Texas Instruments DS280MB810EVM User manual

SNLU213A–October 2016–Revised September 2019

DS280MB810EVM User’s Guide

User's Guide

SNLU213A–October 2016–Revised September 2019

DS280MB810EVM User’s Guide

The DS280MB810 is an 8 Channel Linear Repeater with the ability to extend the reach and robustness of

high speed serial links for up to 28 Gbps interfaces. Simplified equalization control, low power

consumption, and ultra-low additive jitter make the DS280MB810 ideal for front-port interfaces such as

100G-SR4/LR4/CR4 and backplane applications. The small 8 mm x 13 mm package easily fits behind

numerous standard front-port connectors, including SFP28, QSFP28, CFP2/CFP4, and CDFP, without the

need for a heat sink. The optimized package dimensions, high-speed signal escape, and the pin-

compatible retimer portfolio make the DS280MB810 well-suited for high-density backplane and front port

applications. The DS280MB810 can be configured via the default SMBus slave mode or with an external

EEPROM. With this kit, users can quickly evaluate the linear equalizer’s performance.

Figure 1. DS280MB810EVM.

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DS280MB810EVM User’s Guide

Contents

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

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

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

4 Setup .......................................................................................................................... 4

5 Example Hardware Test Setup........................................................................................... 14

6 Common Problems and Possible Solutions ............................................................................ 17

7 Bill of Materials ............................................................................................................. 18

8 EVM Cable Assemblies ................................................................................................... 21

List of Figures

1 DS280MB810EVM........................................................................................................... 1

2 DS280MB810EVM Block Diagram. ....................................................................................... 4

3 Repeater Profile Updater Installers........................................................................................ 6

4 DS280MB810EVM Default Configuration................................................................................. 7

5 SigCon Architect Configuration Page. .................................................................................... 8

6 SigCon Architect Low Level Page. ........................................................................................ 8

7 SigCon Architect High Level Page: Device Status. ..................................................................... 9

8 SigCon Architect High Level Page: Block Diagram.................................................................... 10

9 SigCon Architect High Level Page: Crossspoint Switch. ............................................................. 11

10 SigCon Architect High Level Page: Crosspoint Switch................................................................ 11

11 SigCon Architect EEPROM Page. ....................................................................................... 13

12 Example Test Set Up...................................................................................................... 14

13 25.78125 Gbps CAUI-4 Eye Mask with 5in input channel and minimal output channel ......................... 15

14 10.3125 Gbps nPPI Eye Mask with 5in Input Channel and Minimal Output Channel ............................ 15

15 25.78125 Gbps CAUI-4 Eye Mask with 10in Input Channel and Minimal Output Channel ...................... 16

16 10.3125 Gbps nPPI Eye Mask with 10in Input Channel and Minimal Output Channel .......................... 16

List of Tables

1 DS280MB810 Ordering Information....................................................................................... 3

2 Description of SMBus and EEPROM Connections...................................................................... 5

3 Test Point Connections (Output Voltage)................................................................................. 5

4 Settings and Measurements for CAUI-4 and nPPI with 5in Input Channel and Minimal Output Channel ..... 15

5 Settings and Measurements for CAUI-4 and nPPI with 10in Input Channel and Minimal Output Channel ... 16

Trademarks

All trademarks are the property of their respective owners.

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Features

SNLU213A–October 2016–Revised September 2019

DS280MB810EVM User’s Guide

1 Features

• 8-Channel Unidirectional Repeater operating at rates up to 28 Gbps; 4 channels available for EVM

testing

• Linear Equalization that allows for support of link training protocols

• Programmed by external EEPROM or SMBus interfaces

• Single supply operation: 2.5V ± 5% or 3.3 V ± 5%

2 Applications

• Front-Port Eye Opener for Optical (28G-VSR and CAUI-4) and Copper Cables (100G-CR4)

• Backplane Reach Extension (100G-KR4)

• SFP28, QSFP28, CFP2/CFP4, CDFP

3 Ordering Information

Table 1. DS280MB810 Ordering Information

EVM ID DEVICE ID DEVICE PACKAGE

DS280MB810EVM DS280MB810 nfBGA (135)

NOTE: Huber+Suhner MXP cable assembles are not provided with this EVM. Users are expected to

provide cabling to connect to other boards and test equipment. For MXP cabling

recommendations please see Section 8.

EEPROM

Config headers

DS280MB810

(top view)

I2C debug

header

3.3V

(Optional)

GND

2.5V

Test loops for

supplies close

to device

2.5v

Reg

Disable

LED

USB

RX0 RX1 RX2 RX3 RX4 RX5 RX6 RX7

TX0 TX1 TX2 TX3 TX4 TX5 TX6 TX7

REFCLK in

SMA

MHz

REFCLK out

SMA

MSP430

Off

SMBusAddress

and

3.3V Æ2.5V

regulator

Setup

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DS280MB810EVM User’s Guide

4 Setup

This section describes the jumpers and connectors on the EVM as well as how to connect, set up, and

use the DS280MB810EVM.

Figure 2. DS280MB810EVM Block Diagram.

4.1 Modes of Programmable Communication

The DS280MB810EVM can be programmed in one of two modes:

1. SMBus Mode – Provides full access to the DS280MB810 status and control settings via the on-board

USB2ANY. ADDR0 and ADDR1 pins are used to set the SMBus slave address.

2. External EEPROM – Provides access to the DS280MB810’s EEPROM programmable control settings

via an 8 pin EEPROM. Only a subset of SMBus slave register bits is written to EEPROM. The

EEPROM can program up to 16 slave devices.

For convenient use, a USB-to-Mini cable provides a direct connection via J27.

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Setup

SNLU213A–October 2016–Revised September 2019

DS280MB810EVM User’s Guide

4.2 Configuration Overview

The following tables provide a description of the connectors on the DS280MB810EVM.

Table 2. Description of SMBus and EEPROM Connections

Component Name Description

J18.1, J18.2, J18.3, J18.4, J18.5,

J18.6, J18.7, J18.8 RXN3, RXP3, RXN2, RXP2, RXN1, RXP1,

RXN0, RXP0 High-speed differential input pairs

J19.1, J19.2, J19.3, J19.4, J19.5,

J19.6, J19.7, J19.8 TXP0, TXN0, TXP1, TXN1, TXP2, TXN2,

TXP3, TXN3 High-speed differential output pairs

J14.1, J14.3 SDA, SCL SMBus Access (OPTIONAL)

J6 ADDR0 4-level strap pins used to set

J11 ADDR1 the SMBus address

J209 EN_SMB 4-level input to select between SMBus

master (float) or slave mode (high)

J211 READ_EN_N Weak pull up for SMBus Master or Slave

Mode

U2 EEPROM 8-pin DIP Socket for EEPROM

J1 CAL_CLK_IN External 25MHz Calibration Clock Input

J2 CAL_CLK_OUT External 25MHz Calibration Clock Output

J208 PWR 2.5 V for DC Power

J14 PWR 3.3 V for DC Power

J19 GND Ground

J27 USB2ANY USB connection for EVM software control

Table 3. Test Point Connections (Output Voltage)

Component Name Description

TP4 GND Common Ground

TP5 VDD +2.5 V Input

TP6 GND Common Ground

TP7 VDD +3.3 V Input

4.3 Software Setup with SigCon Architect

The general procedure for setting up and testing with the DS280MB810EVM is as follows. For hardware

setup and connections in the steps below, reference the illustrations in Figure 2 and Figure 4 to implement

the appropriate setup.

1. (One-time step) Choose one of the TI SigCon Architect installers to download from the SigCon

Architect Tools Folder on TI.com. Follow the prompts to install software.

•SNLC055: With LabVIEW RTE embedded. Download this folder to install SigCon Architect on a

computer without Internet access.

•SNLC054: Without LabVIEW RTE embedded. Download this folder to install SigCon Architect on a

computer with Internet access.

2. (One-time step)Download the relevant zip folder for the desired profile. For this evaluation module,

select the zip folder for all available repeater profiles.

•SNLC056: Repeater profile updaters.

Setup

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DS280MB810EVM User’s Guide

Figure 3. Repeater Profile Updater Installers.

Choose the Updater.exe profile for the relevant device. In this case, install “DS280MB810

Updater.exe.” Follow the prompts to install.

Once SigCon Architect and the correct updater profiles are installed, close any existing instance of

SigCon Architect again.

3. Connect 2.5 V power via banana plugs to VIN on J208 and GND to GND on J13, or connect 3.3 V

power via banana plugs to VIN on J14 and GND to GND on J13.

• For VDD = 2.5 V: Tie J198 jumper pins 1-2.

• For VDD = 3.3 V: Remove jumper shunt between pins 1 and 2 on J198. Tie J207 jumper pins 10-

9, 8-7, 6-5, 4-3, and 2-1.

4. Install the appropriate jumper shunt to operate with an internal or external calibration clock.

NOTE: The Reference Clock is not required for DS280MB810 operation.

5. Install the appropriate jumper shunts to operate in default configuration with VDD = 2.5 V in SMBus

Slave Mode or EEPROM Master Mode. The default configuration for the DS280MB810EVM operates

in SMBus Slave Mode, as shown below in Figure 4.

• J6 and J11: Tie jumper pins 10-9 in order to set the device slave address = 0x30. For all other

SMBus slave addresses, reference the DS280MB810 data sheet.

• J25: Tie jumper pins 3-1 and 4-2 in order to connect the SMBUS signals.

• J10: Tie jumper pins 3-1 and 4-2.

• J8: Tie jumper pins 2-1 and 4-3.

•(SMBus Only) J209: Tie jumper pins 6-5 to set ENSMB = 1 (1 kΩto VDD).

•(EEPROM Only) J209: Float the jumper shunt to set ENSMB=F.

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Setup

SNLU213A–October 2016–Revised September 2019

DS280MB810EVM User’s Guide

Figure 4. DS280MB810EVM Default Configuration.

NOTE: The jumper on J211 (if present) is connected only to pin 12, which is the pin in the white

box in Figure 4 (the top right pin).

6. Connect a PC to DS280MB810EVM with a USB-to-Mini cable via J27.

7. Open SigCon Architect, and navigate to the “Configuration” page of DS280MB810 via the “Selection”

column. Choose “Slave Address” “0x30” from the drop down menu. Verify the “USB2ANY Details”

specify “USB2ANY 0," and click “Apply." Successful connection is indicated by the green

“CONNECTED” indicator on the bottom of the application, as seen below in Figure 5. Once connection

is successfully established, users can read and write various settings to the device in real-time, as

described in the following steps.

Setup

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DS280MB810EVM User’s Guide

Figure 5. SigCon Architect Configuration Page.

8. In order to read and write to all registers on the DS280MB810, navigate to the “Low Level Page," as

shown below in Figure 6. Only in SMBus Slave Mode can the user read and write to all programmable

registers. Click “Read All” in order to load the data in each register from the device to the “Register

Map."

•Read Register: Type the readable address in the “Current Address” text box. Click “Read

•Write Register: Type the writable address in the “Current Address” text box, and type the data to

write to this address in the “Data” text box. Click “Write Register.”

Figure 6. SigCon Architect Low Level Page.

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Setup

SNLU213A–October 2016–Revised September 2019

DS280MB810EVM User’s Guide

9. In order to view a high level summary of the device status and control settings, navigate to the “High

Level Page," and remain on the “Device Status tab” as shown below in Figure 7. Click “Refresh From

Device” to ensure the settings shown are from the device. The settings on this page are not editable.

•Signal Detect Status: For each channel the device status is displayed as “Signal Not Detected” if

there is not a signal present at the RX side of this channel or “Signal Detected” if there is a signal

present at the RX side of this channel.

•Driver Power: The Driver Power can be turned on or off and the current status is displayed on the

Device Status page. The Driver Power is detected at the TX side of each channel.

•Control Settings: The remaining control settings are programmable through SigCon Architect.

The displayed values are the current settings programmed on the device. Step 10 describes how

to edit these settings.

Figure 7. SigCon Architect High Level Page: Device Status.

Setup

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DS280MB810EVM User’s Guide

10. In order to program high level settings, navigate to the “Block Diagram” tab on the “High Level Page”

as shown below in Figure 8. The EQ Settings and Output Configurations are programmable from this

page. In order to navigate to specific channels use the “Channel Select” drop down menu. Click

“Refresh from Device” to apply the device’s current settings to the control setting boxes. Click “Apply to

Channel” to program the device from the “Block Diagram” page. After programming the device, the

changed settings can be verified on the “Device Status” page, Figure 7. The CAL_CLK Detected

indicator provides a visual representation of whether a calibration clock is active.

•EQ Settings:

– The Equalizer works as a high pass filter compensating for input channel loss.

– The EQ Boost 1, EQ Boost 2, and EQ Boost BW values respectively apply boost to their

respective segments as shown below on the block diagram.

– The EQ DC Gain setting can be either Low or High Gain.

•Driver Output:

– A linear equalizer does not utilize a limiting amplifier. Linear equalizers are necessary for an

application with link training or end to end equalization.

– Driver VOD and EQ DC Gain settings can be changed on this page. The Approximate DC gain

in dB ranges from -4.5 to +5.0 dB.

Figure 8. SigCon Architect High Level Page: Block Diagram.

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