Software Description
12
SNLU180C – August 2015 – Revised September 2019
Copyright © 2015–2019, Texas Instruments Incorporated
DS250DF810EVM User’s Guide
2.2.4.3
Rx EQ/DFE
The Rx EQ/DFE tab provides the user with full status and control capability of the DS250DF810 Rx
equalization functions. The figure below illustrates the Rx EQ page functions, which are described below
in more detail.
Figure 11. Rx EQ/DFE Tab
•
Adapt Mode
–
Upon landing on the Rx EQ page, the GUI will display the current status for the retimer adapt mode
for the channel selected in the Channel Select pull-down.
–
The Rx EQ page allows the user to set the DS250DF810 device to any of the four available adapt
modes. To do so, the user should click on the desired adapt mode then click “Apply to Channel” to
configure a specific retimer channel. Alternatively the user may broadcast the new adapt mode
setting by clicking on “Apply to all channels.”
•
CTLE Settings
–
Select the desired channel on Channel Select pull-down.
–
The GUI will display the current CTLE boost value on the EQ Boost field of the CTLE Settings
section.
–
If the user wishes to manually set the EQ value:
•
Adapt Mode 0 may be selected (i.e. no adaption mode).
•
Check the “Enable CTLE Boost Override” option.
•
Click on “Reset CDR” button on the top right of page.
–
Boost 3 Limiting bit
•
When checked, this option configures the last CTLE boost stage to have a limiting output.
–
VGA (Variable Gain Amplifier) gain bit
•
When checked, it enables the Rx VGA block.
–
EQ Hi gain mode bit
•
When checked, the EQ is set to the high-gain mode of operation. This bit is enabled by default.
