Texas Instruments DS125BR111EVM Manual de usuario

DS125BR111EVM User's Guide

SMA Evaluation Kit

User's Guide

Literature Number: SNLU168A

August 2014–Revised August 2014

User's Guide

SNLU168A–August 2014–Revised August 2014

DS125BR111EVM User's Guide

SMA Evaluation Kit

The DS125BR111EVM – SMA evaluation kit provides a complete high bandwidth platform to evaluate the

10GbE, PCIe, and SAS/SATA signal conditioning features of the Texas Instruments DS125BR111

repeater/redriver. The DS125BR111EVM can be used for standard compliance testing, performance

evaluation, and initial system prototyping. The SMA edge launch connectors used for the

DS125BR111EVM will interface to multiple system connector types via commercially available breakout

cables, adaptors, and boards (not included). This flexible connectivity enables integrated system level

testing between TI repeaters and 3rd party ASIC/FPGA host boards.

Topic ........................................................................................................................... Page

1 Features ............................................................................................................. 3

2 Applications........................................................................................................ 3

3 Demo Kit Contents............................................................................................... 3

4 Ordering Information............................................................................................ 3

5 Evaluation Board ................................................................................................. 4

6 Setup.................................................................................................................. 4

7 Expected Results................................................................................................. 7

8 Schematic........................................................................................................... 8

9 Bill of Materials.................................................................................................. 10

2DS125BR111EVM User's Guide SMA Evaluation Kit SNLU168A–August 2014–Revised August 2014

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Features

1 Features

• Two Channel Repeater up to 12 Gbps Rate

– DS125BR111: 1x Bidirectional Lane

• Low 65mW/channel Power Consumption, with Option to Power Down Unused Channels

• Advanced Signal Conditioning Features

– Linear Equalization (up to 10 dB @ 6 GHz)

– Linear output drive

– Output voltage range over 1200 mV

• Fully Programmable via Pin Selection or SMBus Interface

• Selectable Single Supply Operation

• 5 kV HBM ESD Rating

• 3.3 V LVCMOS Input Tolerant for SMBus Interface

• Flow–Thru Pinout Package: 24-Pin QFN (4 mm x 4 mm)

• Industrial –40 to 85°C Operating Temperature Range

2 Applications

• High-Speed Cables and Backplanes in Communication Systems

• PCIe, SAS I/II/III, SATA 3/6 Gbps (with OOB detection) and many others

3 Demo Kit Contents

• DS125BR111EVM Board

4 Ordering Information

Table 1. DS125BR111EVM Ordering Information

DEVICE QUANTITY

DS125BR111RTWR 1000

DS125BR111RTWT 250

SMA Evaluation Kit: DS125BR111EVM

SNLU168A–August 2014–Revised August 2014 DS125BR111EVM User's Guide SMA Evaluation Kit

Evaluation Board

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5 Evaluation Board

Figure 1. DS125BR111EVM Evaluation Board

6 Setup

The DS125BR111EVM – SMA evaluation kit can be used in three different modes:

1. Pin Control (provides access to selected signal integrity settings)

2. SMBus Mode (full access to signal integrity and control settings)

3. EEPROM Mode (full access to signal integrity and control settings)

The EEPROM mode is a convenient method of programming one or more DS125BRxxx devices on

system power-up when a SMBus master (microcontroller or similar) is unavailable in the design. It is

recommended to use a 1 MHz capable EEPROM. The EEPROM must be 8-kbits or smaller.

4DS125BR111EVM User's Guide SMA Evaluation Kit SNLU168A–August 2014–Revised August 2014

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HIGH

SIGNAL

RESISTOR

SIGNAL

LOW

4-LEVEL CONTROL

HIGH RESISTOR FLOAT LOW

PIN HEADER CONNECTION

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Setup

6.1 DS125BR111 Pin Control

Uses the external control pins on the DS125BR111 to configure the signal integrity and control settings of

the device. Due to the limited number of control pins, a limited bandwidth 4-level input scheme has been

implemented across the control pin interface. This allows for improved EQ and VOD control with fewer

physical pins.

The 4 levels are defined as:

1. Low: 1 KΩto GND

2. Resistor: 20 KΩto GND

3. Float: No External Connection

4. High: 1 KΩto VDD

The EVM interfaces to this 4-level IO using the setup below. Only one shunt connection is required to

access any of the 4 levels. This methodology minimizes the risk of improper connections that could

damage the board or board power supply.

Figure 2. 4-Level IO Control on EVM

The DS125BR111EVM is quickly setup for use in pin control configuration. Jumpers listed below should

be installed on the EVM for pin control.

1. J4 – 3.3 V operation: Use the J1 and J3 connectors to supply 3.3 V power to the EVM. The EVM

power connections are designed to accommodate 1287-ST quick connect tabs or directly soldered to

power leads for connection to a lab power supply.

2. J18 – PWDN = LOW: Device is enabled.

3. J19 – ENSMB = LOW: PIN CONTROL configuration mode.

4. J22 – VDD_SEL = LOW: Uses DS125BR111 internal regulator to convert 3.3 V supply to proper

internal supply level of 2.5 V. Note: The 2.5 V level may be observed on the device VDD pins or the J2

connector.

5. VOD_SEL = 1: Recommended output amplitude settings for CH A and CH B in SAS/SATA and PCIe

applications.

SNLU168A–August 2014–Revised August 2014 DS125BR111EVM User's Guide SMA Evaluation Kit

Setup

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6.2 SMBus Mode

The SMBus can also be used to control the DS125BR111 devices. This method has the advantage of

independent control and finer signal conditioning granularity.

Table 2. Typical DS125BR111 Register Writes

6.3 EEPROM Mode

A serial EEPROM may also be used to configure one or more DS125BR111 devices. This configuration

mode is accessed by setting the ENSMB 4-level input to FLOAT. For additional information please see the

device datasheet.

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Expected Results

7 Expected Results

This evaluation board has been designed to evaluate the cable and/or FR4 signal conditioning

performance of the DS125BR111. Adding additional cables or adaptor boards into the signal path will

have some impact on the optimal settings, but keeping the adaptor boards small and using short high-

quality SMA cables will minimize this effect.

7.1 Performance

When used in a PCIe or SAS system, it is generally expected that the DS125BR111 will be receiving a

signal with embedded TX FIR information. The DS125BR111 works to extend the reach possible by

adding active linear equalization to the channel, boosting attenuated signals so that they can be more

easily recovered at the SAS-3 Rx. The outputs are specially designed to be transparent to TX FIR

signaling passing this information critical for optimal link training to the SAS-3 Rx. The typical device

settings used in most SAS-3 environments are EQ = Level 4, VOD_DB = 0 and VOD_SEL = 1 in Pin

mode or EQ = 03'h, VOD = 111'b, and VOD_DB = 000'b in SMBus mode.

SETUP1: PRBS7 Generator (no TX FIR) →10" FR4 →DS125BR111EVM →Scope

DS125BR111 Settings

1. VOD_SEL = 1

2. VOD_DB = 0

3. EQ0 = 1

Additional documentation and device performance is available in the device datasheet.

Figure 3. 12 Gbps Eye Diagram at SCOPE in SETUP1

SNLU168A–August 2014–Revised August 2014 DS125BR111EVM User's Guide SMA Evaluation Kit

Schematic

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8 Schematic

Figure 4. DS125BR111EVM Schematic

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Schematic

Figure 5. DS125BR111EVM Schematic

SNLU168A–August 2014–Revised August 2014 DS125BR111EVM User's Guide SMA Evaluation Kit

Bill of Materials

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9 Bill of Materials

Item Quantity Reference Digikey PN Manufacture PN Descriptions

1 1 PCB SV601075 DS125BR111EVM PCB ASSY

C1, C2, C3, C4, C5,

2 10 445-1796-1-ND C0603X5R0J104K CAP CERAMIC .1UF 6.3 V X5R 0201

C6, C7, C8, C9, C11

3 1 C12 1276-1482-1-ND CL05A475MP5NRNC CAP CER 4.7UF 10V 20% X5R 0402

SMA1, SMA2, SMA3,

SMA4, SMA5, SMA6,

4 10 SMA7, SMA8, SMA9, J807-ND 142-0771-821 CONN JACK SMA 50 ΩPC MOUNT

SMA10, SMA11,

SMA12

J4, J5, J6, J7,

J8, J9, J10,

5 14 WM6503-ND 22-28-4033 CONN HEADER 3POS .100 VERT GOLD

J11, J18, J19,

J20, J21, J23, J24

J12, J13, J14,

6 10 J15, J16, J17, WM6502-ND 22-28-4023 CONN HEADER 2POS .100 VERT GOLD

J22, J25, J26, J27

R1, R2, R3, R4,

R5, R6, R13, R14,

R15, R16, R17, R18,

7 27 R21, R22, R23, R24, P1.0KJCT-ND ERJ-2GEJ102X RES 1.0K Ω1/10W 5% 0402 SMD

R26, R27, R28, R30,

R32, R33, R34, R35,

R37, R40, R43

R7,R8,R9,

8 9 R10,R11,R12, P20.0KLCT-ND ERJ-2RKF2002X RES 20.0K Ω1/10W 1% 0402 SMD

R25, R29,R31

9 1 R19 P220JCT-ND ERJ-2GEJ221X RES 220 Ω1/10W 5% 0402 SMD

10 1 R20 P4.7KJCT-ND ERJ-2GEJ472X RES 4.7K Ω1/10W 5% 0402 SMD

11 1 R41, R42 P0.0JCT-ND ERJ-2GE0R00X RES 0.0 Ω1/10W 5% 0402 SMD

12 1 U1 DS125BR111RTW IC REPEATER 2CH 24-QFN (4x4mm)

115-43-308-41-

13 1 U2 ED90197-ND IC SOCKET 8PIN DIP

001000

J30, J31, J32, J33

14 12 J34, J35, J36, J37, 3M9580-ND 969102-0000-DA SHUNT JUMPER .1" BLACK GOLD

J38, J39, J40, J41

15 3 J1, J2, J3 1287-STK-ND 1287-ST Connector TAB 0.250 Solder

16 3 R36, R38, R39 DNP DNP DNP

10 DS125BR111EVM User's Guide SMA Evaluation Kit SNLU168A–August 2014–Revised August 2014

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