Texas Instruments DS280MB810EVM User manual

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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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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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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
LED
USB
A1
RX0 RX1 RX2 RX3 RX4 RX5 RX6 RX7
TX0 TX1 TX2 TX3 TX4 TX5 TX6 TX7
REFCLK in
SMA
25
MHz
REFCLK out
SMA
MSP430
On
Off
SMBusAddress
and
3.3V Æ2.5V
regulator
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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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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.

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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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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.

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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
Register." The data in this register will appear in the “Data” text box.
•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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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.

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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.