 3-4. CX93010-2x UCMxx USB Modem DC Electrical Characteristics.............................................................. 3-6
Table 3-5. CX20548 LSD 16-Pin QFN Pin Signals .................................................................................................... 3-9
Table 3-6. CX20548 LSD Hardware Signal Definitions ............................................................................................ 3-10
Table 3-7. CX20548 LSD GPIO DC Electrical Characteristics ................................................................................. 3-11
Table 3-8. CX20548 LSD AVDD and DVDD DC Electrical Characteristics..............................................................3-11
Table 3-9. Operating Conditions .............................................................................................................................. 3-12
Table 3-10. Absolute Maximum Ratings .................................................................................................................. 3-12
Table 3-11. Current and Power Requirements......................................................................................................... 3-13
Table 3-12. Crystal Specifications............................................................................................................................ 3-14
Table 6-1. Device Descriptors .................................................................................................................................... 6-2
Table 6-2. Configuration Descriptors.......................................................................................................................... 6-3
Table 6-3. Interface Descriptors ................................................................................................................................. 6-4
Table 6-4. Endpoint Descriptors................................................................................................................................. 6-5
Table 6-5. Endpoints .................................................................................................................................................. 6-6
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
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Document Revision History
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
viii Conexant Proprietary and Confidential Information DSH-201723C
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1. Introduction
1.1 Overview
The Conexant UCMxx USB V.92 Controllered Modem supports V.92 analog data
modem operation with V.44 data compression and supports 14.4 kbps fax modem
operation. In addition, the modem supports remote telephone answering machine (TAM)
and USB host interface operation. Table 1-1 lists the ordering information.
The modem operates with PSTN telephone lines worldwide.
The UCMxx Modem is CDC-compliant and is supported by Microsoft CDC modem
drivers.
The UCMxx Modem device set, consisting of a CX93010-2x USB V.92 Modem in a 20-
pin QFN and a CX20548 SmartDAA LSD in a 16-pin QFN, supports data/fax/TAM
operation with hardware-based modem controller, digital signal processing, and
DAA/telephone line interface functions (Figure 1-1and Figure 1-2).
The UCMxx Modem is compatible with both USB 1.1 and USB 2.0 host controllers and
hubs. This device can send and receive serial data at the maximum 12 Mbps rate.
Conexant's SmartDAA technology (patent pending) eliminates the need for a costly
analog transformer, relays, and opto-isolators typically used in discrete DAA (Data
Access Arrangement) implementations The SmartDAA architecture also simplifies
product implementation by eliminating the need for country-specific board configurations
enabling worldwide homologation of a single modem board design and a single bill of
materials (BOM).
The SmartDAA system-powered DAA operates reliably without drawing power from the
line, unlike line-powered DAAs which operate poorly when line current is insufficient
due to long lines or poor line conditions. Enhanced features, such as monitoring of local
extension status without going off-hook, are also supported.
Incorporating Conexant’s proprietary Digital Isolation Barrier (DIB) design (patent
pending) and other innovative DAA features, the SmartDAA architecture simplifies
application design, minimizes layout area, and reduces component cost.
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
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Table 1-1. UCMxx USB Modem Ordering Information
Model/Order/Part Numbers Supported Functions
Marketing
Name
Device Set
Order No.
UCMxx USB
Modem
[20-Pin QFN]
Part No.
Line Side Device (LSD)
[16-Pin QFN]
Part No.
V.92, V.90
Data
V.34
Data
V.32bis
Data
Fax Class 1 /
Class 2, TAM,
Worldwide
DAA
UCM92(EM) DS92-UCM-21Z CX93010-21Z CX20548-11Z (Note 3) Y Y Y Y
UCM34(EM) DS34-UCM-22Z CX93010-22Z CX20548-11Z (Note 3) — Y Y Y
UCM32bis(EM) DS32-UCM-23Z CX93010-23Z CX20548-11Z (Note 3) — — Y Y
UCM92(PC) DS56-L931-21Z CX93010-21Z CX20548-11Z (Note 3) Y Y Y Y
Notes:
1. Supported functions (Y = Supported; — = Not supported).
2. All devices are lead-free (Pb-free) and RoHS-compliant. These devices are compatible with leaded reflow processes.
3. Device is marked 20548-A on the package
The CX93010-2x USB Modem integrates modem controller (MCU), modem data pump
(MDP), ROM, RAM, and SmartDAA system side device (SSD) functions onto a single
die.
Low profile, small QFN packages and reduced voltage operation with low power
consumption make this device set an ideal solution for V.92 modem USB adapters.
The modem operates by executing firmware from internal ROM and RAM. Customized
modem firmware and added/modified country profiles can be executed from internal
SRAM or serial EEPROM.
In V.92 and V.90 data modes, the modem can receive data at speeds up to 56 kbps from a
digitally connected V.92-compatible central site modem. A V.92 modem takes advantage
of the PSTN which is primarily digital except for the client modem to central office local
loop and are ideal for applications such as remote access to an Internet Service Provider
(ISP), on-line service, or corporate site. In this mode, the modem can transmit data at
speeds up to V.34 rates.
In V.34 data mode, the modem operates at line speeds up to 33.6 kbps.
In V.32bis data mode, the modem operates at lines speeds up to 14.4 kbps.
Data compression (V.44/V.42bis/MNP 5) and error correction (V.42/MNP 2-4) modes
are supported to maximize data throughput and data transfer integrity. V.44 is a more
efficient data compression than V.42bis that significantly increases downstream
throughput thus reducing the download time for the types of files associated with Internet
use, such as Web pages and uncompressed files such as graphics, image, audio, and
document files. V.44 data compression can achieve compression rates of more than 25%
over V.42bis. Typical compression ratio for V.44 on Web type data is approximately 6-1
resulting in overall effective data throughput rate up to 300 kbps for a 56 kbps-
connection. V.44 data compression is not limited to the DTE rate since USB operates at
12 Mbps. Non-error-correcting mode is also supported.
In V.22bis fast connect mode, the modem can connect at 2400 bps with a very short
training time, which is very efficient for small data transfers.
Fax Group 3 send and receive rates are supported up to 14.4 kbps with T.30 protocol.
V.80 synchronous access mode supports host-controlled communication protocols, e. g.,
H.324 video conferencing.
In TAM mode, enhanced 2-bit or 4-bit per sample coding schemes at 8 kHz sample rate
provide flexible format compatibility and allows efficient digital storage of voice/audio.
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
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Also supported are 8-bit A-law, -law, and linear coding and IMA 4-bit ADPCM coding.
This mode supports applications such as digital telephone answering machine, voice
annotation, and recording from and playback to the telephone line.
In-band digital call progress enables the user to hear the call progress during modem
negotiation. This software-enhanced feature eliminates several external components
including an amplifier and a digital speaker. In-band digital call progress contributes to
lower BOM cost and smaller PCB size.
Figure 1-1. UCMxx USB Modem Simplified Interface Diagram
Figure 1-2. UCMxx USB Modem Major Interfaces
CX93010-2x
UCMxx USB V.92 Modem
(20-Pin QFN)
SmartDAA
Interface
Modem Data
Pump (MDP) Digital Speaker
Circuit (Optional) SOUNDUCER
RAM
ROM
Microcontroller
Unit (MCU)
Serial EEPROM
2Kb (256 x 8) to
256KB (32K x 8)
(Optional)
TIP
RING
Telephone
Line Interface
Discrete
Components
TELEPHONE LINE
Digital
Isolation
Barrier
(DIB)
CX20548 SmartDAA
Line Side Device (LSD)
(16-Pin QFN)
Line
Side
DIB
Interface
(LSDI)
Codec
Telephone
Line
Interface
DAA Hardware
Filter
Components
USB
LEDs
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1.2 Features
1.2.1 Modem Features
Full speed (12 MHz) USB interface device implementation
Suspend/Resume
Vendor specific descriptions
Bus powered USB device
Compatible with USB 2.0
Data modem
ITU-T V.92 (V.92 model)
Modem-on-Hold (MOH)
Quick connect (QC)
PCM upstream
V.90 (V.92 model)
V.34 (V.92 model)
V.32bis, V.32, V.22bis, V.22, V.23, and V.21, Bell 212A and Bell 103
V.22bis fast connect
V.250 and V.251 commands
V.80 Synchronous Access Mode
Data compression and error correction
V.44, V.42bis, and MNP 5 data compression
V.42 LAPM and MNP 2-4 error correction
Fax modem send and receive rates up to 14.4 kbps
V.17, V.29, V.27 ter, and V.21 channel 2
EIA/TIA 578 Class 1, T.31 Class 1.0, and Class 2
Interfaces to optional serial EEPROM
Data/Fax/Voice call discrimination
Hardware-based modem controller
Hardware-based digital signal processor (DSP)
Worldwide operation
Complies to TBR21 and other country requirements
On-hook and/or off-hook Caller ID detection for selected countries
Call progress, blacklisting
Internal ROM includes default values for 63 countries
Additional modified country profiles can be stored in internal SRAM or optional
serial EEPROM
In-band digital call progress
Caller waiting detection
Caller ID detect
On-hook Caller ID detection
Off-hook Call Waiting Caller ID detection during data mode when connected to
V.92 server
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Modem customization available through patch code that can be stored in optional
serial EEPROM or internal SRAM
Telephony/TAM
V.253 commands
2-bit and 4-bit ADPCM, 4-bit IMA ADPCM, 8-bit and 16-bit linear PCM, and
8-bit -law and A-law PCM coding
8 kHz sample rate
Concurrent DTMF, ring, and Caller ID detection
Flow control and speed buffering
Automatic format/speed sensing
Asynchronous data
LED driver outputs
+5V to +3.3V voltage regulators on-chip
+3.3V to +1.2V voltage regulators on-chip
System compatibility – CDC-compliant systems
Microsoft Windows 98SE, Windows ME, Windows 2000 and Windows XP
operating systems; Linux operating systems
Macintosh computers and Sun workstations
Thin packages support low profile designs
CX93010-2x USB Modem in 20-pin QFN
CX20548 LSD in 16-pin QFN
Selectable 28.224 MHz or 27.000 MHz frequency of operation
+3.3V operation
Typical power use: 435 mW (operating)
1.2.2 SmartDAA Features
System side powered DAA operates under poor line current supply conditions
Ring detection
Line polarity reversal detection
Line current loss detection
Pulse dialing
Line-in-use detection during on-hook operation
Remote hang-up detection for efficient call termination
Extension pickup detection
Call waiting detection
Digital PBX line protection
Meets worldwide DC VI masks requirements
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1.2.3 Applications
V.92 modem USB adapters
Embedded systems
Gaming devices
Remote monitoring and data collection systems
1.3 Technical Overview
1.3.1 General Description
The UCMxx USB Device Set provides the processing core for a complete system design
featuring data/fax modem, and remote TAM.
Modem operation, including dialing, call progress, telephone line interface, TAM
interface, and host interface functions are supported and controlled through the V.250,
V.251, and V.253-compatible command set.
The modem hardware connects to the host PC via a USB connection. The OEM adds a
crystal circuit, serial EEPROM, telephone line interface, and other discrete components
as required by the modem model, and a Microsoft CDC-compliant modem driver to
complete the system.
The modem hardware connects to the host via a USB interface. The OEM adds a crystal
circuit, DIB components, telephone line interface, optional external serial EEPROM, and
other supporting discrete components as required by the application to complete the
system.
Customized modem firmware can be supported by the use of serial EEPROM (256 to
32 KB). To support country profile addition or modification, external serial EEPROM
(256 to 32 KB) can be installed. Customized code can include OEM-defined commands,
i.e., identification codes (I3), identifier string (I4), manufacturer identification (+GMI),
model identification (+GMM), and revision identification (+GMR), as well as code
modification.
1.3.2 Embedded MCU Firmware
Embedded MCU firmware performs processing of general modem control, command
sets, data modem, error correction and data compression (ECC), fax class 1, fax class 1.0,
fax class 2, voice/audio/TAM, worldwide, V.80, and USB host interface functions.
MCU firmware can be customized to include OEM-defined commands, i.e., identification
codes (I3), identifier string (I4), manufacturer identification (+GMI), model identification
(+GMM), and revision identification (+GMR), as well as code modification.
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1.3.3 Operating Modes
1.3.3.1 Data/Fax Modes
Data modem modes perform complete handshake and data rate negotiations. Using
modem modulations to optimize modem configuration for line conditions, the modem
can connect at the highest data rate that the channel can support from 56 kbps down to
2400 bps with automatic fallback.
In V.92/V.90 data modem mode (V.92 model), the modem can receive data from a digital
source using a V.92-compatible central site modem at line speeds up to 56 kbps. With
PCM upstream enabled (V.92 only), data transmission supports sending data at line
speeds up to 48 kbps. When PCM upstream is disabled, data transmission supports
sending data at line speeds up to V.34 rates. This mode can fallback to full-duplex V.34
mode and to lower rates as dictated by line conditions.
The following modes are supported in V.92 models when connected to a V.92-
compatible server supporting the feature listed.
Quick connect: Allows quicker subsequent connections to a server by using stored
line parameters obtained during the initial connection.
Modem-on-Hold: Allows detection and reporting of incoming phone calls on the
PSTN with enabled Call Waiting. If the incoming call is accepted by the user, the
user has a pre-defined amount of time of holding the data connection for a brief
conversation. The data connection resumes upon incoming call termination.
PCM upstream: Boosts the upstream data rates. A maximum of 48 kbps is supported
when connected to a V.92 server that supports PCM upstream.
In V.34 data modem mode (V.92 model), the modem can operate in 2-wire, full-duplex,
asynchronous modes at line rates up to 33.6 kbps. Data modem modes perform complete
handshake and data rate negotiations. Using V.34 modulation to optimize modem
configuration for line conditions, the modem can connect at the highest data rate that the
channel can support from 33600 bps down to 2400 bps with automatic fallback.
Automode operation in V.34 is provided in accordance with PN3320 and in V.32bis in
accordance with PN2330. All tone and pattern detection functions required by the
applicable ITU or Bell standards are supported.
In V.32bis data modem mode, the modem can operate at line speeds up to 14.4 kbps.
In V.22bis fast connect data mode, the modem can connect at 2400 bps with a very short
training time, which is very efficient for small data transfers.
In fax modem mode, the modem can operate in 2-wire, half-duplex, synchronous modes
and can support Group 3 facsimile send and receive speeds of 14400, 12000, 9600, 7200,
4800, and 2400 bps. Fax data transmission and reception performed by the modem are
controlled and monitored through the EIA/TIA-578 Fax Class 1, T.31 Fax Class 1.0, or
Fax Class 2 command interface. Full HDLC formatting, zero insertion/deletion, and CRC
generation/checking are provided.
1.3.3.2 V.44 Data Compression
V.44 provides more efficient data compression than V.42bis that significantly decreases
the download time for the types of files associated with Internet use. This significant
improvement is most noticeable when browsing and searching the web since HTML text
files are highly compressible. (The improved performance amount varies both with the
actual format and with the content of individual pages and files.)
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1.3.3.3 Synchronous Access Mode (SAM) - Video Conferencing
V.80 Synchronous Access Mode between the modem and the host/DTE is provided for
host-controlled communication protocols, e.g., H.324 video conferencing applications.
Voice-call-first (VCF) before switching to a videophone call is also supported.
1.3.3.4 Worldwide Operation
The modem operates in TBR21-compliant and other countries. Country-dependent
modem parameters for functions such as dialing, carrier transmit level, calling tone, call
progress tone detection, answer tone detection, blacklisting, caller ID, and relay control
are programmable.
SmartDAA technology allows a single PCB design and single BOM to be homologated
worldwide. Advanced features such as extension pickup detection, remote hang-up
detection, line-in-use detection, and digital PBX detection are supported.
Country code IDs are defined by ITU-T T.35.
Internal ROM includes default profiles for 63 countries including TBR21-compliant
profiles. Additional country profiles can be stored in internal SRAM or external serial
EEPROM (request additional country profiles from a Conexant Sales Office). Duplicate
country profiles stored in internal SRAM or external serial EEPROM will override the
profiles in internal RAM firmware. The default countries supported are listed in
Table 1-2.
Table 1-2. Default Countries Supported
Country Country
Code
Call Waiting Tone
Detection (CW)
Supported
On-Hook Type 1
Caller ID (CID)
Supported
Off-Hook Type 2
Caller ID (CID2)
Supported
Argentina 7 X X
Australia 9 X X X
Austria 0A X X X
Belgium 0F X X
Brazil 16 X X
Bulgaria 1B X X
Canada 20 X X X
Chile 25 X X
China 26 X X X
Colombia 27 X X
Croatia FA X X
Cyprus 2D X X
Czech Republic 2E X X
Denmark 31 X X X
Egypt 36 X X
Estonia F9 X X
Finland 3C X X X
France 3D X X X
Germany 42 X X X
Greece 46 X X
Hong Kong 50 X X X
Hungary 51 X X
Iceland 52 X X
India 53 X X X
Indonesia 54 X X
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Table 1-2. Default Countries Supported (Continued)
Country Country
Code
Call Waiting Tone
Detection (CW)
Supported
On-Hook Type 1
Caller ID (CID)
Supported
Off-Hook Type 2
Caller ID (CID2)
Supported
Ireland 57 X X X
Israel 58 X X
Italy 59 X X X
Japan 00 X X X
Korea 61 X X X
Kuwait 62 X X
Lebanon 64 X X
Luxembourg 69 X X
Malaysia 6C X X
Mexico 73 X X
Morocco 77 X X
Netherlands 7B X X X
New Zealand 7E X X X
Norway 82 X X X
Pakistan 84 X X
Philippines 89 X X
Poland 8A X X
Portugal 8B X X
Romania 8E X X
Russia B8 X X
Saudi Arabia 98 X X
Senegal 99 X X
Singapore 9C X X X
Slovakia FB X X
Slovenia FC X X
South Africa 9F X X
Spain A0 X X X
Sri Lanka A1 X X
Sweden A5 X X X
Switzerland A6 X X
Taiwan FE X X X
Thailand A9 X X
Tunisia AD X X
Turkey AE X X
UK B4 X X X
United Arab Emirates B3 X X
Uruguay B7 X X
USA B5 X X X
Reserved FD
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1.3.3.5 TAM Mode
TAM Mode features include 2-bit/4-bit ADPCM, 4-bit IMA ADPCM, 8-bit and 16-bit
linear PCM, and 8-bit -law and A-law PCM coding at 8 kHz sample rate. Tone
detection/ generation, call discrimination, and concurrent DTMF detection are also
supported.
TAM Mode is supported by four submodes:
Online Voice Command Mode supports connection to the telephone line.
Voice Receive Mode supports recording voice or audio data input from the telephone
line.
Voice Transmit Mode supports playback of voice or audio data to the telephone line.
Full-duplex Receive and Transmit Mode.
1.3.4 Reference Designs
Data/fax/TAM reference design for an external modem is available to minimize
application design time, reduce development cost, and accelerate market entry. The part
number for this design is: CZ-9Z-NR0226.
A design package is available in electronic form. This package includes schematics, bill
of materials (BOM), vendor part list (VPL), board layout files in Gerber format, and
complete documentation.
1.4 Hardware Description
SmartDAA technology eliminates the need for a costly analog transformer, relays, and
opto-isolators that are typically used in discrete DAA implementations. The
programmable SmartDAA architecture simplifies product implementation in worldwide
markets by eliminating the need for country-specific components.
1.4.1 CX93010-2x UCMxx USB Modem
The CX93010-2x UCMxx USB Modem, packaged in a 20-pin QFN, includes a USB
interface, Microcontroller (MCU) (controllered modem only), a Modem Data Pump
(MDP), 256 KB internal ROM, 20 KB internal RAM, and SmartDAA interface functions.
The UCMxx USB Modem performs the command processing and host interface
functions. The crystal frequency is 28.224 or 27.000 MHz.
The UCMxx USB Modem optionally connects to an external OEM-supplied serial
EEPROM over a dedicated 2-line serial interface. The capacity of the EEPROM can be
256 bytes up to 32 KB. The EEPROM can hold information such as firmware
configuration customization, country code parameters, and cellular drivers.
The UCMxx USB Modem performs telephone line signal modulation/demodulation in a
hardware digital signal processor (DSP) which reduces computational load on the host
processor.
The SmartDAA 4 Interface communicates with, and supplies power and clock to, the
LSD through the DIB.
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1.4.2 Digital Isolation Barrier
The OEM-supplied Digital Isolation Barrier (DIB) electrically DC isolates the UCMxx
USB Modem from the LSD and telephone line. The UCMxx USB Modem is connected
to a fixed digital ground and operates with standard CMOS logic levels. The LSD is
connected to a floating ground and can tolerate high voltage input (compatible with
telephone line and typical surge requirements).
The DIB transformer couples power, clock, and data from the UCMxx USB Modem to
the LSD over two lines.
The DIB data channel supports bidirectional half-duplex serial transfer of data, control,
and status information.
1.4.3 CX20548 SmartDAA 4 Line Side Device
The CX20548 SmartDAA 4 Line Side Device (LSD) includes a Line Side DIB Interface,
a coder/decoder (codec), and a Telephone Line Interface (TLI).
The Line Side DIB Interface communicates with, and receives power and clock from, the
SmartDAA 4 interface in the host side device (HSD) through the DIB transformer. The
clock signal passing through the transformer is rectified in the LSD and filtered using
external capacitors.
Information is transferred between the LSD and the HSD through the DIB transformer
using pulse width modulation
The TLI integrates DAA and direct telephone line interface functions and connects
directly to the line TIP and RING pins, as well as to external line protection components.
Direct LSD connection to TIP and RING allows real-time measurement of telephone line
parameters, such as the telephone central office (CO) battery voltage, individual
telephone line (copper wire) resistance, and allows dynamic regulation of the off-hook
TIP and RING voltage and total current drawn from the central office (CO). This allows
the modem to maintain compliance with U.S. and worldwide regulations.
1.5 Commands
The modem supports data modem, fax class 1, 1.0, or 2 modem, TAM, V.80 commands,
and S Registers in accordance with modem model options. See Doc. REM-201692 for a
description of the commands.
Data Mode Operation. Data functions operate in response to the AT commands when
+FCLASS=0. Default parameters support U.S./Canada operation.
Fax Mode Operation. Facsimile functions operate in response to fax class 1 commands
when +FCLASS=1, to fax class 1.0 commands when +FCLASS=1.0, or to fax class 2
commands when +FCLASS=2.
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2. Technical Specifications
2.1 USB Interface Operation
See Chapter 6.
2.2 Establishing Data Modem Connections
2.2.1 Telephone Number Directory
The modem supports four telephone number entries in a directory that can be saved in an
optional serial NVRAM. Each telephone number can be up to 32 characters (including
the command line terminating carriage return) in length. A telephone number can be
saved using the &Zn=x command, and a saved telephone number can be dialed using the
DS=n command.
2.2.2 Dialing
DTMF Dialing. DTMF dialing using DTMF tone pairs is supported in accordance with
ITU-T Q.23. The transmit tone level complies with Bell Publication 47001.
Pulse Dialing. Pulse dialing is supported in accordance with EIA/TIA-496-A.
Blind Dialing. The modem can blind dial in the absence of a dial tone if enabled by the
X0, X1, or X3 command.
2.2.3 Modem Handshaking Protocol
If a tone is not detected within the time specified in the S7 register after the last digit is
dialed, the modem aborts the call attempt.
2.2.4 Call Progress Tone Detection
Ringback, equipment busy, congested tone, warble tone, and progress tones can be
detected in accordance with the applicable standard.
2.2.5 Answer Tone Detection
Answer tone can be detected over the frequency range of 2100 ± 40 Hz in ITU-T modes
and 2225 ± 40 Hz in Bell modes.
2.2.6 Ring Detection
A ring signal can be detected from a TTL-compatible 15.3 Hz to 68 Hz square wave
input.
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2.2.7 Billing Protection
When the modem goes off-hook to answer an incoming call, both transmission and
reception of data are prevented for 2 seconds (data modem) or 4 seconds (fax adaptive
answer) to allow transmission of the billing tone signal.
2.2.8 Connection Speeds
The modem functions as a data modem when the +FCLASS=0 command is active.
Line connection can be selected using the +MS command. The +MS command selects
modulation, enables/disables automode, and selects minimum and maximum line speeds
(Table 2-1).
2.2.9 Automode
Automode detection can be enabled by the +MS command to allow the modem to
connect to a remote modem in accordance with draft PN-3320 for V.34 (Table 2-1).
Table 2-1. +MS Command Automode Connectivity
Modulation <carrier> Possible (<min_rx_rate>, <min_rx_rate>, (<min_tx_rate>),
and <max_tx_rate>) Rates (bps)
Bell 103 B103 300
Bell 212 B212 1200 Rx/75 Tx or 75 Rx/1200 Tx
V.21 V21 300
V.22 V22 1200
V.22bis V22B 2400 or 1200
V.23 V23C 1200
V.32 V32 9600 or 4800
V.32bis V32B 14400, 12000, 9600, 7200, or 4800
V.34/V.90 upstream1 V34/V90 33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800,
14400, 12000, 9600, 7200, 4800, or 2400
V.90 downstream1 V90 56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,
45333, 44000, 42667, 41333, 40000, 38667, 37333, 36000,
34667, 33333, 32000, 30667, 29333, 28000
V.92 downstream1 V92 56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,
45333, 44000, 42667, 41333, 40000, 38667, 37333, 36000,
34667, 33333, 32000, 30667, 29333, 28000
V.92 upstream1 V92 48000, 46667, 45333, 44000, 42667, 41333, 40000, 38667,
37333, 36000, 34667, 33333, 32000, 30667, 29333, 28000,
26667, 25333, 24000
Notes:
1. V.92 model.
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2.3 Data Mode
Data mode exists when a telephone line connection has been established between
modems and all handshaking has been completed.
2.3.1 Speed Buffering (Normal Mode)
Speed buffering allows a DTE to send data to, and receive data from, a modem at a speed
different than the line speed. The modem supports speed buffering at all line speeds.
2.3.2 Flow Control
DTE-to-Modem Flow Control. If the modem-to-line speed is less than the DTE-to-
modem speed, the modem supports XOFF/XON or RTS/CTS flow control with the DTE
to ensure data integrity.
2.3.3 Escape Sequence Detection
The +++ escape sequence can be used to return control to the command mode from the
data mode. Escape sequence detection is disabled by an S2 Register value greater than
127.
2.3.4 BREAK Detection
The modem can detect a BREAK signal from either the DTE or the remote modem. The
\Kn command determines the modem response to a received BREAK signal.
2.3.5 Telephone Line Monitoring
GSTN Cleardown (V.90, V.34, V.32bis, V.32). Upon receiving GSTN Cleardown from
the remote modem in a non-error correcting mode, the modem cleanly terminates the call.
Loss of Carrier (V.22bis and Below). If carrier is lost for a time greater than specified
by the S10 register, the modem disconnects (except MNP 10).
2.3.6 Fall Forward/Fallback (V.92/V.90/V.34/V.32bis/V.32)
During initial handshake, the modem will fallback to the optimal line connection within
V.92/V.90/V.34/V.32bis/V.32 mode depending upon signal quality if automode is
enabled by the +MS or N1 command.
When connected in V.92/V.90/V.34/V.32bis/V.32 mode, the modem will fall forward or
fallback to the optimal line speed within the current modulation depending upon signal
quality if fall forward/fallback is enabled by the %E2 command.
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2.3.7 Retrain
The modem may lose synchronization with the received line signal under poor or
changing line conditions. If this occurs, retraining may be initiated to attempt recovery
depending on the type of connection.
The modem initiates a retrain if line quality becomes unacceptable if enabled by the %E
command. The modem continues to retrain until an acceptable connection is achieved, or
until 30 seconds elapse resulting in line disconnect.
2.3.8 Programmable Inactivity Timer
The modem disconnects from the line if data is not sent or received for a specified length
of time. In normal or error-correction mode, this inactivity timer is reset when data is
received from either the DTE or from the line. This timer can be set to a value between 0
and 255 seconds by using register S30. A value of 0 disables the inactivity timer.
2.4 V.92 Features (V.92 Model)
Modem-on-Hold, quick connect, and PCM upstream are only available in V.92 models
when connecting in V.92 data mode. V.92 features are only available when the server
called is a V.92 server that supports that particular feature.
2.4.1 Modem-on-Hold
The Modem-on-Hold (MOH) function enables the modem to place a data call to the
Internet on hold while using the same line to accept an incoming or place an outgoing
voice call. This feature is available only with a connection to a server supporting MOH.
MOH can be executed through either of two methods:
One method is to enable MOH through the +PMH command. With Call Waiting
Detection (+PCW command) enabled, an incoming call can be detected while on-
line. Using a string of commands, the modem negotiates with the server to place the
data connection on hold while the line is released so that it can be used to conduct a
voice call. Once the voice call is completed, the modem can quickly renegotiate with
the server back to the original data call.
An alternative method is to use communications software that utilizes the Conexant
Modem-on-Hold drivers under Windows PC operating systems. Using this method,
the software can detect an incoming call, place the data connection on hold, and
switch back to a data connection.
2.4.2 Quick Connect
The quick connect function enables the modem to shorten the connect time of subsequent
calls to a server supporting quick connect. The quick connect feature is supported by the
+PQC command.
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2.4.3 PCM Upstream
PCM upstream boosts the upstream data rates between the user and ISP to reduce upload
times for large files and email attachments. A maximum of 48 kbps upstream rate is
supported with PCM upstream enabled, in contrast to a maximum of 31.2 kbps upstream
rate with PCM upstream not enabled. PCM upstream is supported by the +PCM
command. PCM upstream is disabled by default.
2.5 Error Correction and Data Compression
2.5.1 V.42 Error Correction
V.42 supports two methods of error correction: LAPM and, as a fallback, MNP 4. The
modem provides a detection and negotiation technique for determining and establishing
the best method of error correction between two modems.
2.5.2 MNP 2-4 Error Correction
MNP 2-4 is a data link protocol that uses error correction algorithms to ensure data
integrity. Supporting stream mode, the modem sends data frames in varying lengths
depending on the amount of time between characters coming from the DTE.
2.5.3 V.44 Data Compression
V.44 data compression encodes pages and files associated with Web pages more
efficiently than V.42bis. These files include WEB pages, graphics and image files, and
document files. V.44 can provide an effective data throughput rate up to DTE rate for a
56-kbps connection. The improved performance amount varies both with the actual
format and with the content of individual pages and files.
2.5.4 V.42bis Data Compression
V.42bis data compression mode, enabled by the %Cn command or S46 register, operates
when a LAPM or MNP 10 connection is established.
The V.42bis data compression employs a “string learning” algorithm in which a string of
characters from the DTE is encoded as a fixed length codeword. Two 2-KB dictionaries
are used to store the strings. These dictionaries are dynamically updated during normal
operation.
2.5.5 MNP 5 Data Compression
MNP 5 data compression mode, enabled by the %Cn command, operates during an MNP
connection.
In MNP 5, the modem increases its throughput by compressing data into tokens before
transmitting it to the remote modem, and by decompressing encoded received data before
sending it to the DTE.
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2.6 Telephony Extensions
The following telephony extension features are supported and can be typically be
implemented in designs for software applications to enhance end-user experience:
Line In Use detection
Extension Pickup detection
Remote Hang-up detection
The telephony extension features are enabled through the -STE command. The -TTE
command can be used to adjust the voltage thresholds for the telephony extension
features.
2.6.1 Line In Use Detection
The Line In Use Detection feature can stop the modem from disturbing the phone line
when the line is already being used. When an automated system tries to dial using ATDT
and the phone line is in use, the modem will not go off hook and will respond with the
message “LINE IN USE”.
2.6.2 Extension Pickup Detection
The Extension Pickup Detection feature (also commonly referred as PPD or Parallel
phone detection) allows the modem to detect when another telephony device (i.e., fax
machine, phone, satellite/cable box) is attempting to use the phone line.
This feature can also be used in Telephone Answering Machine applications (TAM). Its
main use would be to stop the TAM operation when a phone is picked up.
2.6.3 Remote Hangup Detection
The Remote Hangup Detection feature will cause the modem go back on-hook during a
data connection when the remote modem is disconnected for abnormal termination
reasons (remote phone line unplugged, remote server/modem shutdown.
2.7 Fax Class 1, Fax Class 1.0, and Fax Class 2 Operation
Facsimile functions operate in response to fax class 1 commands when +FCLASS=1, to
fax class 1.0 commands when +FCLASS=1.0, or to fax class 2 commands when
+FCLASS=2.
In the fax mode, the on-line behavior of the modem is different from the data (non-fax)
mode. After dialing, modem operation is controlled by fax commands. Some AT
commands are still valid but may operate differently than in data modem mode.
Calling tone is generated in accordance with T.30.
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2.8 Caller ID
Both Type I Caller ID (On-Hook Caller ID) and Type II Caller ID (Call Waiting Caller
ID) are supported for U.S. and many other countries (see Section 2.9). Both types of
Caller ID are enabled/disabled using the +VCID command. Call Waiting Tone detection
must be enabled using the +PCW command to detect and decode Call Waiting Caller ID.
When enabled, caller ID information (date, time, caller code, and name) can be passed to
the DTE in formatted or unformatted form. Inquiry support allows the current caller ID
mode and mode capabilities of the modem to be retrieved from the modem.
Type II Caller ID (Call Waiting Caller ID) detection operates only during data mode in
V.92, V.90, V.34, V.32bis, or V.32.
2.9 Worldwide Country Support
Internal modem firmware supports 63 country profiles (see Section 1.3.3.4). These
country profiles include the following country-dependent parameters:
Dial tone detection levels and frequency ranges.
DTMF dialing parameters: Transmit output level, DTMF signal duration, and DTMF
interdigit interval.
Pulse dialing parameters: Make/break times, set/clear times, and dial codes are
programmable
Ring detection frequency range.
Type I and Type II Caller ID detection are supported for many countries. Contact
your local Conexant sales office for additional country support.
Blind dialing enabled/disable.
Carrier transmit level (through S91 for data and S92 for fax). The maximum,
minimum, and default values can be defined to match specific country and DAA
requirements.
Calling tone is generated in accordance with V.25. Calling tone may be toggled
(enabled/disabled) by inclusion of a “^” character in a dial string. It may also be
disabled.
Frequency and cadence of tones for busy, ringback, congested, warble, dial tone 1,
and dial tone 2.
Answer tone detection period.
Blacklist parameters. The modem can operate in accordance with requirements of
individual countries to prevent misuse of the network by limiting repeated calls to
the same number when previous call attempts have failed. Call failure can be
detected for reasons such as no dial tone, number busy, no answer, no ringback
detected, voice (rather than modem) detected, and key abort (dial attempt aborted by
user). Actions resulting from such failures can include specification of minimum
inter-call delay, extended delay between calls, and maximum numbers of retries
before the number is permanently forbidden ("blacklisted").
These country profiles may be altered or customized by modifying the country-
dependent parameters. Additional profiles may also be included.
Please contact an FAE at the local Conexant sales office if a country code customization
is required.
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2.10 Diagnostics
2.10.1 Commanded Tests
Diagnostics are performed in response to &T commands.
Analog Loopback (&T1 Command). Data from the local DTE is sent to the modem,
which loops the data back to the local DTE.
PTT Signal Generation (%TTn Command). Continuous tones or modulation are
generated by the DSP and output through the DAA.
2.11 Low Power Stop Mode
Stop Mode. The modem enters the low power stop mode when no line connection exists
and no host activity occurs for the period of time specified in the USB specification. All
modem circuits are turned off in order to reduce consumed power while being able to
immediately wake up and resume normal operation.
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3. Hardware Interface
3.1 CX93010-2x UCMxx USB Modem Hardware Pins and Signals
3.1.1 General
3.1.1.1 USB Interface
Differential data plus and data minus signals (USB_DP and USB_DN) interface to the
USB port.
3.1.1.2 LED Interface
Dedicated LED output signals are provided for Transmit/Receive Data and Off-Hook
status.
3.1.1.3 LSD Interface (Through DIB)
The DIB interface signals are:
DIBP
DIBN
3.1.1.4 Call Progress Speaker Interface
The call progress speaker interface signal is:
Digital speaker output (DSPKOUT); output
DSPKOUT is a square wave output in Data/Fax mode used for call progress or carrier
monitoring. This output can be optionally connected to a low-cost on-board speaker, e.g.,
a sounducer, or to an analog speaker circuit.
3.1.1.5 Serial EEPROM Interface
A 2-line serial interface to an optional serial EEPROM is supported. The interface signals
are:
Bidirectional Data input/output (NVMDATA)
Clock output (NVMCLK)
The EEPROM can hold information such as firmware customization and country code
parameters. Data stored in EEPROM takes precedence over the factory default settings.
The EEPROM size can range from 2 Kb (256 x 8) to 256 Kb (32K x 8) and must support
a clock frequency of at least 400 kHz. For overriding, adding new country profiles, or
loading NVRAM patches, the EEPROM size must be larger than 2Kb. The size of the
EEPROM device will depend on the number of country profiles added or patch size.
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The serial EEPROM is required to store the USB device, configuration, interface, and
endpoint descriptors. Device descriptors include Vendor ID, Product ID, Device Release
Number, Manufacturer Name, Product Name, and Serial Number.
Connection to an Atmel AT24C04N-10-2.7 or equivalent is supported.
3.1.2 CX93010-2x Signal Interface, Pin Assignments, and Signal Definitions
CX93010-2x Modem hardware interface signals are shown by major interface in
Figure 3-1, are shown by pin number in Figure 3-2, and are listed by pin number in
Table 3-1.
The CX93010-2x Modem hardware interface signals are defined in Table 3-2.
Figure 3-1. CX93010-2x UCMxx USB Modem Hardware Signals
CX93010-2x
Modem
20-Pin QFN
XTLI
XTLO
RESET#
RINGD
USB_RES
USB_DP
USB_DN
LED_DATA
LED_OH
NVMCLK/CLKSEL
NVMDATA
LPO
18
19
20
2
1
6
7
5
9
4
12
14
RESET CIRCUIT
IRING_N
RES
DP
DN
LED_DCD
LED_OH
DIBN
DIBP
DSPKOUT
VDD_CORE
VDD
VCC
VCC
GND
PADDLE (GND)
10
11
17
15
8
3
13
16
21
DIGITAL ISOLATION
BARRIER (DIB)
SPEAKER CIRCUIT
+3.3V
240K
+3.3V DECOUPLING
28.224 OR 27.000 MHZ
CRYSTAL OR CLOCK OSCILLATOR
FREQUENCY SELECT CIRCUIT
SERIAL EEPROM
+1.2V DECOUPLING
+5V (USB_VCC)
NOTE:
PADDLE (GND), indicated as Pin 21, is a conductive surface on the bottom of the device and must be
connected to system side digital ground.
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
DSH-201723C Conexant Proprietary and Confidential Information 3-3
Figure 3-2. CX93010-2x UCMxx USB Modem 20-Pin QFN Pin Signals
CX93010-2x
VDD_CORE
LPO
VCC
NVMDATA
DIBP
15
14
13
12
11
USB_RES
RINGD
VCC
NVMCLK/CLKSEL
LED_DATA
1
2
3
4
5
USB_DP
USB_DN
VDD
LED_OH
DIBN
6
7
8
9
10
RESET#
XTLO
XTLI
DSPKOUT
GND
20
19
18
17
16
NOTE:
PADDLE (GND) is a conductive surface on the bottom of the
device and is indicated as pin 21.
Table 3-1. CX93010-2x UCMxx USB Modem 20-Pin QFN Pin Signals
Pin No. Signal Name Pin No. Signal Name
1 USB_RES 11 DIBP
2 RINGD 12 NVMDATA
3 VCC 13 VCC
4 NVMCLK/CLKSEL 14 LPO
5 LED_DATA 15 VDD_CORE
6 USB_DP 16 GND
7 USB_DN 17 DSPKOUT
8 VDD 18 XTLI
9 LED_OH 19 XTLO
10 DIBN 20 RESET#
21 PADDLE (GND)
Note:
PADDLE (GND) is a conductive surface on the bottom of the device and is indicated as pin 21.
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
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Table 3-2. CX93010-2x UCMxx USB Modem Pin Signal Definitions
Label Pin I/O I/O Type Signal Name/Description
System
XTLI
XTLO
18
19
I
O
Ix
Ox
Crystal In and Crystal Out. If an external 27 or 28.224 MHz
crystal circuit is used instead of an external clock circuit,
connect XTLI and XTLO to the external crystal circuit. When an
external clock circuit is used, connect the clock signal to XTLI
and leave XTLO open.
RESET# 20 I Ipu/It Reset. The active low RESET# input resets the CX93010-2x
logic, and restores the saved configuration from serial
EEPROM or returns the modem to the factory default values if
NVRAM is not present.
RESET# low holds the modem in the reset state; RESET#
going high releases the modem from the reset state. After
application of VDD, RESET# must be held low for at least 15
ms after the VDD power reaches operating range. The modem
device set is ready to use 25 ms after the low-to-high transition
of RESET#.
Connect RESET# input to the CX93010-2x XRESET_N pin
through 51 .
VCC 3, 13 P PWR Digital Supply Voltage. Connect to USB VCC (+5V, filtered).
VDD 8 P PWR +3.3 Internal I/O Voltage Filter. Connect to +3.3V decoupling
capacitors only.
VDD_CORE 15 P PWR +1.2 Internal Core Voltage Filter. Connect to +1.2V
decoupling capacitors only.
GND 16 G GND Digital Ground. Connect to digital ground (GND).
PADDLE (GND) 21 G GND Paddle Ground. Connect to digital ground (GND).
LPO 14 I I/O
Low Power Oscillator. Connect to +3.3V through 240 K.
Serial EEPROM (NVRAM) Interface
NVMCLK/CLKSEL 4 I/O Ipu/O2 NVRAM Clock (NVMCLK). NVMCLK output high enables the
EEPROM. Connect to EEPROM SCL pin. This signal is
multiplexed with the CLKSEL signal.
Clock Frequency Select (CLKSEL). Clock frequency is
selected by CLKSEL during reset processing. Leave open for
28.224 MHz operation; connect pin to digital ground (GND)
through 10 k for 27.000 MHz operation. This signal is
multiplexed with the NVMCLK signal.
NVMDATA 12 I/O Ipu/O2 NVRAM Data. The NVMDATA pin supplies a serial data
interface to the EEPROM. Connect to EEPROM SDA pin and to
+3.3V through 10 K.
LED Interface
LED_OH 9 O Ipu/O8 Off-Hook Indicator. Active low. Connect to LED circuit.
LED_DATA 5 O Ipu/O8 Data Indicator. Active low. Connect to LED circuit.
USB Interface
USB_DP
USB_DN
6
7
I/O
I/O
I/O
I/O
USB Port. USB_DP and USB_DN are the differential data plus
and data minus signals of the USB port, the upstream
differential port. These lines do not have internal pullup
resistors. Connect DP and DM to USB_DATAP and
USB_DATAM, respectively, through 43 . Connect USB_DM to
GND through a 5.1 M resistor. Connect USB_DM to GND
through a 5.1 M resistor.
USB_RES 1 I Ipd/It
Reset. Connect to USB_DATAP through 1.5 K.
Wake-on-Ring Circuit Interface
RINGD 2 I Ipd/It Ring Wakeup. Active high input that indicates that a ring has
been detected to wake up the UID from suspend mode.
Connect to Suspend/Resume and Wake-on-Ring circuit.
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
DSH-201723C Conexant Proprietary and Confidential Information 3-5
Table 3-2. CX93010-2x UCMxx USB Modem Pin Signal Definitions (Continued)
Label Pin I/O I/O Type Signal Name/Description
DIB Interface
DIBN 10 I/O Odpc DIB Negative. Provides clock and power to the LSD, and
transfers data, control and status information between the SSD
and LSD. Connect to DIB transformer primary winding terminal.
DIBP 11 I/O Odpc DIB Positive. Provides clock and power to the LSD and
transfers data, control and status information between the SSD
and LSD. Connect to DIB transformer primary winding terminal.
Speaker Interface
DSPKOUT 17 O Ipd/O2 Modem Speaker Digital Output. The DSPKOUT digital output
reflects the received analog input signal digitized to TTL high or
low level by an internal comparator. Typically, connect to a
digital call progress speaker circuit.
Notes:
1. I/O Types: See Table 3-4.
2. Interface Legend:
DIB Digital Isolation Barrier
NC No internal pin connection
RESERVED = No external connection allowed (may have internal connection).
Table 3-3. CX93010-2x UCMxx USB Modem I/O Type Definitions
I/O Type Description
Ix/Ox I/O, wire
It/O2 Digital input, +3.3V tolerant/ Digital output, 2 mA
Itpd/It Digital input, +3.3V tolerant, 120 k pull down/ Digital input
Itpd/O2 Digital input, +3.3V tolerant, 120 k pull down/ Digital output, 2 mA
Itpu/It Digital input, +3.3V tolerant, 120 k pull up/ Digital input
Itpu/O2 Digital input, +3.3V tolerant, 120 k pull up/ Digital output, 2 mA
Itpu/O8 Digital input, +3.3V tolerant, 120 k pull up/ Digital output, 8 mA
Odpc Digital output with adjustable drive, DIB clock and power
PWR Power
GND Ground
NOTES:
1. See DC characteristics in Table 3-4.
2. I/O Type corresponds to the device Pad Type. The I/O column in signal interface tables refers to signal I/O direction used in
the application.
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
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Table 3-4. CX93010-2x UCMxx USB Modem DC Electrical Characteristics
Parameter Symbol Min. Typ. Max. Units Test Conditions
Input Voltage Low VIL
+3.3V tolerant 0 – 0.8 V
+3.3V tolerant
hysteresis
0 – 0.3 *VDD V
Input Voltage High VIH – V
+3.3V tolerant 2 – 3.6 V
+3.3V tolerant
hysteresis
0.7 * VDD – 3.6 V
Input Hysteresis VH – V
+3V hysteresis 0.5 – V
+3.3V tolerant,
hysteresis
0.3 – V
Output Voltage Low VOL
Z
INT = 120 0 – 0.4 V IOL = 2 mA
Z
INT = 50 0 – 0.4 V IOL = 8 mA
Output Voltage High VOH – V
Z
INT = 120 2.4 – VDD V IOL = -2 mA
Z
INT = 50 2.4 – VDD V IOL = -8 mA
Pull-Up Resistance Rpu 120 – 500 k
Pull-Down Resistance Rpd 120 – 500 k
Test Conditions unless otherwise stated: VCC = +5 ± 0.25 VDC; TA = 0°C to 70°C; external load = 50 pF.
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
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3.2 CX20548 LSD Hardware Pins and Signals
3.2.1 General
3.2.1.1 Host Side Device (HSD) Interface (Through DIB)
The DIB interface signals are:
DIB Positive (DIBP, pin 14); input/output
DIB Negative (DIBN, pin 16); input/output
3.2.1.2 Power and Ground
The power and ground signals are:
Unregulated Power Output (PWR, pin 15)
Regulated Digital Power Output (DVDD, pin 1)
Regulated Analog Power Output (AVDD, pin 2)
Analog Ground (PADDLE [AGND]); Analog ground
3.2.1.3 Telephone Line Interface
The telephone line interface signals are:
RING AC Coupled (RAC, pin 4); input
TIP AC Coupled (TAC, pin 5); input
Electronic Inductor Capacitor (EIC, pin 11)
Electronic Inductor Output (EIO, pin 10)
Electronic Inductor Feedback (EIF, pin 9)
Receive Analog Input (RXI, pin 6); input
Transmit Output (TXO, pin 8); output
Transmit Feedback (TXF, pin 7); input
3.2.1.4 Voltage References
There is one reference voltage pin:
Output Middle (Center) Reference Voltage (VC, pin 3); output for decoupling
3.2.1.5 General Purpose Input/Output
There is one unassigned general purpose input/output pin:
General Purpose Input/Output (GPIO, pin 13); input/output
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
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3.2.2 Pin Assignments and Signal Definitions
CX20548 LSD hardware interface signals are shown by major interface in Figure 3-3, are
shown by pin number in Figure 3-4, and are listed by pin number in Table 3-5.
Note: Pin 17 is shown in Figure 3-3 to ensure that the PADDLE is considered when
laying out the printed circuit board. The PADDLE is the analog ground pin of
the CX20548 device and must be connected to LSD analog ground
(AGND_LSD) when the CX20548 is populated in a PCB.
CX20548 LSD hardware interface signals are defined in Table 3-6.
CX20548 LSD GPIO DC characteristics are specified in Table 3-7.
CX20548 LSD AVDD DC characteristics are specified in Table 3-8.
Figure 3-3. CX20548 LSD Hardware Interface Signals
RAC
TAC
EIC
EIO
EIF
RXI
TXO
TXF
VC
GPIO
4
5
11
10
9
6
8
7
3
13
CX20548
SmartDAA 4
Line Side
Device
(LSD)
16-Pin QFN
Electronic
Inductor, Off-
Hook, Pulse
Dial, and TIP
and RING VI
Control
AGND_LSD
Safety
and EMI
Protection
AGND_LSD
C844
Receive
Coupling
Impedance
Matching
and
Transmitter
NC
DIBN
DIBP
TEST
DVDD
PWR+
AVDD
PADDLE (AGND)
16
14
2
1
15
2
17
C828
AGND_LSD
DIGITAL
ISOLATION
BARRIER
(DIB)
DIBN
DIBP
Telephone
Line
Connector
TIP
RING
C852
C850
NOTES:
1. Consult applicable reference design for exact component
placement and values, and for layout guidelines.
2. The PADDLE (indicated as Pin 17) is the analog ground pin of the
CX20548 device and must be connected to LSD analog ground (AGND_LSD)
when the CX20548 is populated in a printed circuit board (PCB).
C862
C870
AGND_LSD
AGND_LSD
R802
R804
R854
AGND_LSD
C830
T802
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
DSH-201723C Conexant Proprietary and Confidential Information 3-9
Figure 3-4. CX20548 LSD 16-Pin QFN Pin Signals
Table 3-5. CX20548 LSD 16-Pin QFN Pin Signals
Pin Signal Label Pin Signal Label
1 DVDD 9 EIF
2 AVDD 10 EIO
3 VC 11 EIC
4 RAC 12 TEST
5 TAC 13 GPIO
6 RXI 14 DIBP
7 TXF 15 PWR
8 TXO 16 DIBN
17 PADDLE (AGND)
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
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Table 3-6. CX20548 LSD Hardware Signal Definitions
Label Pin I/O I/O Type Signal Name/Description
System Interface Signals
PWR 15 PWR PWR Unregulated Power Output. Unregulated power output from the internal
rectifier, connect to AGND_LSD through C870.
VC 3 REF REF Output Middle Reference Voltage. Connect to AGND_LSD through
C844, which must be placed close to pin 3. Use a short path and a wide
trace to AGND_LSD pin.
AVDD 2 PWR PWR Analog Power Output. Provides external connection point for
decoupling. (AVDD is routed internally to LSD analog circuits.). Connect
to AGND_LSD through C828. C828 must be placed close to pins 2.
DVDD 1 PWR PWR Digital Power Output. Provides external connection point for
decoupling. Connect to AGND_LSD through C830. Place C830 near
pin 1.
PADDLE
(AGND)
17 AGND_LSD AGND_LSD
Paddle Analog Ground. The conductive surface located on the bottom
of the package and referred to as pin 17 is connected internally to device
analog ground. Connect to AGND_LSD.
DIB Interface Signals
DIBP 14 I/O I/O DIB Positive. Positive terminal of DIB, connect to secondary of DIB
transformer.
DIBN 16 I/O I/O DIB Negative. Negative terminal of DIB, connect to secondary of DIB
transformer.
TIP and RING Interface Signals
RAC
TAC
4
5
I
I
Ia
a
RING AC Coupled and TIP AC Coupled. Un-rectified voltage from
telephone line used to detect ring.
Connect RAC to the diode bridge AC node (RING) through R802
(connects to pin 4).
Connect TAC to the diode bridge AC node (TIP) through R804 (connects
to pin 5).
EIC 11 O Oa Electronic Inductor Capacitor. Electronic inductor filtering capacitor.
Connect to AGND_LSD through C858.
EIO 10 O Oa Electronic Inductor Output. Calculated voltage is applied to this output
to control off-hook and DC VI mask operation. Connect to base of Q804.
EIF 9 I Ia Electronic Inductor Feedback. Connect to emitter of Q804 through
R826.
RXI 6 I Ia Receive Analog Input. Receiver operational amplifier inverting input.
AC coupled to the Bridge_CC node through R810 (connects to pin 6)
and C810 in series. R810 and C810 must be placed very close to pin 6.
The length of the PCB trace connecting R810 to the RXI pin must be
kept at an absolute minimum.
TXO 8 O Oa Transmit Output. Outputs transmit signal and impedance matching
signal; connect to base of transistor Q802.
TXF 7 I Ia Transmit Feedback. Connect to emitter of transistor Q802.
Not Used
GPIO 1 I/O It/Ot12 General Purpose I/O. Leave open if not used.
Notes:
1. I/O types*:
Ia Analog input
It Digital input*
Oa Analog output
Ot12 Digital output*
AGND_LSD Isolated LSD Analog Ground (isolated from the host system ground)
*See Section CX20548 LSD GPIO DC Electrical Characteristics (Table 3-7).
2. Refer to applicable reference design for exact component placement and values.
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
DSH-201723C Conexant Proprietary and Confidential Information 3-11
Table 3-7. CX20548 LSD GPIO DC Electrical Characteristics
Parameter Symbol Min. Typ. Max. Units Test Conditions
Input Voltage VIN -0.30 – 3.465 V DVDD = +3.465V
Input Voltage Low VIL – – 1.0 V
Input Voltage High VIH 1.6 – – V
Output Voltage Low VOL 0 – 0.33 V
Output Voltage High VOH 2.97 – – V
Input Leakage Current – -10 – 10 µA
Output Leakage Current (High Impedance) – -10 – 10 µA
GPIO Output Sink Current at 0.33 V maximum – 2.4 – - mA
GPIO Output Source Current at 2.97 V
minimum
– 2.4 – - mA
GPIO Rise Time/Fall Time 20 100 ns
Test Conditions unless otherwise stated: DVDD = +3.3V +5%; TA = 0°C to 70°C; external load = 50 pF
Table 3-8. CX20548 LSD AVDD and DVDD DC Electrical Characteristics
PWR Input AVDD Output DVDD Output
+3.3 V < PWR < +4.5 V +3.3 V 5% +3.0 V 5%
PWR must be at least 100mV higher than AVDD.
See PWR, AVDD, and DVDD descriptions in Table 3-6.
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
3-12 Conexant Proprietary and Confidential Information DSH-201723C
3.3 Electrical and Environmental Specifications
3.3.1 Operating Conditions, Absolute Maximum Ratings, and Power
Requirements
The operating conditions are specified in Table 3-9.
The absolute maximum ratings are listed in Table 3-10.
The current and power requirements are listed in Table 3-11.
Table 3-9. Operating Conditions
Parameter Symbol Limits Units
Supply Voltage VCC +4.75 to 5.25 VDC
Operating Ambient Temperature TA 0 to +70 °C
Table 3-10. Absolute Maximum Ratings
Parameter Symbol Limits Units
Supply Voltage VCC -0.5 to +6.0 VDC
Input Voltage VIN -0.3 to (VDD +0.3)* VDC
Voltage Applied to Outputs in High Impedance (Off) State VHZ -0.3 to (VDD +0.3)* VDC
Storage Temperature Range TSTG -55 to +125 °C
DC Input Clamp Current IIK ±20 mA
DC Output Clamp Current IOK ±20 mA
Static Discharge Voltage (25°C) VESD ±2500 VDC
Latch-up Current (25°C) ITRIG ±400 mA
* VCC = +5V ± 5%.
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
DSH-201723C Conexant Proprietary and Confidential Information 3-13
Handling CMOS Devices
The device contains circuitry to protect the inputs against damage due to high static
voltages. However, it is advised that normal precautions be taken to avoid application of
any voltage higher than maximum rated voltage.
An unterminated input can acquire unpredictable voltages through coupling with stray
capacitance and internal cross talk. Both power dissipation and device noise immunity
degrades. Therefore, all inputs should be connected to an appropriate supply voltage.
Input signals should never exceed the voltage range from -0.3V to VDD + 0.3V. This
prevents forward biasing the input protection diodes and possibly entering a latch up
mode due to high current transients.
Table 3-11. Current and Power Requirements
Current Power
Mode Typical
Current (mA)
Maximum
Current (mA)
Typical
Power (mW)
Maximum
Power (mW)
Enumeration 76 77 380 404
Operating (Idle) 76 77 380 404
Operating (Connected) 87 88 435 462
Notes:
1. Test conditions: VCC = +5.0 V for typical values; VCC = + 5.25 V for maximum values.
2. Input Ripple 0.1 Vpeak-peak.
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
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3.4 Crystal Specifications
Crystal specifications are listed in Table 3-12.
Table 3-12. Crystal Specifications
Characteristic Value
Frequency 28.224 or 27.000 MHz nominal
Calibration Tolerance ±50 ppm at 25°C (CL = 16.5 and 19.5 pF)
Frequency Stability vs. Temperature ±35 ppm (0°C to 70°C)
Frequency Stability vs. Aging ±20 ppm/5 years
Oscillation Mode Fundamental
Calibration Mode Parallel resonant
Load Capacitance, CL 18 pF nom.
Shunt Capacitance, CO 7 pF max.
Series Resistance, R1 35-60 max. @20 nW drive level
Drive Level 100 µW correlation; 500 µW max.
Operating Temperature 0°C to 70°C
Storage Temperature –40°C to 85°C
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
4-2 Conexant Proprietary and Confidential Information DSH-201723C
Figure 4-1. Package Dimensions for 20-Pin QFN
0.24
0.00
E
P
0
E1
A3
A2
A1
-
D1
D
0.70
0.60
0.05
6.00 BSC
0.42
5.75 BSC
0.20 REF.
0.65
0.01
5.75 BSC
6.00 BSC
12°
11
MIN.
A-
S
B
M
Y
L
O
0.90
MAX.
0.85
NOM.
DIMENSIONS (mm)
T
N
O
E
3
3
3
4
NOTES:
1. NOT APPLICABLE.
2. DIMENSIONING & TOLERANCES CONFORM TO ASM EY14.5M . - 1994.
3. N ISTHE NUM BER OF TERM INALS.
Nd ISTHE NUMBER OFTERMINALS IN X-DIRECTION.
Ne ISTHE NUMBER OFTERMINALS IN Y-DIRECTION.
4. DIMENSION b APPLIESTO PLATED TERMINAL AND IS M EASURED
BETWEEN 0.20 AND 0.25mm FROM TERM INAL TIP.
5. THE PIN #1 IDENTIFIER (INDENTATION M ARK OR OTHER FEATURE).
6. EXACT SHAPE AND SIZE OFTHIS FEATURE IS OPTIONAL.
7. ALL DIM ENSIONS ARE IN MILLIM ETERS.
8. THE SHAPE SHOW N ON FOUR CORNERS ARE NOT ACTUAL I/O.
9. PACKAGE WARPAGE IS 0.05mm M AXIM UM .
10. APPLIED FOR EXPOSED PAD AND TERM INALS. EXCLUDE EM BEDDING
PART OF EXPOSED PAD FROM M EASURING.
11. APPLIED ONLY FORTERM INALS.
Nd 5
b 0.28 0.33 0.40
0.80 BSC
e
L0.600.50 0.75
Ne 5
20
N
20-PIN 6x6m m QFN_(REF: 45278_PVA_EPVB)
POD_20QFN _6x6m m _PVA_EPVC (05-1499ill)
D2 3.95 4.10 4.25
E2 3.95 4.10 4.25
0.60 DIA.
D1/2
D1
D/2
D
E1/ 2 E/2
E1 E
2X
A
2X
0.10
B
C
A
20
SEATING
PLANE
20
56
3
2
b
e
1
0.05
B
C
0.10
2X
C
0.10
0.10
2X
B
L
3.2 REF.
3.2 REF.
A1
A
C
10
C
4X P
4X P
C
A
A3
A2
E2
E2/2
D2
D2/2 PIN#1 ID
R0. 20
0.45
(MIN. 0.35)
(MIN. 0.35)
0
0.10 C
3
2
1
FOR PIN #1 ID AND
SEE DETAI L "A"
TIE BAR M ARK OPTION
b
SCALE: NONE
TERM INAL TIP
C
C
L
C
e
411
A1
0.05
0.10
M
MBA
C
C
13
4
TOP VIEW BOTTOM V IEW
SIDEVIEW
SECTION "C-C"
TERM INAL/ SIDE
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
DSH-201723C Conexant Proprietary and Confidential Information 4-3
Figure 4-2. Package Dimensions for 16-Pin QFN
Max.
0.75
0.90
0.70
D
E
E1
D1
A
A1
A3
A2
---
---
0.00
4.00 BSC
4.00 BSC
3.75 BSC
3.75 BSC
0.20 REF
0.65
0.01
0.85
0.05
L
b0.23
0.50
e
Min.
0.28
0.60
0.35
0.65 BSC
Nom.
D2
E2
1.95 2.10 2.25
1.95 2.10 2.25
PD
_
QFN016
16-Pin QFN Ref. 45250
TERMINALTIP
TOP VIEW
e
D1
3
Pin 1
Identifier
1
2
16
EE1
D
BOTTOM VIEW
A1
PLANE
SEATING
b
A2
A3
A1
A
L
e
3
E2
2
D2
1
16
NOTE 1
SCALE: N ONE
SECTION "C-C"
b
Pin 1
Identifier
NOTES:
1. DIMENSION b APPLIES TO PLATED TERMINAL AND IS MEASURED
BETWEEN 0.20 AND 0.25mm FROM TERMINAL TIP.
Dim.
Millimeters
SIDE VIEW
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
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CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
DSH-201723C Conexant Proprietary and Confidential Information 5-1
5. Recommended QFN Surface Mount Land Patterns
The recommended surface mount land patterns based on the IPC-SM-782 standard for
board layout are shown in Figure 5-1 for the 20-pin QFN and Figure 5-2 for the 16-pin
QFN.
Figure 5-1. Recommended Surface Mount Land Pattern for 20-Pin QFN
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
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Figure 5-2. Recommended Surface Mount Land Pattern for 16-Pin QFN
CX93010-2x UCMxx USB V.92/V.32bis Controllered Modem with CX20548 SmartDAA
DSH-201723C Conexant Proprietary and Confidential Information 6-1
6. USB General Operation
6.1 Descriptors
USB devices report their attributes using descriptors. A descriptor is a data structure with
a defined format, which begins with a byte-wide field that contains the total number of
bytes in the descriptor followed by a byte-wide field that identifies the descriptor type.
Class and vendor specific descriptors may be returned in one of two ways. Class and
vendor specific descriptors that are related to standard descriptors are returned in the
same data buffer as the standard descriptor. If a class or vendor specific descriptor is not
related to a standard descriptor, it is returned using class or vendor specific requests.
6.1.1 Device Descriptor
A device descriptor describes general information about a USB device, which applies
globally to the device and all of the device’s configurations (Table 6-1). A USB device
has only one device descriptor. Vendor ID, Product ID, and Device Release Number can
be changed. The Manufacturer Name, Product Name, and Serial Number can also be
customized.
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Table 6-1. Device Descriptors
Offset Field Size Value Default
(Hex.)
Description
0 bLength 1 Number 12 Size of this descriptor in bytes.
1 bDescriptorType 1 Constant 01 DEVICE Descriptor Type.
2 bcdUSB 2 BCD 0110 USB Specification Release Number in Binary-Coded
Decimal (i.e., 2.10 is 0x210). This field identifies the
release of the USB Specification that the device and its
descriptors are compliant with.
4 bDeviceClass 1 Class 02 Class code (assigned by USB).
If this field is reset to 0, each interface within a
configuration specifies its own class information and the
various interfaces operate independently.
If this field is set to a value between 1 and 0xFE, the
device supports different class specifications on different
interfaces and the interfaces may not operate
independently. This value identifies the class definition
used for the aggregate interfaces. (For example, a CD-
ROM device with audio and digital data interfaces that
require transport control to eject CDs or start them
spinning.)
If this field is set to 0xFF, the device class is vendor
specific.
5 bDeviceSubClass 1 SubClass 00 Subclass code (assigned by USB).
These codes are qualified by the value of the
bDeviceClass field.
If the bDeviceClass field is reset to 0, this field must also
be reset to 0.
If the bDeviceClass field is not set to 0xFF, all values are
reserved for assignment by USB.
6 bDeviceProtocol 1 Protocol 00 Protocol code (assigned by USB). These codes are
qualified by the value of the bDeviceClass and the
bDeviceSubClass fields. If a device supports class-
specific protocols on a device basis as opposed to an
interface basis, this code identifies the protocols that the
device uses as defined by the specification of the device
class.
If this field is reset to 0, the device does not use class
specific protocols on a device basis. However, it may use
class specific protocols on an interface basis.
If this field is set to 0xFF, the device uses a vendor
specific protocol on a device basis.
7 bMaxPacketSize0 1 Number 40 Maximum packet size for endpoint zero (only 8, 16, 32,
or 64 are valid).
8 idVendor 2 ID 0572 Vendor ID (Conexant ID assigned by usb.org). The OEM
ID will be assigned by usb.org.
10 idProduct 2 ID 1340 Product ID (assigned by Conexant) and stored in OEM-
supplied serial EEPROM:
1340 for data/fax
12 bcdDevice 2 BCD 0100 Device release number in binary-coded decimal.
14 iManufacturer 1 Index 01 Index of string descriptor describing manufacturer.
15 iProduct 1 Index 02 Index of string descriptor describing product.
16 iSerialNumber 1 Index 03 Index of string descriptor describing the device’s serial
number.
17 bNumConfigurations 1 Number 02 Number of possible configurations.
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6.1.2 Configuration Descriptor
A configuration descriptor describes information about a specific device configuration
(see Table 6-2). The descriptor describes the number of interfaces provided by the
configuration.
Table 6-2. Configuration Descriptors
Offset Field Size Value Default
(Hex.)
Description
0 bLength 1 Number 09 Size of this descriptor in bytes.
1 bDescriptorType 1 Constant 02 CONFIGURATION.
2 wTotalLength 2 Number 0049 Total length of data returned for this configuration.
Includes the combined length of all descriptors
(configuration, interface, endpoint, and class or vendor
specific) returned for this configuration.
4 bNumInterfaces 1 Number 02 Number of interfaces supported by this configuration.
5 bConfigurationValue 1 Number 01 Value to use as an argument to Set Configuration to
select this configuration.
6 iConfiguration 1 Index 00 Index of string descriptor describing this configuration.
7 bmAttributes 1 Bitmap A0 Configuration characteristics
D7 Bus Powered
D6 Self Powered
D5 Remote Wakeup
D4..0 Reserved (reset to 0)
A device configuration that uses power from the bus
and a local source sets both D7 and D6. The actual
power source at runtime may be determined using the
Get Status device request.
If a device configuration supports remote wakeup, D5 is
set to 1.
8 MaxPower 1 mA 32 Maximum power consumption of USB device from the
bus in this specific configuration when the device is fully
operational. Expressed in 2 mA units (i.e., 50 =
100 mA).
Note: A device configuration reports whether the
configuration is bus-powered or self-powered. Device
status reports whether the device is currently self-
powered. If a device is disconnected from its external
power source, it updates device status to indicate that it
is no longer self-powered.
A device may not increase its power draw from the bus,
when it loses its external power source, beyond the
amount reported by its configuration.
If a device can continue to operate when disconnected
from its external power source, it continues to do so. If
the device cannot continue to operate, it fails operations
it can no longer support. Host software may determine
the cause of the failure by checking the status and
noting the loss of the device’s power source.
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6.1.3 Interface Descriptor
An interface descriptor describes a specific interface provided by the associated
configuration (see Table 6-3Table 6-3). It is always returned as part of a configuration
descriptor. An interface descriptor never includes endpoint zero in the number of
endpoints.
Table 6-3. Interface Descriptors
Offset Field Size Value Default
(Hex.)
Description
0 bLength 1 Number 09 Size of this descriptor in bytes.
1 bDescriptorType 1 Constant 04 INTERFACE Descriptor Type.
2 bInterfaceNumber 1 Number 00 Number of interface. Zero-based value identifying the
index in the array of concurrent interfaces supported by
this configuration.
3 bAlternateSetting 1 Number 00 Value used to select alternate setting for the interface
identified in the prior field.
4 bNumEndpoints 1 Number 01 Number of endpoints used by this interface (excluding
endpoint zero). If this value is 0, this interface only uses
endpoint zero.
5 bInterfaceClass 1 Class 02 Class code (assigned by USB).
If this field is reset to 0, the interface does not belong to
any USB specified device class.
If this field is set to 0xFF, the interface class is vendor
specific.
All other values are reserved for assignment by USB.
6 bInterfaceSubClass 1 SubClass 02 Subclass code (assigned by USB). These codes are
qualified by the value of the bInterfaceClass field.
If the bInterfaceClass field is reset to 0, this field must
also be reset to 0.
If the bInterfaceClass field is not set to 0xFF, all values
are reserved for assignment by USB.
7 bInterfaceProtocol 1 Protocol 01 Protocol code (assigned by USB). These codes are
qualified by the value of the bInterfaceClass and the
bInterfaceSubClass fields. If an interface supports class-
specific requests, this code identifies the protocols that
the device uses as defined by the specification of the
device class.
If this field is reset to 0, the device does not use a class
specific protocol on this interface.
If this field is set to 0xFF, the device uses a vendor
specific protocol for this interface.
8 iInterface 1 Index 00 Index of string descriptor describing this interface.
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6.1.4 Endpoint Descriptor
Each endpoint used for an interface has its own descriptor, which contains the
information required by the host to determine the bandwidth requirements of each
endpoint (see Table 6-4). An endpoint descriptor, like an Interface Descriptor, is always
returned as part of a configuration descriptor. The default values are:
Interrupt In 1: 07058103400080
Bulk In 2: 07058202400001
Bulk Out 2: 07050202400001
Table 6-4. Endpoint Descriptors
Offset Field Size Value Description
0 bLength 1 Number Size of this descriptor in bytes.
1 bDescriptorType 1 Constant ENDPOINT Descriptor Type.
2 bEndpointAddress 1 Endpoint The address of the endpoint on the USB device described
by this descriptor. The address is encoded as follows:
Bit 0..3: The endpoint number
Bit 4..6: Reserved, reset to 0
Bit 7: Direction, ignored for control endpoints
0 OUT endpoint
1 IN endpoint
3 bmAttributes 1 Bit Map This field describes the endpoint’s attributes when it is
configured using the bConfigurationValue.
Bit 0..1: Transfer Type
00 Control
01 Isochronous
10 Bulk
11 Interrupt
All other bits are reserved
4 wMaxPacketSize 2 Number Maximum packet size this endpoint is capable of sending or
receiving when this configuration is selected.
For isochronous endpoints, this value is used to reserve the
bus time in the schedule, required for the per frame data
payloads. The pipe may, on an ongoing basis, actually use
less bandwidth than that reserved. The device reports, if
necessary, the actual bandwidth used via its normal, non-
USB defined mechanisms.
For interrupt, bulk, and control endpoints smaller data
payloads may be sent, but will terminate the transfer and
may or may not require intervention to restart.
6 bInterval 1 Number Interval for polling endpoint for data transfers. Expressed in
milliseconds.
This field is ignored for bulk and control endpoints. For
isochronous endpoints this field must be set to 1. For
interrupt endpoints, this field may range from 1 to 255.
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6.1.5 Enumeration
The CX93010-2x enumeration process consists of the following steps:
1. Get device descriptor. The host requests and reads the device descriptor to determine
maximum packet size.
2. Set address. The host sends the CX93010-2x’s function address in a data packet
using function endpoint 0. Device firmware interprets this data.
3. Get device descriptor. The host requests and reads the device descriptor to determine
such information as device class, USB Specification compliance level, maximum
packet size for endpoint 0, vendor id, product id, etc.
4. Get configuration descriptor. The host requests and reads the device configuration
descriptor to determine such information as the number of interfaces and endpoints;
endpoint transfer type, packet size, and direction; power source; maximum power;
etc. When the host requests the configuration descriptor, all related interface and
endpoint descriptors are returned.
5. Set configuration. The host assigns a configuration value to the device to establish
the current configuration.
6.1.6 Endpoints
Data transfers with the host are made to/from endpoints on the USB module. The
CX93010-2x provides the function endpoints listed in Table 6-5.
Table 6-5. Endpoints
Endpoint Pair Max. Packet Size USB Data Transfer Types
Function Endpoint 0 64 bytes Control
Function Endpoint 1 64 bytes Interrupt
Function Endpoint 2 64 bytes Bulk
NOTES
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