3.125 Gbps 4x4 LVDS Crosspoint Switch with Transmit Pre-emphasis and Receive Equalization DS25CP104 Evaluation Kit USER MANUAL Part Number: DS25CP104EVK For the latest documents concerning these products and evaluation kit, visit lvds.national.com. Schematics and gerber files are also available at lvds.national.com. February 2008 Rev. 0.2 DS25CP104EVK User Manual Table of Contents Table of Contents.............................................................................................................2 Overview.............................................................................................3 DS25CP104 EVK Description ..................................................................4 CP104 Evaluation .................................................................................6 SMBus Evaluation ................................................................................12 Typical Performance ..............................................................................16 Page 2 of 17 DS25CP104EVK User Manual Overview The DS25CP104EVK is an evaluation kit designed for demonstrating performance of DS25CP104, a 3.125 Gbps 4x4 LVDS Crosspoint Switch with Transmit Pre-emphasis and Receive Equalization. The evaluation kit is comprised of the DS25CP104 with its associated input and output SMA connectors and jumpers to manually select the desired pre-emphasis or equalization, a USB to SMBus conversion circuit to control the SMBus with a PC, and three FR4 striplines (15" (38.1cm), 30" (76.2cm), and 60" (152.4cm) ) to exercise the devices' signal conditioning features (pre-emphasis and equalization). The purpose of this document is to familiarize the user with the DS25CP104EVK, to suggest test setup procedures and instrumentation to test the device optimally, and to guide the user through some typical measurements that demonstrate the performance of the DS25CP104 in typical applications. Figure 1. Photo of the DS25CP104EVK Page 3 of 17 DS25CP104EVK User Manual DS25CP104EVK Description Figure 2 shows the top layer drawing of the PCB with the silkscreen annotations. The 4.5 by 4.5 inch, eight-layer PCB is designed to evaluate the functions of the DS25CP104. Figure 2. Top Layer DS25CP104EVK Page 4 of 17 DS25CP104EVK User Manual For descriptive purposes the DS25CP104EVK can be broken into three parts: 1. The DS25CP104 IC with associated connectors and jumpers is the main part of the board. The block diagram of the DS25CP104 is shown in Figure 3. The receive buffers can be set to Off and Low equalization by the external pins EQ0 - EQ3; the transmit buffers can be set to Off and Med. levels of pre-emphasis by the external pins PE0 - PE3. Since data capabilities are 3.125 Gbps, SMA connectors are used to ensure minimal loss. More information can be found about the DS25CP104 on the data sheets. 2. A USB to SMBus converter has been added to the evaluation kit to implement SMBus switch configuration to control the signal conditioning. Through the SMBus the DS25CP104 currently features four levels (Off, Low, Medium, and High) of preemphasis and two levels (Off, Low) of equalization. ADDRn SCL SDA EN_smb 3. Three channels of stripline have been added to the evaluation kit to test the preemphasis and equalization functions (15" (38.1cm), 30" (76.2cm), and 60" (152.4cm) ). In practical applications, devices often drive long backplanes or cables. To help reduce jitter caused from long backplanes or cables, pre-emphasis can be used for the drivers and equalization for the receivers. Figure 3. DS25CP104 Block Diagram Page 5 of 17 DS25CP104EVK User Manual DS25CP104 Evaluation The DS25CP104 is a 3.125 Gbps LVDS Crosspoint Switch with four levels of transmit pre-emphasis and two levels of receive equalization configured in the SMBus Mode and two levels of transmit pre-emphasis and two levels of receive equalization configured via external jumpers on the evaluation board in the Pin Mode. Initial Pin Settings for Pin Mode Testing Pin SMBus Enable EQ0 - EQ 3 Setting L L PE0 - PE3 L PWDN H Note Disable SMbus Equalization off, See table Pre-Emphasis off, See table Power Down off S00 0 1 0 1 Input Selected IN0 IN1 IN2 IN3 Switch Configuration Truth Tables S01 0 0 1 1 Table 1. Input Select Pins Configuration for the Output OUT0 S11 0 0 1 1 S10 0 1 0 1 Input Selected IN0 IN1 IN2 IN3 Table 2. Input Select Pins Configuration for the Output OUT1 Page 6 of 17 DS25CP104EVK User Manual S21 0 0 1 1 S20 0 1 0 1 Input Selected IN0 IN1 IN2 IN3 Table 3. Input Select Pins Configuration for the Output OUT2 S31 0 0 1 1 S30 0 1 0 1 Input Selected IN0 IN1 IN2 IN3 Table 4. Input Select Pins Configuration for the Output OUT3 Signal Conditioning Tables Output OUTn, n={0,1,2,3} Pre-Emphasis Control Pin (PEn) State Pre-Emphasis Level 0 Off 1 Medium Table 5. Transmit Pre-emphasis Truth Table Input INn, n={0,1,2,3} Equalization Control Pin (EQn) State Equalization Level 0 Off 1 Low Table 6. Receive Equalization Truth Table Stripline Length Table (also known as Test Channels) Stripline L1 L2 L3 Length 15" (38.1cm) 30" (76.2cm) 60" (152.4cm) Table 7. Stripline length table Page 7 of 17 Loss (dB) @ 1250 MHz -3.6 -8.2 -14.5 DS25CP104EVK User Manual Jitter Performance Testing with No Signal Conditioning 1. Configure the test setup as shown in Figure 4. 2. Set the desired INn to OUTn drivers by selecting S00, S01, S10, S11, S20, S21, S30, S31 according to Tables 1 - 4. 3. Select the PEn and EQn jumpers to 0, according to tables 5 and 6. 4. Apply + supply (3.3V typical) to the VDD and - supply (ground) to the VSS connectors. 5. Connect a signal source (signal generator, data source, or an LVDS driver) to the desired INn inputs on the board and adjust the signal parameters (VOH, VOL, VCM) so that they comply with the device input recommendations. 6. Connect an oscilloscope to the selected OUTn outputs and view the output signals with an oscilloscope with the bandwidth of at least 5 GHz. Figure 4. Jitter Performance Test Circuit Page 8 of 17 DS25CP104EVK User Manual Pre-Emphasis Performance Testing In applications where data transmits over cables or long backplanes, the pre-emphasis feature on the DS25CP104 transmitter helps to overcome media loss and reduce bit errors; hence the DS25CP104EVK has three lengths of stripline to test the pre-emphasis function. 1. Configure the test setup as shown in figure 5; select the desired test channel lengths in Table 7. 2. Set the desired INn to OUTn drivers by selecting S00, S01, S10, S11, S20, S21 according to Tables 1 - 4. 3. Select the PEn jumpers to 1 and the EQn jumpers to 0, according to Tables 5 and 6. 4. Apply + supply (3.3V typical) to the VDD and - supply (ground) to the VSS connectors. 5. Connect a signal source (signal generator, data source, or an LVDS driver) to the desired INn inputs on the board and adjust the signal parameters (VOH, VOL, VCM) so that they comply with the device input recommendations. 6. Connect an oscilloscope to the selected OUTn outputs and view the output signals with an oscilloscope with a bandwidth of at least 5 GHz. Figure 5. Pre-Emphasis Performance Test Circuit Page 9 of 17 DS25CP104EVK User Manual Equalization Performance Testing In some applications, data transmits over cables or long backplanes. The equalization function on the DS25CP104 receivers helps to compensate for loss of certain media; hence the DS25CP104EVK has three lengths of stripline to test the equalization function. 1. Configure the test setup as shown in Figure 6; select the desired test channel, lengths in Table 7. 2. Set the desired INn to OUTn drivers by selecting S00, S01, S10, S11, S20, S21, S30, S31 according to Tables 1 - 4. 3. Select the PEn jumpers to 0 and the EQn jumpers to 1, according to Tables 5 and 6. 4. Apply + supply (3.3V typical) to the VDD and - supply (ground) to the VSS connectors. 5. Connect a signal source (signal generator, data source, or an LVDS driver) to the desired INn inputs on the board and adjust the signal parameters (VOH, VOL, VCM) so that they comply with the device input recommendations. 6. Connect an oscilloscope to the selected OUTn outputs and view the output signals with an oscilloscope with a bandwidth of at least 5 GHz. Figure 6. Equalization Performance Test Circuit Page 10 of 17 DS25CP104EVK User Manual Pre-Emphasis and Equalization Performance Testing In some applications, data transmits over cables or long backplanes. The pre-emphasis and equalization functions on the DS25CP104 help to compensate for loss of certain media; hence the DS25CP104EVK has three lengths of stripline to test the pre-emphasis and equalization functions. 1. Configure the test setup as shown in Figure 7; select the desired test channel, lengths in Table 7. 2. Set the desired INn to OUTn drivers by selecting S00, S01, S10, S11, S20, S21, S30, S31 according to Tables 1 - 4. 3. Select the PEn jumpers to 1 and the EQn jumpers to 1, according to Tables 5 and 6. 4. Apply + supply (3.3V typical) to the VDD and - supply (ground) to the VSS connectors. 5. Connect a signal source (signal generator, data source, or an LVDS driver) to the desired INn inputs on the board and adjust the signal parameters (VOH, VOL, VCM) so that they comply with the device input recommendations. 6. Connect an oscilloscope to the selected OUTn outputs and view the output signals with an oscilloscope with a bandwidth of at least 5 GHz. TEST CHANNEL TEST CHANNEL DS25CP104EVK 50 Microstrip 1/4 DS25CP104 50 Microstrip L=4" L=4" L=4" L=4" 50 Microstrip 50 Microstrip PATTERN GENERATOR OSCILLOSCOPE Figure 7. Pre-emphasis and Equalization Performance Test Circuit Page 11 of 17 DS25CP104EVK User Manual SMBus Evaluation Introduction: The CP104 can be evaluated in the Pin Mode using the external pins, or in the SMBus mode. The following section describes how to load and run the Analog Launch Pad from National Semiconductor, a proprietary interface, used to access the SMBus registers of the CP104. The 1st time the application is run on a PC, and only the 1st time, the application file needs to be downloaded, extracted, and then the appropriate driver needs to be enabled. Any time after that, on the same PC, you need only to setup the CP104EVK and then proceed to using the Analog Launch Pad. Loading and running the application file * * * * Download the application file from http://www.national.com/appinfo/lvds/ds25cp104evk.html Place in any folder on your PC, and run the file by double clicking on the file from Windows Explorer (or My Computer); this will extract the file and place it in C:\Program Files\National Semiconductor Corp folder. The Analog Launch Pad will now function only in the Demo mode. The Analog Launch Pad is designed to function on Windows 98/2000/xp Setup the CP104EVK (When using the USB, power should be off to the CP104 and USB unplugged when changing cables or changing the jumper pins.) 1. Install jumper pins as follows: J21, SMBus Enable J4 J3 J15, J16 J18, J19 J24, J22 J20, J23 H inserted removed removed L H L Enables the SMBus USB Controller Reset EEPROM write protect S00 (SCL), S01 (SDA) Address Address Table 8. Jumpers on the CP104EVK for SMBus use 2. Configure the test setup as desired, examples are fig. 4 - fig. 7. 3. Supply 3.3 V Power to board. Page 12 of 17 DS25CP104EVK User Manual Load the driver This needs to be done only once for a particular PC. * * Plug in the USB cable from the PC to the CP104 EVK; a small window should appear in the lower right corner of the PC recognizing new hardware. If the bubble says "USB device not recognized", or nothing happens, check the jumper configuration, if still does not work remove jumper on J4 for 5 sec, and then replace. The USB controller is now reset and should be in communication with the PC; this can be known by "Hi speed USB device plugged into non Hi Speed USB hub" appearing in the window. Follow the instructions for New Hardware Wizard, which may take up to one minute to run. a. select "Install from a list or specific location" b. select "Don't search I will choose the driver to install" c. select "Have disk" d. Browse to "C:\Program Files\National Semiconductor Corp\Analog LaunchPAD v1.07\Drivers" e. select "NSC ALP Nano" from the list f. install the driver g. hit "Continue Anyway" if windows compatibility window is displayed h. finish, you are now ready to run the Analog Launch Pad Page 13 of 17 DS25CP104EVK User Manual Page 14 of 17 DS25CP104EVK User Manual Using the Analog Launch Pad for the CP104EVK The Analog Launch Pad from National Semiconductor is a proprietary interface created to assist developers to test their designs and systems using National's evaluation boards; the CP104EVK interface has been designed into the Analog Launch Pad. The registers of the CP104 can be accessed through this interface enabling all the functions accessed through the SMBus. Below is a picture of the Analog Launch Pad, CP104 interface: Figure 8. Analog Launch Pad, CP104 interface Page 15 of 17 DS25CP104EVK User Manual To use the interface: * Run the application Analog Launch Pad and select CP104 Nano. For the Analog Launch Pad to connect, the board must be powered with the appropriate jumper selections and the USB driver must be functioning. Otherwise it will open into the Demo mode. * Select the "Register" folder and enter the register that you want to change, make the appropriate changes, and then hit Apply. Register descriptions can be found in the DS25CP104 datasheets. Use only Apply to make changes; Refresh, Refresh All, Display, Load, and Save bubbles should not be used. * * A selected square corresponds to a `1' while a blank square corresponds to a `0'. * To change the levels of Pre Emphasis or Equalization, you must first go to "Control" register and enable "Ignore External PE" and "Ignore External EQ" before adjusting the signal conditioning through the SMBus. * To use the "Loss of Signal", you must first go to "Control" register and enable "LOS". * The Verbose Description square switches to a more descriptive text. Page 16 of 17 DS25CP104EVK User Manual * Typical Performance When evaluating the CP104 EVK, the eye diagram response should be similar to those below (measured on the Tektronix CSA 8000) The DS25CP104 3.125 Gbps PRBS-7 output eye diagram with no STRIPLINE connected and with PE/EQ = Off The DS25CP104 3.125 Gbps PRBS-7 output eye diagram after the STRIPLINE 1 (15" FR4) and with EQ = Low. See Figure 6 for the Setup used. The DS25CP104 3.125 Gbps PRBS-7 output eye diagram before the STRIPLINE2 (30" FR4) and with PE/EQ = Off The DS25CP104 3.125 Gbps PRBS-7 output eye diagram before the STRIPLINE 2 (30" FR4) and with PE = Med. See Figure 5 for the Setup used. Page 17 of 17 Note: This document is considered uncontrolled unless stamped otherwise. Note: This document is considered uncontrolled unless stamped otherwise. ENERCON - BILL OF MATERIALS TITLE: Main Product: NATIONAL SEMICONDUCTOR PCBA, DS25CP104EVK, ROHS Rev: Rev By: Rev Date: PL Number: Z3071-01 0 Responsible Eng/Mgr: PCBA, DS25CP104 EVK Item Part Type 1 PCB Part Number/Value Mfg P-05885R0 NoSub Description Qty DS25CP104EVK: 5.25x5.25x.060in, 8 layer 1 Released Creator: Creation Date: Arlene Fox 3/28/2007 Ref Des SMT PL Status: 3/28/2007 Notes Bd: (133.35x 133.35mm) Panel: ( 10.60x5.25in) (269.24x 133.35mm) 2 bds/panel Rev 0 2 3 IC 24LC128-I/SN MICROCHIP 128K bit Serial EEPROM 2.5V, SOIC8, PbFree 1 X U3 0 4 IC CY7C68013A-56LFXC CYPRESS EZ-USB FX2 USB Microcontroller, QFN56, Pb-Free 1 X U1 0 5 IC DS25CP104 NAT 6 IC LP38691SD-3.3/NOPB NAT Linear Regulator, 3.3V, LLP6, Pb-Free 1 X U2 0 7 IC PGB1040805 LF ESD Suppressor, 0805, Pb-Free 1 X U4 0 ERJ-3GEY0R00 PANA 0 Ohm 1/10W 5% 0603, Pb-Free 3 X R4,5,14 0 <ALT> CRCW06030000Z0EA VISHAY 0 Ohm 1/10W 5% 0603, Pb-Free <ALT> MCR03EZPJ000 ROHM 0 Ohm 1/10W 5% 0603, Pb-Free <ALT> RC0603JR-070RL YAGEO 0 Ohm 1/10W 5% 0603, Pb-Free 5 X R3,8-9,12,13 0 2 X R1-2 0 2 X R6,7 0 2 X R10-11 0 1 U5 Customer Supplied 0 8 9 RES 10 RES ERJ-3GEYJ103 PANA 10K 1/10W 5% 0603 200ppm, Pb-Free <ALT> CRCW060310K0JNEA VISHAY 10K 1/10W 5% 0603 200ppm, Pb-Free <ALT> RK73B1JTTD103J KOA 10K 1/10W 5% 0603 200ppm, Pb-Free ERJ-3GEYJ220 PANA 22 Ohm 1/10W 5% 0603 200ppm, Pb-Free CRCW060322R0JNEA VISHAY 22 Ohm 1/10W 5% 0603 200ppm, Pb-Free 11 RES <ALT> <ALT> 12 RES <ALT> <ALT> 13 RES RK73B1JTTD220J KOA 22 Ohm 1/10W 5% 0603 200ppm, Pb-Free ERJ-3GEYJ222 PANA 2.2K 1/10W 5% 0603 200ppm, Pb-Free CRCW06032K20JNEA VISHAY 2.2K 1/10W 5% 0603 200ppm, Pb-Free RK73B1JTTD222J KOA 2.2K 1/10W 5% 0603 200ppm, Pb-Free ERJ-8GEY0R00 PANA 0 Ohm 1/4W 5% 1206, Pb-Free 1:12:35 PM, 4/20/2007 Confidential and Proprietary. This document is considered uncontrolled unless stamped otherwise. Page 1 of 3 ENERCON - BILL OF MATERIALS TITLE: Main Product: NATIONAL SEMICONDUCTOR PCBA, DS25CP104EVK, ROHS Rev: Rev By: Rev Date: PL Number: Z3071-01 0 Responsible Eng/Mgr: PCBA, DS25CP104 EVK Item Part Type <ALT> Part Number/Value Mfg NoSub Description CRCW12060000Z0EA VISHAY 0 Ohm 1/4W 5% 1206, Pb-Free 0402YC103KAT AVX .01F, 16V, 10%, 0402, Ceramic, X7R, Pb-Free <ALT> C0402C103K4RAC KEMET .01F, 16V, 10%, 0402, Ceramic, X7R, Pb-Free <ALT> ECJ-0EB1C103K PANA .01F, 16V, 10%, 0402, Ceramic, X7R, Pb-Free 08055A180JAT AVX 18pF, 50V, 5%, 0805, Ceramic, NP0, PbFree <ALT> C0805C180J5GAC KEMET 18pF, 50V, 5%, 0805, Ceramic, NP0, PbFree <ALT> ECJ-2VC1H180J PANA 18pF, 50V, 5%, 0805, Ceramic, NP0, PbFree 17 CAP C0402C104K8RAC KEMET .1F, 10V, 10%, 0402, Ceramic, X7R, PbFree 18 CAP C1206C225K4RAC KEMET 2.2F, 16V, 10%, 1206, Ceramic, X7R, Pb-Free ECJ-3YB1C225K PANA 2.2F, 16V, 10%, 1206, Ceramic, X7R, Pb-Free MMZ1608R301A TDK HCM49-24.000MABJ Qty Released Creator: Creation Date: Arlene Fox 3/28/2007 Ref Des SMT PL Status: 3/28/2007 Notes Rev 14 15 CAP 2 X C15,17 0 2 X C11-12 0 10 X C1,4-8,10,1314,16 0 4 X C2,3,9,18 0 Ferrite, 300 Ohm, .5A, 0603, Pb Free 2 X FB1-2 0 CITIZEN Crystal, 24.0000MHz, SMD, 18pF, Pb-Free 1 X Y1 0 1206L050 LF .5A, Resettable, SMT, .09 Ohms, Pb Free 1 X F1 0 26 CONN 1287-ST KEYSTONE Faston, Male, .250x.032, Pb-Free 2 J25-26 0 27 CONN 142-0701-851 EMERSON SMA, Jack Receptacle, 50 OHM, Pb-Free SMA1-28 0 28 CONN 61729-0010 FCI USB-B, 4p, R/A, Pb-Free 1 J1 0 29 CONN TSW-102-07-G-S SAMTEC Header, 2p, Male, .100"sp, Gold, Pb-Free 2 J3-4 0 30 CONN TSW-103-07-G-S SAMTEC Header, 3p, Male, .100"sp, Gold, Pb-Free 18 J7-24 0 16 CAP <ALT> 19 20 FILTER 21 22 XTAL 23 24 FUSE 25 1:12:35 PM, 4/20/2007 28 Confidential and Proprietary. This document is considered uncontrolled unless stamped otherwise. Page 2 of 3 ENERCON - BILL OF MATERIALS TITLE: Main Product: NATIONAL SEMICONDUCTOR PCBA, DS25CP104EVK, ROHS Rev: Rev By: Rev Date: PL Number: Z3071-01 0 Responsible Eng/Mgr: PCBA, DS25CP104 EVK Item Part Type 31 CONN Part Number/Value Mfg NoSub Description Qty Released Creator: Creation Date: Arlene Fox 3/28/2007 Ref Des SMT PL Status: 3/28/2007 Notes J2 Rev TSW-105-07-G-S SAMTEC Header, 5p, Male, .100"sp, Gold, Pb-Free 1 0 T-05889R0 ENERCON STENCIL FABRICATION, TOP, DS25CP104EVK 1 0 T-05890R0 ENERCON STENCIL FABRICATION, BOTTOM, DS25CP104EVK 1 0 36 REF C-05886R0 ENERCON FABRICATION DWG, DS25CP104EVK 0 37 REF C-05888R0 ENERCON PALLET DWG, DS25CP104EVK 0 38 REF S-05887R0 ENERCON SCHEMATIC, DS25CP104EVK 0 32 33 STENCL 34 STENCL 35 39 40 41 Notes: DO NOT STUFF: R15,16,17,18,19 J5,6 1:12:35 PM, 4/20/2007 Confidential and Proprietary. This document is considered uncontrolled unless stamped otherwise. Page 3 of 3 Note: This document is considered uncontrolled unless stamped otherwise. Note: This document is considered uncontrolled unless stamped otherwise. Note: This document is considered uncontrolled unless stamped otherwise. Note: This document is considered uncontrolled unless stamped otherwise. Note: This document is considered uncontrolled unless stamped otherwise. Note: This document is considered uncontrolled unless stamped otherwise. Note: This document is considered uncontrolled unless stamped otherwise. Note: This document is considered uncontrolled unless stamped otherwise. Note: This document is considered uncontrolled unless stamped otherwise. Note: This document is considered uncontrolled unless stamped otherwise. Note: This document is considered uncontrolled unless stamped otherwise. Note: This document is considered uncontrolled unless stamped otherwise. Note: This document is considered uncontrolled unless stamped otherwise. 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