CX06832-16 - Conexant Systems, Inc.

Data Sheet Conexant Doc. No. 101361C

October 2, 2001

FM336Plus

FM336PlusFM336Plus

FM336Plus

V.34/Group 3 High Performance Fax Modem Family

The Conexantä FM336Plus High Performance Fax Modem family offers ITU-T V.34 half-

duplex mode operation that supports synchronous Group 3 facsimile send and receive

speeds up to 33600 bits per second (bps). The FM336Plus-D and FM336Plus-D90

support ITU-T V.34 duplex data and synchronous/asynchronous modes with rates up to

33600 bps. The FM336Plus-D90 also supports ITU-T V.90 PCM mode, which can receive

data at speeds up to 56 kbps.

The device has low voltage operation and is housed in a 100-pin Plastic Quad Flat

Package (PQFP). The modem’s small size and low power consumption allow the design

of compact system enclosures for use in industrial, office, and home environments.

Table 1 lists the FM336Plus Modem Family models and features.

Utilizing V.34 and V.90 techniques to optimize modem configuration for line conditions,

the modem connects at the optimal selected data rate that the channel can support from

2400 bps up to 56 kbps. The modem can operate over the Public Switched Telephone

Network (PSTN) through a line terminator provided by a Data Access Arrangement

(DAA).

The FM336Plus is backward pin compatible with the previous Conexant FM336 fax

modem, and supports all features of the FM336 family. The FM336Plus also has

numerous feature and performance enhancements. For more information on the

enhancements, refer to the FM336Plus High Performance Fax Modem Designer’s Guide

(Doc No. 101360A).

Table 1. FM336Plus Modem Family Models and Features

Modem Model Part Number V.34 Duplex V.90 Clock/Crystal Input

Fax

Mode

Data

Mode

PCM

Mode

Clock

Oscillator

Crystal

FM336Plus CX06832-11 Yes No No Yes No

FM336Plus CX06832-12 Yes No No No Yes

FM336Plus-D CX06832-13 Yes Yes No Yes No

FM336Plus-D CX06832-14 Yes Yes No No Yes

FM336Plus-D90 CX06832-15 Yes Yes Yes Yes No

FM336Plus-D90 CX06832-16 Yes Yes Yes No Yes

Features

FeaturesFeatures

Features

(Entire FM336Plus Family)

(Entire FM336Plus Family)(Entire FM336Plus Family)

(Entire FM336Plus Family)

• 2-wire half-duplex fax modem modes with

send and receive data rates up to 33600 bps

− V.34 half-duplex, V.17, V.33, V.29, V.27

ter, and V.21 channel 2

− Short train option in V.17 and

V.27 ter

• 2-wire duplex data modem modes

− V.21, V.23 (75 bps TX/1200 bps RX or

1200 bps TX/75 bps RX)

• PSTN session starting

− V.8 and V.8bis signaling

• HDLC support at all speeds

− Flag generation, 0-bit stuffing, ITU-T

CRC-16 or CRC-32 calculation and

generation

− Flag detection, 0-bit deletion, ITU-T

CRC-16 or CRC-32 check sum error

detection

− FSK flag pattern detection during high-

speed receiving

• Tone modes and features

− Programmable single or dual tone

generation

− DTMF receiver

− Tone detection with three programmable

tone detectors

• Serial synchronous data

• Parallel synchronous data

• Automatic Rate Adaptation (ARA) in V.34

half-duplex

• Auto-dial and auto-answer control

• TTL and CMOS compatible DTE interface

− ITU-T V.24 (EIA/TIA-232-E)

(data/control)

− Microprocessor bus

(data/configuration/control)

• Receive dynamic range:

− 0 dBm to -43 dBm for V.17, V.33, V.29,

V.27 ter and V.21

− -9 to -43 dBm for V.34 half-duplex

• Caller ID Demodulation

• Single tone detection in Data Mode

• ADPCM Voice Mode (Conexant Proprietary)

FM336Plus V.34/Group 3 High Performance Fax Modem Family

2Conexant 101361C

Features

FeaturesFeatures

Features

(Entire FM336Plus Family

(Entire FM336Plus Family(Entire FM336Plus Family

(Entire FM336Plus Family−

−−

−Continued)

Continued)Continued)

Continued)

• Programmable RLSD turn-on and turn-off thresholds

• Programmable transmit level: 0 to -15 dBm

• Adjustable speaker output to monitor received signal

• DMA support for interrupt lines

• Two 16-byte FIFO data buffers for burst data transfer with extension

up to 255 bytes

• Diagnostic capability

• V.21 Channel 1 Flag detect

• V.21 Channel 2 Flag detect

• +3.3 V operation with +5 V tolerant inputs

• +5 V analog signal interface

• 100-pin PQFP package

• Typical power consumption

− Normal mode:

VDD1 = 250 mW (+3.3V for DSP);

VDD = 35 mW (+5 V for IA)

− Sleep mode:

VDD1 = 20 mW (+3.3V for DSP);

VDD = 0.1 mW (+5 V for IA)

Distinguishing Features (-D / -D90)

Distinguishing Features (-D / -D90)Distinguishing Features (-D / -D90)

Distinguishing Features (-D / -D90)

• 2-wire duplex data modem modes with send and receive rates

up to 33600 bps

− V.34 duplex (33.6 kbps), V.32 bis, V.32, V.22 bis, and

V.22

− Bell 208, 212A, and 103

• Serial asynchronous data

• Parallel asynchronous data

• In-band secondary channel (V.34 duplex and V.32 bis)

• Automatic Rate Adaptation (ARA) in V.34 duplex and V.32 bis

• Automatic Mode Selection (AMS)

• Digital near-end and far-end echo cancellation

• Bulk delay for satellite transmission

• Receive dynamic range:

− -9 dBm to -43 dBm for V.34 duplex, V.32 bis, V.32, V.22

bis, V.22, and V.23

• 511 pattern generation/detection

• V.13 signaling

• Diagnostic capability

− V.54 inter-DCE signaling

− V.54 local analog and remote digital loopback

Distinguishing Features

Distinguishing FeaturesDistinguishing Features

Distinguishing Features

(-D90 only)

(-D90 only)(-D90 only)

(-D90 only)

• 2-wire duplex data modem modes with receive data rates up to

56 kbps and send data rates as specified in the V.34

specification

− V.90 PCM mode

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 specifications and product descriptions at any time, without notice. Conexant

makes no commitment to update the information contained herein. Conexant shall have no responsibility whatsoever for conflicts or

incompatibilities arising from future changes to its specifications and product descriptions.

No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in

Conexant’s Terms and Conditions of Sale for such products, Conexant assumes no liability whatsoever.

THESE MATERIALS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, RELATING TO

SALE AND/OR USE OF CONEXANT PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A

PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL

PROPERTY RIGHT. Conexant further does not warrant the accuracy or completeness of the information, text, graphics or other items

contained within these materials. Conexant shall not be liable for any special, indirect, incidental, or consequential damages, including without

limitation, lost revenues or lost profits, which may result from the use of these materials.

Conexant products are not intended for use in medical, life saving or life sustaining applications. Conexant customers using or selling

Conexant products for use in such applications do so at their own risk and agree to fully indemnify Conexant for any damages resulting from

such improper use or sale.

The following are trademarks of Conexant Systems, Inc.: Conexant, the Conexant C symbol, and “What’s Next in Communications

Technologies.” Product names or services listed in this publication are for identification purposes only, and may be trademarks of third

parties. Third-party brands and names are the property of their respective owners.

Reader Response: Conexant strives to produce quality documentation and welcomes your feedback. Please send comments and

suggestions to conexant.tech.pubs@conexant.com. For technical questions, contact your local Conexant sales office or field applications

engineer.

V.34/Group 3 High Performance Fax Modem Family FM336Plus

101361C Conexant 3

Group 3 Facsimile Modem

(Entire FM336Plus Family)

The modem satisfies the requirements specified in ITU-T

Recommendations V.34 half-duplex, V.17, V.33, V.29,

V.27 ter, V.21, and meets the binary signaling

requirements of V.8 and T.30 with Annex F.

Internal HDLC support eliminates the need for an external

serial input/output (SIO) device in the DTE for products

incorporating error detection and T.30 protocol. The

modem can perform HDLC framing per T.30 at all data

speeds. CRC generation/checking along with zero

insertion/deletion enhances SDLC/HDLC frame

operations. Two FSK (V.21 Ch. 1 and V.21 Ch. 2) flag

pattern detectors facilitate FSK detection during high-

speed reception. The modem features a programmable

DTMF transmitter/receiver and three programmable tone

detectors.

Duplex Data Mode (-D / -D90)

The duplex data mode supports Internet facsimile

applications. The modem can connect at the highest data

rate up to 33600 bps with auto fall back to V.32 bis. The

FM336Plus-D and FM336Plus-D90 modems satisfy the

requirements specified in ITU-T Recommendations V.34,

V.32 bis, V.32, V.22 bis, V.22, V.23, V.21, Bell 208, Bell

212A, and Bell 103.

ITU-T V.90 PCM Mode (-D90)

The ITU-T V.90 PCM mode can receive data at speeds

up to 56 kbps from a digitally connected V.90 central site

modem. The FM336Plus-D90 takes advantage of the

PSTN which is primarily digital to the central office local

loop (except for the client modem) and is ideal for

applications such as remote access to an Internet

Service Provider (ISP), online service, or corporate

intranet. The modem can send upstream data at speeds

up to the V.34 rate.

Technical Specifications

The FM336Plus modem provides the processing core for

a complete facsimile modem design.

Configurations and Rates

Selectable modem configurations, signaling rates, and

data rates are listed in Table 2.

Automatic Mode Selection (-D / -D90)

When Automatic Mode Selection (AMS) is enabled, the

modem configures itself to the highest compatible data

rate supported by the remote modem. Automode

operation is supported in V.90 (-D90 only), V.34, V.32 bis,

V.32, V.22 bis, V.22, V.21, V.23, Bell 208, Bell 212A, and

Bell 103 modes.

Automatic Rate Adaptation

In V.34 duplex, V.34 half-duplex, and V.32 bis modes,

Automatic Rate Adaptation (ARA) can be enabled to

select the optimal highest acceptable data rate based on

the Eye Quality Monitor (EQM). This selection occurs

during startup.

Two ARA modes are available. ARA in ROM is an

adaptive selection made by the modem based upon a

fixed ROM table. ARA in RAM is based on the host

programmable RAM table and can be changed by the

user.

Data Encoding

The data encoding conforms to ITU-T Recommendations

V.90 (-D90 only), V.34, V.32 bis, V.32, V.17, V.33, V.29,

V.27 ter, V.22 bis, V.22, V.23, or V.21, and is compatible

with Bell 208, 212A, or 103, depending on the

configuration.

Tone Generation

The modem can generate single or dual voice-band tones

from 0 Hz to 3600 Hz with a resolution of 0.15 Hz and an

accuracy of ± 0.01%. Tones over 3000 Hz are

attenuated. DTMF tone generation allows the modem to

operate as a programmable DTMF dialer.

FM336Plus V.34/Group 3 High Performance Fax Modem Family

4Conexant 101361C

Supervisory Tone Detection

Three parallel tone detectors (A, B, and C) are provided

for supervisory tone detection. The signal path to these

detectors is separate from the main received signal path.

Each tone detector consists of two cascaded second

order IIR biquad filters. The coefficients are host

programmable. Each fourth order filter is followed by a

level detector which has host programmable turn-on and

turn-off thresholds allowing hysteresis. A pre-filter and

squarer precede tone detector C. This circuit is useful for

detecting a tone with a frequency equal to the difference

between two tones that may be simultaneously present

on the line. The SQDIS bit may disable the squarer

causing tone detector C to be an eight-order filter. The

tone detectors are disabled in data mode.

The tone detection sample rate is 9600 Hz in V.8 and

V.34 modes and is 7200 Hz in non-V.34 modes. The

default call progress filter coefficients are based on a

7200 Hz sampling rate and apply to non-V.34 modes

only. The maximum detection bandwidth is equal to one-

half the sample rate.

Auto-Dialing and Auto-Answering Control

Features are provided to allow the host to perform auto-

dialing and auto-answering. These functions include

DTMF or pulse dialing, ring detection, and a

comprehensive supervisory tone detection scheme. The

major control parameters are host programmable.

Transmitted Data Spectrum

The transmitter spectrum is shaped by raised cosine filter

functions, either the square root of 12.5% (V.34, V.32 bis,

V.32), 20% (V.17, V.33, and V.29), 50% (V.27 ter, Bell

208), or 75% (V.22 bis, Bell 212A).

Scrambler/Descrambler

A self-synchronizing scrambler/descrambler is used in

accordance with the selected configuration.

Transmit Level

The transmitter output level is selectable from 0 dBm to

-15 dBm in 1 dB steps and is accurate to ±0.5 dB when

used with an external hybrid. The output level can also be

tuned by changing a gain constant in the modem DSP

RAM. The maximum V.34 transmit level for acceptable

receive performance should not exceed -9 dBm.

Answer Tone (-D / -D90)

When the NV25 bit is a zero, the modem generates a

2100 Hz answer tone at the beginning of the answer

handshake for 5.0 seconds (V.8) or 3.6 seconds

(V.32 bis, V.32, V.22 bis, V.22, V.23, and V.21). The

answer tone has 180° phase reversals every 0.45

seconds to disable network echo cancellers (V.8,

V.32 bis, and V.32).

Receive Level

The modem satisfies performance requirements for

received line signal levels from 0 dBm to -43 dBm

measured at the receiver analog (TIP and RING) input in

V.17, V.33, V.29, V.27 ter, and DTMF modes. In V.90,

V.34, V.32 bis, V.32, V.22 bis, V.22, and V.23 modes, the

receive level range is from -9 dBm (-15 dBm at RIN) to -43

dBm. (A 6 dB pad is required between TIP/RING and RIN;

RIN is 6 dB lower than TIP and RING.)

Carrier Recovery

The carrier recovery circuit can track a ±7 Hz frequency

offset in the received carrier.

Clamping

Received Data (RXD) is clamped to a constant mark

whenever the Received Line Signal Detector (RLSD) is

off. RLSD can be clamped off (RLSDE bit).

Echo Canceller (-D / -D90)

A data echo canceller with near-end and far-end echo

cancellation is included for 2-wire duplex V.90/V.34/

V.32 bis/V.32 operation. The combined echo span of

near and far cancellers can be up to 40 ms. The

proportion allotted to each end is automatically

determined by the modem. The delay between near-end

and far-end echoes can be up to 1.2 seconds.

V.34/Group 3 High Performance Fax Modem Family FM336Plus

101361C Conexant 5

Table 2. Configurations, Signaling Rates, and Data Rates

Configuration Modulation Carrier Frequency

(Hz) ±0.01%

Data Rate (bps)

±0.01%

Symbol Rate

(Symbols/Sec)

Bits/Symbol

Data

Bits/Symbol

TCM

Constellation

Points

V.90 PCM PCM — 56000 R/V.34 rates T

(Note 4)

8000 Dynamic — —

V.34 33600 TCM3TCM Note 2 33600 3429 only Note 2 Note 2 Note 2

V.34 31200 TCM3TCM Note 2 31200 3200 min Note 2 Note 2 Note 2

V.34 28800 TCM3TCM Note 2 28800 3000 min Note 2 Note 2 Note 2

V.34 26400 TCM3TCM Note 2 26400 2800 min Note 2 Note 2 Note 2

V.34 24000 TCM3TCM Note 2 24000 2800 min Note 2 Note 2 Note 2

V.34 21600 TCM3TCM Note 2 21600 2400 min Note 2 Note 2 Note 2

V.34 19200 TCM3TCM Note 2 19200 Note 2 Note 2 Note 2 Note 2

V.34 16800 TCM3TCM Note 2 16800 Note 2 Note 2 Note 2 Note 2

V.34 14400 TCM3TCM Note 2 14400 Note 2 Note 2 Note 2 Note 2

V.34 12000 TCM3TCM Note 2 12000 Note 2 Note 2 Note 2 Note 2

V.34 9600 TCM3TCM Note 2 9600 Note 2 Note 2 Note 2 Note 2

V.34 7200 TCM3TCM Note 2 7200 Note 2 Note 2 Note 2 Note 2

V.34 4800 TCM3TCM Note 2 4800 Note 2 Note 2 Note 2 Note 2

V.34 2400 TCM3TCM Note 2 2400 2400 only Note 2 Note 2 Note 2

V.32 bis 14400 TCM TCM 1800 14400 2400 6 1 128

V.32 bis 12000 TCM TCM 1800 12000 2400 5 1 64

V.32 bis 9600 TCM TCM 1800 9600 2400 4 1 32

V.32 bis 7200 TCM TCM 1800 7200 2400 3 1 16

V.32 bis 4800 QAM 1800 4800 2400 2 0 4

V.32 9600 TCM TCM 1800 9600 2400 4 1 32

V.32 9600 QAM 1800 9600 2400 4 0 16

V.32 4800 QAM 1800 4800 2400 2 0 4

V.22 bis 2400 QAM 1200/2400 2400 600 4 0 16

V.22 bis 1200 DPSK 1200/2400 1200 600 2 0 4

V.22 1200 DPSK 1200/2400 1200 600 2 0 4

V.22 600 DPSK 1200/2400 600 600 1 0 4

V.23 1200/75 FSK 1700/420 1200/75 1200 1 0 —

V.21 FSK 1080/1750 Up to 300 300 1 0 —

Bell 208 4800 DPSK 1800 4800 1600 3 0 8

Bell 212A DPSK 1200/2400 1200 600 2 0 4

Bell 103 FSK 1170/2125 Up to 300 300 1 0 —

V.17 14400

TCM/V.33

TCM 1800 14400 2400 6 1 128

V.17 12000

TCM/V.33

TCM 1800 12000 2400 5 1 64

V.17 9600 TCM TCM 1800 9600 2400 4 1 32

V.17 7200 TCM TCM 1800 7200 2400 3 1 16

V.29 9600 QAM 1700 9600 2400 4 0 16

V.29 7200 QAM 1700 7200 2400 3 0 8

V.29 4800 QAM 1700 4800 2400 2 0 4

V.27 ter 4800 DPSK 1800 4800 1600 3 0 8

V.27 ter 2400 DPSK 1800 2400 1200 2 0 4

V.21 Channel 2 FSK 1750 300 300 1 0 —

Notes:

1. Modulation legend:

TCM: Trellis-Coded Modulation FSK: Frequency Shift Keying

QAM: Quadrature Amplitude Modulation DPSK: Differential Phase Shift Keying

PCM: Pulse Coded Modulation

2. Adaptive, established during handshake:

Symbol Rate (Baud) V.34 Low Carrier Frequency (Hz) V.34 High Carrier Frequency (Hz)

2400 1600 1800

2800 1680 1867

3000 1800 2000

3200 1829 1920

3429 1959 1959

3. For both duplex and half-duplex modes.

4. Maximum data rate.

FM336Plus V.34/Group 3 High Performance Fax Modem Family

6Conexant 101361C

Data Formats

Serial Synchronous Data

• Data rate: 300-56000 bps (-D90) or

300-33600 bps ±0.01%

• Selectable clock: Internal, external, or slave

Serial Asynchronous Data (-D / -D90)

• Data rate: 300-56000 bps (-D90) or

300-33600 bps +1%/-2.5% or +2.3%/-2.5%; up to

300 bps (V.21 and Bell 103); 1200/75 bps (V.23)

• Bits per character (including Start Bit, Parity Bit, and

Stop Bit): 7, 8, 9, 10, or 11

Parallel Synchronous Data

• Normal sync: 8-bit data for transmit and receive

• Data rate: 300-56000 bps (-D90) or

300-33600 bps ±0.01%

• SDLC/HDLC support:

− Transmitter: Flag generation, 0-bit stuffing,

CRC-16 or CRC-32 generation

− Receiver: Flag detection, 0-bit deletion, CRC-16 or

CRC-32 checking

Parallel Asynchronous Data (-D / -D90)

• Data rate: 300-56000 bps (-D90) or

300-33600 bps +1%/-2.5% or +2.3%/-2.5%;

1200, 300, or 75 bps (FSK)

• Data bits per character: 5, 6, 7, or 8

• Parity generation/checking: Odd, Even, or 9th data bit

Async/Sync and Sync/Async Conversion

(-D / -D90)

An asynchronous-to-synchronous converter is provided in

the transmitter and a synchronous-to-asynchronous

converter is provided in the receiver. The converters

operate in both serial and parallel modes. The

asynchronous character format is 1 start bit, 5 to 8 data

bits, an optional parity bit, and 1 or 2 stop bits. Valid

character size, including all bits, is 7, 8, 9, 10, or 11 bits

per character. Two ranges of signaling rates are provided:

• Basic range: +1% to -2.5%

• Extended overspeed range: +2.3% to -2.5%

When the transmit converter is operating at the basic

signaling rate, no more than one stop bit will be deleted

per eight consecutive characters. When operating at the

extended rate, no more than one stop bit will be deleted

per four consecutive characters. Break handling is

performed as described in V.14.

Asynchronous characters are accepted on the TXD serial

input and are issued on the RXD serial output.

V.54 Inter-DCE Signaling (-D / -D90)

The modem supports V.56 inter-DCE signaling

procedures in synchronous and asynchronous

configuration. Transmission and detection of the

preparatory, acknowledgment, and termination phases as

defined in V.54 are provided. Three control bits (VT54T,

V54A, and V54P) in the transmitter allow the host to send

the appropriate bit patterns. Three control bits (V54TE,

V54AE, and V54PE) in the receiver are used to enable

one of the three bit pattern detectors. A status bit

(V54DT) indicates when the selected pattern detector has

found the corresponding bit pattern.

V.13 Remote RTS Signaling (-D / -D90)

The modem supports V.13 remote RTS signaling.

Transmission and detection of signaling bit patterns in

response to a change of state in the RTS bit or the /RTS

input signal are provided. This feature may be used to

clamp/unclamp the local/RLSD and RXD signals in

response to a change in the remote /RTS signal in order

to simulate controlled carrier operation in a constant

carrier environment. The modem automatically clamps

and unclamps /RLSD.

511 Pattern Generation/Detection (-D / -D90)

In synchronous mode, a 511 pattern can be generated

and detected (control bit S511). Use of this bit pattern

during self-test eliminates the need for external test

equipment.

In-Band Secondary Channel (-D / -D90)

A duplex in-band secondary channel is provided in V.34

(all speeds) and V.32 bis/V.32 (7200 bps and above)

modes. The secondary channel operates in parallel data

mode with independent transmit and receive interrupts

and data buffers. The main channel may operate in

parallel or serial mode.

In V.34 modes, the secondary channel rate is 200 bps.

In V.32 bis/V.32 modes, the secondary channel rate is

150 bps. This rate is also host programmable in

V.32 bis/V.32 modes.

Transmit FIFO Buffer and Receive FIFO Buffer

Two 16-byte first-in first-out (FIFO) data buffers allow

the DTE/host to output up to 16 bytes of transmit data

to the Transmit FIFO Buffer (TXFIFO) and input up to

16 bytes of accumulated received data from the

Receive FIFO Buffer (RXFIFO).

V.34/Group 3 High Performance Fax Modem Family FM336Plus

101361C Conexant 7

The RXFIFO is always enabled. The host can enable

the TXFIFO. Status bits indicate when the TXFIFO is

not full, the TXFIFO is half-full (eight or more bytes

loaded), the RXFIFO is empty, and the RXFIFO is half-

full. An interrupt mask register allows an interrupt

request to be generated whenever the status bits

change state.

Transmit Extended FIFO Buffer and Receive

Extended FIFO Buffer

The TXFIFO and RXFIFO can be extended up to an

additional 255 bytes with the Transmit Extended FIFO

Buffer (TXEFIFO) and the Receive Extended FIFO

Buffer (RXEFIFO). The size of the FIFO extension is

255 bytes overall and can be divided between the two

extended FIFOs in any proportion.

DMA Support for Interrupt Request Lines

DMA support is available in synchronous data modes.

When DMA support is enabled, the modem /RI and /DSR

lines are assigned to Transmitter Request (TXRQ) and

Receiver Request (RXRQ) hardware output interrupt

request lines, respectively. The TXRQ and RXRQ signals

follow the assertion of the Transmit Data Buffer Empty

(TDBE) and Receive Data Buffer Full (RDBF) interrupt

bits, thereby allowing the DTE/host to respond

immediately to the interrupt request without masking out

status bits to determine the interrupt source.

NRZI Encoding/Decoding

NRZI data encoding/decoding may be selected in

synchronous modes instead of the default NRZ via

control bit NRZIEN. In NRZ encoding, a 1 (one) is

represented by a high level and 0 (zero) is represented

by a low level. In NRZI encoding, a 1 is represented by

no change in level and a 0 is represented by a change

in level.

ITU-T CRC-32 Support

ITU-T CRC-32 generation/checking may be selected

instead of the default ITU-T CRC-16 in HDLC mode using

DSP RAM access.

ADPCM Voice Mode (Conexant Proprietary)

A Conexant proprietary Adaptive Differential Pulse Code

Modulation (ADPCM) voice coder and decoder (codec) is

provided to compress and decompress voice signals for

efficient digital storage of voice messages. The codec

operates at 32 Kbps, 24 Kbps, or 16 Kbps (4-bit, 3-bit, or

2-bit quantization, respectively) with an 8.0 kHz sampling

rate.

Caller ID Demodulation

Caller ID information can be demodulated in the V.23

1200 receive configuration and presented to the

DTE/host in serial (RXD) or parallel (RBUFFER) form.

Single Tone Detection in Data Mode

A tone detector is provided to perform single tone

detection and is available in V.90, V.34, V.32bis, V.32,

V.17, V.29, and V.27ter modes. By default, single tone

level down to approximately -28 dBm can be detected.

The detector can tolerate near-end echo levels up to

10 dB above the call waiting tone level.

Telephone Line Interface

Line Transformer Interface. V.90/V.34 places high

requirements upon the Data Access Arrangement (DAA)

connection to the telephone line. Due to the wider

bandwidth requirement of V.90 and V.34, the DAA must

maintain linearity from 150 to 3950 Hz for V.34, and from

10 to 4000 Hz for V.90.

Relay Control. Direct control of the off-hook and

talk/data relays is provided. Internal relay drivers allow

direct connection to the off-hook and talk/data relays. The

talk/data relay output can optionally be used for pulse

dial.

Speaker Interface. A SPKR output is provided with

on/off and volume control logic incorporated in the

modem, requiring only an external amplifier to drive a

speaker.

Clock Sources

The modem is offered in two configurations depending

upon the selected clock source. One configuration utilizes

a crystal source and the other uses an oscillator source.

For the crystal configuration, the crystal is connected to

XTALI (pin 85) and XTALO (pin 86). For the oscillator

source, the oscillator is connected to CLKIN (pin 85) and

XTALO (pin 86) is not connected.

FM336Plus V.34/Group 3 High Performance Fax Modem Family

8Conexant 101361C

Hardware Interface Signals

Figure 1 illustrates the functional interface signals. In this

diagram, an active low signal is indicated by a forward

slash “/” (e.g., /RESET). A clock intended to activate logic

on its rising edge (low-to-high transition) is called active

high (e.g., TDCLK), while a clock intended to activate

logic on its falling edge (high-to-low transition) is called

active low (e.g., /RDCLK).

Figure 2 illustrates the modem pin assignments.

Table 3 provides the signal descriptions.

Electrical and Environmental Specifications

Table 4 lists the operating conditions.

Table 5 lists the absolute maximum ratings.

Table 6 lists the current and power requirements.

Package Dimensions

Figure 3 shows the package dimensions.

Additional Information

Additional design information is described in the

FM336Plus V.34/Group3 High Performance Fax Modem

Designer’s Guide (Doc No. 101360A).

V.34/Group 3 High Performance Fax Modem Family FM336Plus

101361C Conexant 9

Figure 1. Functional Interface Signals

101360_001

V.24

Interface

Host

Processor

FM336Plus

Modem Family

Crystal

Power Supply

Speaker

Amplifier

Optional

Eye Pattern

Generator

Line

Interface

/RTS

TXD

/CTS

TDCLK

XTCLK

/RLSD

RXD

/RDCLK

/DTR

/RI(1)

/DSR(2)

/RD

/CS

/WR

D[7:0]

RS[4:0]

IRQ

/RESET

TXRQ(1)

RXRQ(2)

XTALO

XTALI

TXA1

RIN

TXA2

/TALK

RINGD

EYEXY

EYESYNC

EYECLK

+5V

AGND

DGND

SPKR

TIP

RING

Telephone

Line

+3.3V

Oscillator

CLKIN

NOTE(S):

(1) Selectable; TXRQ output replaces /RI output.

(2) Selectable; RXRQ output replaces /DSR output.

FM336Plus V.34/Group 3 High Performance Fax Modem Family

10 Conexant 101361C

Figure 2. FM336Plus Family Modem Pin Assignments—100-Pin PQFP

101360_002

RESERVED

RS2

RS3

RS4

/CS

/WR

/RD

/RDCLK

/RLSD

TDCLK

TXD

/CTS

VDD1

RESERVED

VSS

/RESET

SR4OUT

SR4IN

CLK_OUT

EYESYNC

EYECLK

MAVSS

MAVDD

SPKR

TXA2

TXA1

VREF

VSS

IRQ

/RTS

RINGD

/RI

/DSR

EYEXY

XCLK

YCLK

VGG

IA_SLEEP

VDD1

/DTR

RXD

RESERVED

VSS

XTCLK

VDD1

VCORE

SR1IO

RESERVED

VDD1

SLEEP

VSS

VSUB

RESERVED

RIN

MAVSS

/POR

RESERVED

/TALK

VDD

RESERVED

M_CNTRL_SIN

M_CLKIN

M_TXSIN

M_SCK

M_RXOUT

M_STROBE

RESERVED

VDD

PLL_GND

VSS

PLL_VDD

RS1

RS0

VDD1

XTALO

XTALI/CLKIN

VDD1

RESERVED

GP00

100

V.34/Group 3 High Performance Fax Modem Family FM336Plus

101361C Conexant 11

Table 3. Signal Descriptions

Pin Signal Label I/O Type1Interface3Pin Signal Label I/O Type1Interface3

1 RESERVED — NC 51 RESERVED — NC

2 RS2 IA HOST Interface 52 VSUB GND —

3 RS3 IA HOST Interface 53 VSS GND —

4 RS4 IA HOST Interface 54 NC — NC

5 /CS IA HOST Interface 55 NC — NC

6 /WR IA HOST Interface 56 Sleep MI Modem Interconnect

7 /RD IA HOST Interface 57 VDD1 PWR —

8 /RDCLK OA DTE Serial Interface 58 NC — NC

9 /RLSD OA DTE Serial Interface 59 RESERVED — NC

10 TDCLK OA DTE Serial Interface 60 RESERVED — NC

11 TXD IA DTE Serial Interface 61 SR1IO MI Modem Interconnect

12 /CTS OA DTE Serial Interface 62 VCORE PWR —

13 VDD1 PWR — 63 VDD1 PWR —

14 RESERVED — NC 64 XTCLK IA DTE Serial Interface

15 RESERVED — NC 65 VSS GND —

16 VSS GND — 66 RESERVED — NC

17 NC — NC 67 RXD OA DTE Serial Interface

18 /RESET IA Modem Interconnect 68 /DTR IA DTE Serial Interface

19 SR4OUT OA Modem Interconnect 69 VDD1 PWR —

20 NC — NC 70 IA_SLEEP MI Modem Interconnect

21 SR4IN IA Modem Interconnect 71 VGG PWR —

22 CLK_OUT OA Modem Interconnect 72 YCLK OA Overhead Signal

23 EYESYNC OA Diagnostic Signal 73 XCLK OA Overhead Signal

24 EYECLK OA Diagnostic Signal 74 EYEXY OA Diagnostic Signal

25 MAVSS GND — 75 /DSR OA DTE Serial Interface

26 MAVDD PWR — 76 /RI OA Telephone Line

Interface

27 SPKR O(DF) Telephone Line Interface 77 RINGD IA Telephone Line

Interface

28 TXA2 O(DD) Telephone Line Interface 78 /RTS IA DTE Serial Interface

29 TXA1 O(DD) Telephone Line Interface 79 IRQ OA HOST Interface

30 VREF MI Modem Interconnect 80 VSS GND —

31 VC MI Modem Interconnect 81 GP00 MI Modem Interconnect

32 RIN I(DA) Telephone Line Interface 82 RESERVED — NC

33 MAVSS AGND — 83 RESERVED — NC

34 /POR IA Modem Interconnect 84 VDD1 PWR —

35 RESERVED — NC 85 XTALI/CLKIN I Overhead Signal

36 RESERVED — NC 86 XTALO O Overhead Signal

37 /TALK O(DD) Telephone Line Interface 87 D0 IA/OB HOST Interface

38 VDD PWR — 88 D1 IA/OB HOST Interface

39 RESERVED — NC 89 D2 IA/OB HOST Interface

40 RESERVED — NC 90 D3 IA/OB HOST Interface

41 NC — NC 91 D4 IA/OB HOST Interface

42 M_CNTRL_SIN IA Modem Interconnect 92 VDD1 PWR —

43 M_CLKIN IA Modem Interconnect 93 D5 IA/OB HOST Interface

44 M_TXSIN IA Modem Interconnect 94 D6 IA/OB HOST Interface

45 M_SCK IA Modem Interconnect 95 D7 IA/OB HOST Interface

46 M_RXOUT IA Modem Interconnect 96 RS0 IA/OB HOST Interface

47 M_STROBE IA Modem Interconnect 97 RS1 IA/OB HOST Interface

48 RESERVED — NC 98 PLL_VDD PWR —

49 OH O(DD) Telephone Line Interface 99 VSS GND —

50 VDD PWR — 100 PLL_GND GND —

FM336Plus V.34/Group 3 High Performance Fax Modem Family

12 Conexant 101361C

Table 3. Signal Descriptions (Continued)

Notes:

1. I/O types:

MI = Modem interconnect

IA, IB = Digital input

OA, OB = Digital output

I(DA) = Analog input

O(DD), O(DF) = Analog output

2. NC = No external connection required. RESERVED = No external connection allowed.

3. Interface Legend:

HOST = Modem Control Unit (Host)

DTE = Data Terminal Equipment

Table 4. Operating Conditions

Parameter Symbol Min Typ Max Units

DSP Supply Voltage VDD1 3.0 3.3 3.6 VDC

IA Supply Voltage VDD 4.75 5.0 5.25 VDC

Operating Ambient Temperature TA02570

°C

Table 5. Absolute Maximum Ratings

Parameter Symbol Limits Units

Supply Voltage VDD1 -0.5 to +3.8 V

Digital Input Voltage VIND -0.5 to (+5VD +0.5) V

Operating Temperature Range TA-0 to +70 °C

Storage Temperature Range TSTG -55 to +125 °C

Analog Input Voltage VINA -0.3 to (+5VA + 0.3) V

Voltage Applied to Outputs in High Impedance (Off) State VHZ -0.5 to (+5VD + 0.5) V

DC Input Clamp Current IIK ±20 mA

DC Output Clamp Current IOK ±20 mA

Static Discharge Voltage (25°C) VESD ±2500 V

Latch-up Current (25°C) ITRIG ±200 mA

Table 6. Current and Power Requirements

Power Supply

Typical Current

@ 25°C

Maximum Current

@ 0°C

Typical Power

@ 25°C

Maximum Power

@ 0°C

VDD1 (+3.3V for DSP)

Normal Mode 76 mA 88 mA 250 mW 320 mW

Sleep Mode 6 mA 8 mA 20 mW 30 mW

VDD (+5 V for IA)

Normal Mode 7 mA 10 mA 35 mW 53 mW

Sleep Mode 20 µA 24 µA0.1 mW 0.13 mW

Note:

Test conditions: VDD1 (for DSP) = +3.3 VDC for typical values; VDD1 = +3.6 VDC for maximum values.

VDD (for IA) = +5 VDC for typical values; VDD = +5.25 VDC for maximum values.

V.34/Group 3 High Performance Fax Modem Family FM336Plus

101361C Conexant 13

Figure 3. Package Dimensions—100-Pin PQFP

Millimeters

0.05

22.95

16.95

0.73

0.25

0.13

2.4 MAX

0.35

2.0 REF

23.45

20.0 REF

18.85 REF

17.45

14.0 REF

12.35 REF

1.03

1.6 REF

0.65 BSC

0.45

0.19

0.10 MAX

0.0020

0.9035

0.6673

0.0287

0.0098

0.0051

Coplanarity

Min. Max. Min. Max.

Inches*

Dim.

Ref: 100-PIN PQFP (GP00-D234)

* Metric values (millimeters) should be used for

PCB layout. English values (inches) are

converted from metric values and may include

round-off errors.

0.0945 MAX

0.0138

0.0787 REF

0.9232

0.7874 REF

0.7421 REF

0.6870

0.5512 REF

0.4862 REF

0.0406

0.0630 REF

0.0256 BSC

0.0177

0.0075

0.004 MAX

DETAIL A

SIDE VIEWTOP VIEW

CHAM (4X)

See detail A

PIN 1

REF

101360_010

www.conexant.com

General Information:

U.S. and Canada: (800) 854-8099

International: (949) 483-6996

Headquarters – Newport Beach

4311 Jamboree Rd.

Newport Beach, CA 92660-3007