Texas Instruments DS125BR800EVM User Manual
DS125BR800EVM User’s Guide
User's Guide
Literature Number: SNLU122
November 2012
User's Guide
SNLU122–November 2012
DS125BR800EVM Evaluation Kit
The DS125BR800EVM – SMA evaluation kit provides a complete high band-width platform to evaluate the
signal integrity and signal conditioning features of the Texas Instruments signal conditioning products –
with Equalization and De-emphasis. SMA edge launch connectors are used as the input and the output
connections for this evaluation board. Commercially available adaptor boards can be purchased to
facilitate connection to cables or backplane interconnects.
Topic ........................................................................................................................... Page
1 Features ............................................................................................................. 3
2 4-Level IO Control ............................................................................................... 5
3 Switch Connection Overview ................................................................................ 6
4 Quick Start Guide ................................................................................................ 7
5 SMBus Slave Mode of the EQ, VOD, and De-Emphasis level: .................................. 10
6 Bill of Materials for DS125BR800EVM: ................................................................. 11
7 Schematic for DS125BR800EVM: ......................................................................... 12
8 EVM Layout ...................................................................................................... 13
2
DS125BR800EVM Evaluation Kit SNLU122–November 2012
Copyright © 2012, Texas Instruments Incorporated
Submit Documentation Feedback
www.ti.com
1 Features
• 8 Channel Repeater up to 12.5 Gbps
• Low 65 mW/channel power consumption, with option to power down unused channels
• Transparent management of link training protocol for PCIe, SAS, and 10G-KR
• Receive Equalization up to 30 dB at 12.5 Gbps
• Settable transmit de-emphasis driver to -12 dB
• Transmit output voltage control: 700 – 1300 mV
• Programmable via pin selection, EEPROM, or SMBus interface
• Single supply operation: VIN = 3.3V±10% or VDD = 2.5V ±5%
• -40°C to +85°C Operation
• 5 kV HBM ESD rating
• High speed signal flow–thru pin-out package: 54-pin QFN (10 mm x 5.5 mm, 0.5 mm pitch)
Applications
FR-4 Backplane Traces and High Speed Cable
Ordering Information
EVM ID DEVICE ID DEVICE PACKAGE
DS125BR800EVM DS125BR800SQE/NOPB QFN-54
Features
SNLU122–November 2012 DS125BR800EVM Evaluation Kit
Submit Documentation Feedback
Figure 1. DS125BREVK REV. 1
DS125BR401/DS125BR800 Top Assembly
3
Copyright © 2012, Texas Instruments Incorporated
Features
www.ti.com
Figure 2. DS125BREVK REV. 1
DS125BR401/DS125BR800 Bottom Assembly
4
DS125BR800EVM Evaluation Kit SNLU122–November 2012
Copyright © 2012, Texas Instruments Incorporated
Submit Documentation Feedback
www.ti.com
2 4-Level IO Control
Many of the control pins on the DS125BR800 have more than two valid levels. Table 1 below shows how
to access each of these levels with the switch banks on the back side of the EVM.
4-Level Input Settings Setting for 3 pin switches (3-2-1)
0 - Tie 1kΩ to GND ON - OFF - OFF
R - Tie 20kΩ to GND OFF - ON - OFF
F - FLOAT (open) OFF - OFF - OFF
1 - Tie 1kΩ to VIH OFF - OFF - ON
The following switches are used to set the input condition for the 4-level inputs:
• SW1, SW2, SW3, SW5, SW6, SW8, SW9
There are 3 switches connected to an input signal pin. Each switch when set to the ON position sets the
pin to one of the 4-level setting. The 6 pin switches are assigned similar to the 3 pin switches. The only
difference is 2 signal pins are connected and thus 6-5-4 is for the one signal pin and 3-2-1 is for another
signal pin.
NOTE: Only 1 switch at the ON position is allowed. Activating more than one switch concurrently
results in an indeterminate voltage level.
4-Level IO Control
Table 1. Switches to set the 4-Level input control pins
SNLU122–November 2012 DS125BR800EVM Evaluation Kit
Submit Documentation Feedback
5
Copyright © 2012, Texas Instruments Incorporated
Loading...