Software Description
13
SNLU203A – February 2016 – Revised September 2019
Copyright © 2016–2019, Texas Instruments Incorporated
DS250DF410EVM User’s Guide
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EQ Hi gain mode bit
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When checked, the EQ is set to the high-gain mode of operation. This bit is enabled by default.
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EQ boost table - If the user wishes to customize the sixteen value CTLE boost table:
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The user can enter the desired values individually on the “CTLE Boost Settings”.
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After entering all of the CTLE table values, the user should click on “Save as CTLE” button to
save the file.
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This CTLE table file can be loaded for use with new devices by clicking “Load CTLE” and
selecting the file from its location.
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DFE Controls
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Upon landing on the “Rx EQ” tab, the” DFE Controls” section will display the current weight
values and polarities for the five DFE taps for the selected channel.
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The user may check the “DFE Override” box to manually configure the DFE tap values.
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The user may enable continuous DFE adaption by checking the corresponding box on the “DFE
Controls” section.
2.2.4.4
Cross-Point Switch
The cross-point tab allows the user to easily configure the 2x2 cross-point implemented for each of the
adjacent channel pairs of the DS250DF410 retimer.
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With the “Pair Select” pull-down, the user can choose which cross-point pair to configure (0-1, or 2-3.)
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The cross-point mode is selected using the “Crosspoint Configuration” pull-down.
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The cross-point channels mappings are illustrated on the “Crosspoint Settings” table on the page, and
the displayed color matches the current cross-point mode.
There are three cross-point configuration modes selectable via the “Crosspoint Configuration” pull-down:
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Default
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The transmitter for a given channel obtains data from its own receiver.
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Fanout
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Upon selecting the “Fanout” option on the pull-down, the user will be asked to select a channel on
the “Broadcast Channel” pull-down.
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After the user selects the broadcast channel and clicks on “Broadcast”, the received data for the
selected channel will be output both on its Tx output and also on the Tx output of its cross-point
pair channel.
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Lane Crossing
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Upon selecting the “Lane Crossing” option, the GUI will automatically configure the cross-point pair
in question such that the Tx output of a given channel obtains its data from the Rx of its adjacent
cross-point pair channel