Texas Instruments SN65LV1021 Manuale utente

User's Guide

May 2, 2002

11/06/09

SN65LV1021/SN65LV1212- SN65LV1023/SN65LV1224

10:1 Serializer/Deserializer Evaluation Board (EVM)

ABSTRACT

This application report focuses the use and construction of a Serializer/Deserializer evaluation module

(EVM) constructed to evaluate the characteristics of SN65LV1021/SN65LV1212 Serializers, and

SN65LV1023/SN65LV1224 Deserializer devices. This document provides guidance on proper use by

showing possible device configurations and test modes. It also provides design, layout, and schematic

information, including specific construction recommendations. Information in this guide can be used to

assist the customer in choosing the optimal design methods and materials in designing a complete

system.

SLLU193 - May 2002

User's Guide

May 2, 2002

11/06/09

TABLE OF CONTENTS

EVM DESCRIPTION................................................................................................................................................. 3

Figure 1- B LINK Evaluation Board Block Diagram.......................................................................................... 4

Board Configuration.................................................................................................................................................... 4

EVM Board Preparation.............................................................................................................................................. 5

Figure 2- B LINK EVM Default Jumpers Setup................................................................................................. 5

Figure 3 – Deserializer-Serializer Interconnect Detail....................................................................................... 5

Table 1- Jumpers Installation Table ................................................................................................................... 6

Power Connections...................................................................................................................................................... 7

Basic Evaluation Setup................................................................................................................................................ 7

Figure 4 - Basic Evaluation Setup....................................................................................................................... 8

Optional Configurations and Measurements............................................................................................................... 8

Parallel Input and Output Data Set-up /Hold Setup .................................................................................................... 8

Serializer Jitter Measurements..................................................................................................................................... 9

Average Current Measurements.................................................................................................................................. 9

PC Board Physical Layout Recommendations................................................................................................... 10

Figure 7 - SN65LVDS1023/SN65LVDS1224 Layout Requirements Diagram at a Glance............................. 10

Appendix A ............................................................................................................................................................... 11

BLINK Schematics............................................................................................................................................ 11

Appendix B................................................................................................................................................................ 12

EVM Board Design Stackup ............................................................................................................................ 12

EVM Board Design – Top & Bottom Silkscreens............................................................................................. 13

EVM Board Design – Top Layer– Ground Layer............................................................................................ 14

EVM Board Design Power Voltage Layers....................................................................................................... 15

EVM Board Design – Ground Layer & Bottom Layer ..................................................................................... 16

Appendix C-.............................................................................................................................................................. 17

BLINK EVM BOM........................................................................................................................................... 17

SLLU193 - May 2002

User's Guide

May 2, 2002

11/06/09

EVM DESCRIPTION

The BLINK EVM provides a vehicle to evaluate the operation and conduct characterization measurements

of Texas Instruments SN65LVDS1021/1023 Serializer and SN65LVDS1212/1224 Deserializer devices.

The board is setup to permit the independent evaluation of either Serializer or Deserializer devices through

the use of external equipment to match the requirements of each device.

Design of the board provides for easy configuration changes that permit joining the devices at either their

parallel ports or serial ports thus providing a vehicle for the evaluation of that interface between the two

devices.

Standard SMA and RJ45 female connectors are provided to permit the serializing and data recovery

evaluation utilizing standard interface cables of various lengths. A patch resistor network is permits

selection of either set of connectors as it might be appropriate for evaluation and measurement of these

signals.

Standard board shorting jumpers and be used to interconnect Deserializer to Serializer devices through the

use of standard board-pin headers. These same headers provide a vehicle to interface with logic analyzers

and pattern generators for the purpose of evaluating these devices.

Other configuration jumpers within the board permit the establishment of independent measurements loops

for supply currents and or injection of separate external supplies sources.

SLLU193 - May 2002

User's Guide

May 2, 2002

11/06/09

DESERIALIZER SERIALIZER

SMA / RJ45

Select SMA / RJ45

SELECT

Parallel

outputs Parallel

Inputs

SERDES INPUT

REFCLK

SERDES OUTPUT

RJ-45 Cat 5

SERDES INPUT POWER

CONDITION POWER

CONDITION

3.3v +/-10%

Figure 1- B LINK Evaluation Board Block Diagram

Board Configuration

The B LINK evaluation board can be configured to permit independent evaluation of either Serializer or Deserializer

devices or joined in cooperation with each other as a pair. It is possible, through jumper configurations, to set up the

board to perform DC and AC measurements such that only one of the devices is active while the other is taken totally out

of the circuit without being an influence on the other. Both devices can be easily interfaced with the other by joining their

high-speed side through cables or their low speed side through jumpers. This feature can be used to evaluate how each

device interfaces with the other or each device as a stand alone through the use of external laboratory test equipment.

Table 1, corresponds to the way the board was configured prior to shipment from TI.

Figure 2, provides a simplified pictorial representation of the EVM and can be used to rapidly locate the jumper locations

on the board.

Deserializer receive outputs and Serializer receive inputs are routed to terminal blocks BS3 and BS4, respectively. Figure

3 provides a additional information that may be used to identify signal distribution on the BS3 and BS4 terminal blocks.

These terminal blocks provide a mechanism for connection to stimulus and measurement systems for parallel data timing

control and evaluation. These terminal blocks provide a means for a simple interconnection of Deserializer and Serializer

devices. The signals on these headers are set such that all pins on the outer edges of the header-group are grounds, while

all signals output from the Deserializer and input to the Serializer are contained in the inner rows. This setup is easily

connected to stimulus measurement s and data pattern generation hardware and it also allows for the easy interconnect of

the parallel busses through standard 0.1 inch shorting jumpers.

SLLU193 - May 2002

User's Guide

May 2, 2002

11/06/09

EVM Board Preparation

Prior to applying power to the board verify that jumpers are properly installed as shown in Table 1-

Jumpers Installation Table. Figure 2, provides a simplified top view of the EVM that can be used to assist in rapidly

locating these jumpers on the board.

RJ45

/PWRDN

/REN

DEN

TCLK_R/F SEROUT-

SEROUT+

/PWRDN

RCLK_R/F

JP9

SYNC2

REF CLK IN

SERIN-

SERIN+

DESERIALIZER SERIALIZER

JP7

JP8

JP6

JP5

J10

J2 JP3

JP2

BS3 BS4

JP11

JP13 JP12

JP14

VCC GND

3.3 vdc

SYNC1

TITEN1

JP16

TITEN2

Figure 2- B LINK EVM Default Jumpers Setup

1 1

BS3 BS4

ROUT0

ROUT1

ROUT2

ROUT3

ROUT4

ROUT5

ROUT6

ROUT7

ROUT9

LOCK

RCLK

DIN0

DIN1

DIN2

DIN3

DIN4

DIN5

DIN6

DIN7

DIN8

DIN9

TCLK

DeSerializer Serializer

SYNC1 SYNC2

JP9 JP8

Figure 3 – Deserializer-Serializer Interconnect Detail

SLLU193 - May 2002

User's Guide

May 2, 2002

11/06/09

Jumper Default Pin # Function Description

JP1 Installed 2-3 RCLK_R/F Deserializer’s RCLK strobe edge selection (high selects rising edge)

JP2 Installed 2-3 REN Logic high input enables Deserializer’s parallel output bus and RCLK into

Lo-Z states

JP3 Installed 2-3 /PWRDN Deserializer Power-down control. Set to high input to maintain device active

JP5 Installed 2-3 TCLK_R/F Serializer’s TCLK strobe edge selection (high selects rising edge )

JP6 Installed 1-2 DEN Serializer output bus tri-state control. Set high enables serializer’s output pair

JP7 Installed 1-2 /PWRDN Deserializer Power-down control. Set to high input to maintain device

active.

JP8 OFF SYNC2

JP9 OFF SYNC1

Logic high initiates serializer’s 1024 sync patterns for rapid synchronization.

May be connected to the Serializers LOCK to speed synchronization.

JP11 Installed 1-2 Power Digital Power In. to Deserializer pins12 and 23

JP12 Installed 1-2 Power Digital Power In to Serializer pins 27 and 28

JP13 Installed 1-2 Power Analog Power In to Deserializer pins 4 and 11

JP14 Installed 1-2 Power Analog Power In to Serializer pins 17 and 26

JP15 Installed 1-2 TITEN1 TI Factory Test Enable 1

JP16 Installed 2-3 TITEN2 TI Factory Test Enable 2.

BS3>BS4 Installed BS3-26>BS4-1 Data0 ROUT0 > DIN0

BS3>BS4 Installed BS3-25>BS4-2 Data1 ROUT1 > DIN0

BS3>BS4 Installed BS3-24>BS4-3 Data2 ROUT2 > DIN0

BS3>BS4 Installed BS3-23>BS4-4 Data3 ROUT3 > DIN0

BS3>BS4 Installed BS3-22>BS4-5 Data4 ROUT4 > DIN0

BS3>BS4 Installed BS3-21>BS4-6 Data5 ROUT5 > DIN0

BS3>BS4 Installed BS3-20>BS4-7 Data6 ROUT6 > DIN0

BS3>BS4 Installed BS3-19>BS4-8 Data7 ROUT7 > DIN0

BS3>BS4 Installed BS3-18>BS4-9 Data8 ROUT8 > DIN0

BS3>BS4 Installed BS3-17>BS4-10 Data9 ROUT9 > DIN0

BS3>BS4 OFF BS3-16>BS4-11 Lock Deserializer LOCK test point

BS3>BS4 Installed BS3-15>BS4-12 Clock ROUT0 > DIN0

BS3>BS4 OFF BS3-14>BS4-13 Ground Ground

Table 1- Jumpers Installation Table

SLLU193 - May 2002

User's Guide

May 2, 2002

11/06/09

Power Connections

The B LINK EVM can be powered from an ordinary DC laboratory bench power supply through the assist of a pair of

power supply cables with standard plug banana jacks.

•Set the power supply at 3.3 Vdc +/- 10%

•It is recommended that before making the power supply connections, the power supply be turned off

•Apply 3.3 volt jumper plug to EVM connector J6

•Apply Ground connection to EVM connector J7

•Application of power is indicated by an LED between the terminal posts.

It is advisable to maintain the power supply off until all SMA connections are made to preclude accidental shorting of

coaxial connectors with power jacks.

Basic Evaluation Setup

As shipped, the board is ready for operation. Jumpers interconnecting BS3 and BS4 have been installed, which connect

the parallel output bus from the Deserializer to the parallel input bus on the Serializer. Jumpers J11-J14 provide digital

and analog power to both devices. The board is configured to be in the active powered state with all data outputs enabled,

and jumpers installed for selecting the rising edge of the strobe clock . Once interconnected with test equipments as shown

in Figure 4, the board is ready for power application and evaluation.

The basic setup takes serial data applied through a serial BERT at the J1-J2 SMA connectors (or alternately RJ45

connector at J6)1; data and clock , recovered at the Deserializer device, are output on the BS3 header. Jumpers

interconnecting BS3 and BS4 provide parallel data and clock to the Serializer device, where data will is serialized and

output at J3-J4 SMA connectors.

An optional jumper wire, interconnecting the Deserializer’s LOCK output available at BS3-12 to pin 2 on JP8 or JP9

might be used to activate the rapid sync pattern generation option in the Serializer, the LOCK signal will go active low

indicating that the Deserializer has locked onto the input data stream and command the Serializer to resume with normal

data transmission.

Care should be taken to use matched electrical length cables for matched pair signals from and to a BERT or Scope to

ensure the quality of measurements.

This setup can be used to verify the functional integrity and operation of the devices, evaluate lock time, jitter transfer and

most timing parameters. The setup can with little modification be converted to effect other jitter evaluation and timing

measurements for both serializer and deserializer devices.

1Zero Ohm steering resistors installed R2, R4, R19 and R21 steer data to SMA connectors while moving these resistors to

R1, R2, R19&R20 makes serial data available at RJ45 connectors. Installing shorting bars in all resistor positions will

make the signal available at both; however reflections may occur on serial data streams due to stub effects.

SLLU193 - May 2002

User's Guide

May 2, 2002

11/06/09

RJ45

/PWRDN

/REN

DEN

TCLK_R/F SEROUT-

SEROUT+

/PWRDN

RCLK_R/F

JP9

SYNC2

REF CLK IN

SERIN-

SERIN+

DESERIALIZER SERIALIZER

JP7

JP8

JP6

JP5

J10

J2 JP3

JP2

BS3 BS4

JP11

JP13 JP12

JP14

VCC GND

3.3 vdc

SYNC1

TITEN1

JP16

TITEN2

CSA8000

8E04 Module 8E01 Module

71200A BERT

Error Detector

Clk In Data In

Clk In

Trig

Pattern Generator

Data Out

Clk Out

Clk Out Alt Word 10 Mhz Ref

Clock Mod In

Clock Module

3.3V

Pulse Generator

Ch2 Ch2 Trig Out Ch 1 Ch 1

Ext Trig

8662/4A

Mod In RF Out

10 Mhz

Ref Out

Freq= 66MHz.

TO CSA 8000 OR

BER TESTER

Figure 4 - Basic Evaluation Setup

Optional Configurations and Measurements

The fact that each of the devices operational pins are accessible at test pins or connectors facilitates the evaluation of each

device as stand alone unit under test to evaluate other devise parameters such as setup, hold, Lock time etc. without

influence from the other device.

Parallel Input and Output Data

The jumpers that interconnect the parallel busses of Deserializer and Serializer devices in the “as shipped configuration”

are removed. Parallel data inputs to the Serializer device are provided at the BS4 header by an external parallel data

generator. Data is serialized by the Serializer device and externally directed to the Deserializer inputs through SMA or

RJ45 connections. The verification loop is completed by monitoring the parallel output of the Serializer at the BS3 header

through a pattern verification unit that compares sent and received data.

•Jumpers that connect BS3 to BS4 are removed.

•BS4 parallel input data to the Serializer connected to a parallel pattern generator,

•BS3 Parallel outputs are connected to A parallel pattern verification unit, Set-up /Hold Setup

•Loopback of serial ports is effected by connecting J3-J1 and J4-J2 through matched length 50 Ohm cables.2

2Optionally J10 can loop the serial stream to J9 RJ45 connectors through the use of a standard Ethernet 10/100BASE-TX

NIC-to-Hub cable

SLLU193 - May 2002

User's Guide

May 2, 2002

11/06/09

Serializer Jitter Measurements

Patterns can be introduced in several ways to provide input to the serializer.

•In the EVM’s default configuration setup, a serial data stream can be provided to create these patterns.

•If all the jumper interconnecting the BS3 BS4 headers are removed data and clock can be provided at BS4.

•An alternate method of generating fixed patterns when a Parallel data generation capability is not available is to

utilize jumpers from the data input connection to the adjacent ground posts on the BS4 Header. Since all data

inputs to the serializer are pulled-up, only those bits where a jumper is installed to the adjacent ground become

zero.

Average Current Measurements

Power is individually steered to Serializer and Deserializer devices by installed Jumpers JP11-JP14 as described in Table

1. In order to make individual device current measurements , jumpers could be replaced with current probes or replaced

with a small value resistors to facilitate the current calculation. These jumpers are located on top of the board

immediately below the power connectors to the EVM. Once jumpers are replaced with current measurement

replacements, appropriate data patterns and speed selection need to be provided to validate those measurements.

SLLU193 - May 2002

User's Guide

May 2, 2002

11/06/09

PC Board Physical Layout Recommendations

Serializer and De-Serializer devices should be provided with separate analog and digital power planes; these can co-exist

within the same PWB layer and share a common ground where the analog and digital ground pins of each device may be

joined.

In order to provide good power supply bypass and provide for the demand currents whose harmonics may reach into the

many gigahertz region an appropriate power distribution system should be designed consisted of tantalum capacitors, high

quality local capacitors should be placed in the immediate vicinity of power pins. Good interplane capacitance should be

provided on this system utilizing power cores 0.005 inches or less.

All active signals should be laid out as 50 ohm characteristic impedance traces utilizing high speed layout techniques.

Serial data pairs should be electrically matched to within .050 inches, and laid out to provide 100 Ohm differential

common mode impedance. A 100 Ohm termination resistor should be placed as close as to the sourcing pins on the

serializer and to the receiving pins of the deserializer devices.

Figure 7 provides a graphical representation of the layout requirements for these devices.

SN65LVDS1023

DO+

DO-

AVCC

DVCC

AGND/

DGND

DINxx

TCLK

50 OHM

CHARATERISTIC

IMPEDANCE TRACES

50 OHM CHARACTERISTIC

IMPEDANCE TRACES100 OHM

COMMON MODE IMPEDANCE

.1 .1

3.3 vdc

3.3 AVCC PLANE

CORE LE 0.005"

3.3 DVCC PLANE

CORE LE 0.005"

COMBINED ANALOG

DIGITAL GROUND PLANE

SN65LVDS1224

.1.1

3.3 vdc

3.3 AVCC PLANE

CORE LE 0.005"

3.3 DVCC PLANE

CORE LE 0.005"

COMBINED ANALOG

DIGITAL GROUND PLANE

DVCC

AGND/

DGND

AVCC

RCLK

ROUTx 50 OHM

CHARATERISTIC

IMPEDANCE TRACES

REFCLK

100

Figure 7 - SN65LVDS1023/SN65LVDS1224 Layout Requirements Diagram at a Glance

SLLU193 - May 2002

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