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National Semiconductor DS25CP104 User Manual
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National Semiconductor DS25CP104 User Manual

3.125 gbps 4x4 lvds crosspoint switch with transmit pre-emphasis and receive equalization
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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

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Summary of Contents for National Semiconductor DS25CP104

  • Page 1: User Manual

    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.

  • Page 2: Table Of Contents

    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...

  • Page 3: 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”...

  • Page 4: Ds25Cp104Evk Description

    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...
  • Page 5 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 –...

  • Page 6: Cp104 Evaluation

    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.
  • Page 7 DS25CP104EVK User Manual Input Selected Table 3. Input Select Pins Configuration for the Output OUT2 Input Selected 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 Medium Table 5.
  • Page 8 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.
  • Page 9 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.
  • Page 10 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.
  • Page 11 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.

  • Page 12: Smbus Evaluation

    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 1...
  • Page 13 “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.
  • Page 14 DS25CP104EVK User Manual Page 14 of 17...
  • Page 15 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.
  • Page 16 • 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.

  • Page 17: 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 The DS25CP104 3.125 Gbps PRBS-7 output eye diagram with no STRIPLINE connected and with diagram after the STRIPLINE 1 (15”...
  • Page 18 Note: This document is considered uncontrolled unless stamped otherwise.
  • Page 19 Note: This document is considered uncontrolled unless stamped otherwise.
  • Page 20 TITLE: NATIONAL SEMICONDUCTOR BILL OF MATERIALS Z3071-01 3/28/2007 Released PCBA, DS25CP104EVK, ROHS Main Product: Responsible Eng/Mgr: Creator: Creation Date: PCBA, DS25CP104 EVK Arlene Fox 3/28/2007 Item Part Type Part Number/Value Description Ref Des Notes NoSub Bd: (133.35x 1 PCB P-05885R0 DS25CP104EVK: 5.25x5.25x.060in, 8 layer...
  • Page 21 ENERCON - TITLE: NATIONAL SEMICONDUCTOR BILL OF MATERIALS Z3071-01 3/28/2007 Released PCBA, DS25CP104EVK, ROHS Main Product: Responsible Eng/Mgr: Creator: Creation Date: PCBA, DS25CP104 EVK Arlene Fox 3/28/2007 Item Part Type Part Number/Value Description Ref Des Notes NoSub <ALT> CRCW12060000Z0EA VISHAY 0 Ohm 1/4W ±5% 1206, Pb-Free...
  • Page 22 ENERCON - TITLE: NATIONAL SEMICONDUCTOR BILL OF MATERIALS Z3071-01 3/28/2007 Released PCBA, DS25CP104EVK, ROHS Main Product: Responsible Eng/Mgr: Creator: Creation Date: PCBA, DS25CP104 EVK Arlene Fox 3/28/2007 Item Part Type Part Number/Value Description Ref Des Notes NoSub 31 CONN TSW-105-07-G-S SAMTEC Header, 5p, Male, .100"sp, Gold, Pb-Free...
  • Page 23 Note: This document is considered uncontrolled unless stamped otherwise.
  • Page 24 Note: This document is considered uncontrolled unless stamped otherwise.
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  • Page 31 Note: This document is considered uncontrolled unless stamped otherwise.
  • Page 32 Note: This document is considered uncontrolled unless stamped otherwise.
  • Page 33 Note: This document is considered uncontrolled unless stamped otherwise.
  • Page 34 Note: This document is considered uncontrolled unless stamped otherwise.
  • Page 35 Note: This document is considered uncontrolled unless stamped otherwise.
  • Page 36 Note: This document is considered uncontrolled unless stamped otherwise.