Texas Instruments 3.125 Gbps 4x4 LVDS Crosspoint Switch Evaluation Board User guide

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


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 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


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.

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


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 Setting Note

SMBus Enable L Disable SMbus

EQ0 – EQ 3 L Equalization off,

See table

PE0 – PE3 L

H

Pre-Emphasis off,

See table

Power Down off PWDN

Switch Configuration Truth Tables

Table 1. Input Select Pins Configuration for the Output OUT0


Page 6 of 17




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

Stripline

0 Off

1 Low

Table 6. Receive Equalization Truth Table

Stripline Length Table (also known as Test Channels)

Length Loss (dB) @ 1250 MHz

Table 7. Stripline length table

Page 7 of 17


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


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.




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


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.




6.





Figure 6. Equalization Performance Test Circuit

Page 10 of 17


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.




6.





TEST

CHANNEL

DS25CP104EVK

TEST

CHANNEL

50

Microstrip

L=4"

¼ DS25CP104 50

Microstrip

L=4"

PATTERN

GENERATOR

OSCILLOSCOPE

L=4"

50

Microstrip

L=4"

50

Microstrip

Figure 7. Pre-emphasis and Equalization Performance Test Circuit

Page 11 of 17


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 1 st

time the application is run on a PC, and only the 1 st

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

H inserted

Enables the SMBus

USB Controller Reset

J18, J19

J24, J22 removed S00 (SCL), S01 (SDA)

L Address

H Address

J20, J23 L

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


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


Page 14 of 17


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


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


• 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.


ENERCON -

BILL OF MATERIALS

Main Product:

PCBA, DS25CP104 EVK

TITLE:

Item Part Type

1 PCB

Part Number/Value

P-05885R0

Mfg

NATIONAL SEMICONDUCTOR

PCBA, DS25CP104EVK, ROHS

NoSub

Description

DS25CP104EVK: 5.25x5.25x.060in, 8 layer

PL Number:

Z3071-01

Qty

SMT

1

Rev: Rev By:

0

Rev Date:

3/28/2007

Responsible Eng/Mgr: Creator:

Arlene Fox

Ref Des

PL Status:

Released

Creation Date:

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

4 IC

5 IC

6 IC

7 IC

8

9 RES

<ALT>

<ALT>

<ALT>

10 RES

<ALT>

<ALT>

11 RES

<ALT>

<ALT>

12 RES

<ALT>

<ALT>

13 RES

24LC128-I/SN

CY7C68013A-56LFXC

DS25CP104

LP38691SD-3.3/NOPB

PGB1040805

ERJ-3GEY0R00

CRCW06030000Z0EA

MCR03EZPJ000

RC0603JR-070RL

ERJ-3GEYJ103

CRCW060310K0JNEA

RK73B1JTTD103J

ERJ-3GEYJ220

CRCW060322R0JNEA

RK73B1JTTD220J

ERJ-3GEYJ222

CRCW06032K20JNEA

RK73B1JTTD222J

ERJ-8GEY0R00

MICROCHIP

CYPRESS

NAT

NAT

LF

PANA

VISHAY

ROHM

YAGEO

PANA

VISHAY

KOA

PANA

VISHAY

KOA

PANA

VISHAY

KOA

PANA

128K bit Serial EEPROM 2.5V, SOIC8, Pb-

Free

EZ-USB FX2 USB Microcontroller, QFN56,

Pb-Free

Linear Regulator, 3.3V, LLP6, Pb-Free

ESD Suppressor, 0805, Pb-Free

0 Ohm 1/10W ±5% 0603, Pb-Free

0 Ohm 1/10W ±5% 0603, Pb-Free

0 Ohm 1/10W ±5% 0603, Pb-Free

0 Ohm 1/10W ±5% 0603, Pb-Free

10K 1/10W ±5% 0603 200ppm, Pb-Free

10K 1/10W ±5% 0603 200ppm, Pb-Free

10K 1/10W ±5% 0603 200ppm, Pb-Free

22 Ohm 1/10W ±5% 0603 200ppm, Pb-Free

22 Ohm 1/10W ±5% 0603 200ppm, Pb-Free

22 Ohm 1/10W ±5% 0603 200ppm, Pb-Free

2.2K 1/10W ±5% 0603 200ppm, Pb-Free

2.2K 1/10W ±5% 0603 200ppm, Pb-Free

2.2K 1/10W ±5% 0603 200ppm, Pb-Free

0 Ohm 1/4W ±5% 1206, Pb-Free

1 X U3

1 X U1

1 U5

1 X

1 X

U2

U4

3 X R4,5,14

5 X R3,8-9,12,13

2 X R1-2

2 X R6,7

2 X R10-11

Customer

Supplied

0

0

0

0

0

0

0

0

0

0

1:12:35 PM, 4/20/2007 Confidential and Proprietary. This document is considered uncontrolled unless stamped otherwise.

Page 1 of 3

ENERCON -


Main Product:


TITLE:

Item Part Type

<ALT>

Part Number/Value

CRCW12060000Z0EA

14

15 CAP 0402YC103KAT

Mfg

VISHAY

AVX



NoSub

Description

0 Ohm 1/4W ±5% 1206, Pb-Free

<ALT>

<ALT>

16 CAP

<ALT>

<ALT>

17 CAP

18 CAP

<ALT>

C0402C103K4RAC

ECJ-0EB1C103K

08055A180JAT

C0805C180J5GAC

ECJ-2VC1H180J

C0402C104K8RAC

C1206C225K4RAC

ECJ-3YB1C225K

KEMET

PANA

AVX

KEMET

PANA

KEMET

KEMET

PANA

.01µF, 16V, ±10%, 0402, Ceramic, X7R,

Pb-Free

.01µF, 16V, ±10%, 0402, Ceramic, X7R,

Pb-Free

.01µF, 16V, ±10%, 0402, Ceramic, X7R,

Pb-Free

18pF, 50V, ±5%, 0805, Ceramic, NP0, Pb-

Free

18pF, 50V, ±5%, 0805, Ceramic, NP0, Pb-

Free

18pF, 50V, ±5%, 0805, Ceramic, NP0, Pb-

Free

.1µF, 10V, ±10%, 0402, Ceramic, X7R, Pb-

Free

2.2µF, 16V, ±10%, 1206, Ceramic, X7R,

Pb-Free

2.2µF, 16V, ±10%, 1206, Ceramic, X7R,

Pb-Free

19

20 FILTER MMZ1608R301A

21

HCM49-24.000MABJ

22 XTAL

23

1206L050 24 FUSE

25

26 CONN

27 CONN

28 CONN

29 CONN

30 CONN

1287-ST

142-0701-851

61729-0010

TSW-102-07-G-S

TSW-103-07-G-S

TDK

CITIZEN

LF

KEYSTONE

EMERSON

FCI

SAMTEC

SAMTEC

Ferrite, 300 Ohm, .5A, 0603, Pb Free

Crystal, 24.0000MHz, SMD, 18pF, Pb-Free

.5A, Resettable, SMT, .09 Ohms, Pb Free

Faston, Male, .250x.032, Pb-Free

SMA, Jack Receptacle, 50 OHM, Pb-Free

USB-B, 4p, R/A, Pb-Free

Header, 2p, Male, .100"sp, Gold, Pb-Free


PL Number:

Z3071-01

Rev: Rev By:

0

Rev Date:

3/28/2007


Arlene Fox

Qty

SMT

Ref Des

PL Status:

Released

Creation Date:

3/28/2007

Notes

Rev

2 X C15,17

2 X C11-12

10 X

4 X

C1,4-8,10,13-

14,16

C2,3,9,18

2 X FB1-2

1 X Y1

1 X F1

2

28

1

2

18

J25-26

SMA1-28

J1

J3-4

J7-24

0

0

0

0

0

0

0

0

0

0

0

0


Page 2 of 3

ENERCON -


Main Product:


TITLE:

Item Part Type Part Number/Value

TSW-105-07-G-S 31 CONN

32

33 STENCL T-05889R0

34 STENCL T-05890R0

Mfg

SAMTEC

ENERCON

ENERCON



PL Number:

Z3071-01

Rev: Rev By:

0

Rev Date:

3/28/2007


Arlene Fox

NoSub

Description


Qty

SMT

1 J2

Ref Des

PL Status:

Released

Creation Date:

3/28/2007

Notes

Rev

0

STENCIL FABRICATION, TOP, DS25CP104EVK

STENCIL FABRICATION, BOTTOM,

DS25CP104EVK

1

1

0

0

35

36 REF

37 REF

38 REF

39

40

41

C-05886R0

C-05888R0

S-05887R0

ENERCON

ENERCON

ENERCON

FABRICATION DWG, DS25CP104EVK

PALLET DWG, DS25CP104EVK

SCHEMATIC, DS25CP104EVK

0

0

0

Notes:

DO NOT STUFF:

R15,16,17,18,19

J5,6


Page 3 of 3















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Texas Instruments 3.125 Gbps 4x4 LVDS Crosspoint Switch Evaluation Board User guide

3.125 Gbps 4x4 LVDS Crosspoint Switch with Transmit Pre-emphasis and Receive Equalization

DS25CP104 Evaluation Kit

USER MANUAL

Table of Contents

Overview

DS25CP104EVK Description

DS25CP104 Evaluation

SMBus Evaluation

•

• Typical Performance

Related manuals

Texas Instruments 3.125 Gbps 4x4 LVDS Crosspoint Switch Evaluation Board User guide

3.125 Gbps 4x4 LVDS Crosspoint Switch with Transmit Pre-emphasis and Receive Equalization

DS25CP104 Evaluation Kit

USER MANUAL

Table of Contents

Overview

DS25CP104EVK Description

DS25CP104 Evaluation

SMBus Evaluation

•

• Typical Performance

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