Software Description
11
SNLU180C – August 2015 – Revised September 2019
Copyright © 2015–2019, Texas Instruments Incorporated
DS250DF810EVM User’s Guide
2.2.4.2
Device Status
In order to view a real-time high-level summary of the current device status and control settings, navigate
to the “High Level Page”, and choose the “Device Status” tab. 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 no detectable 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.
•
CDR Locked: For each channel the CDR lock status is displayed. Note that each channel’s CDR status
and configuration is independent from the others.
•
EQ Boost: This field displays the Rx Continuous-Time Linear Equalizer (CTLE) boost value as a four
digit figure. Each digit corresponds to one of the four CTLE stages, and each can have a value from 0
to 3.
•
DFE Taps: The boost values in mV for each of the five Decision Feedback Equalizer (DFE) taps are
displayed here.
•
HEO and VEO: The HEO and VEO values in mV are displayed for each of the retimer channels.
•
Tx FIR filter taps: The Device Status tab displays the current decimal value and polarity for the FIR
pre-cursor, main-cursor and post-cursor taps for each of the channels. The coefficient sum (i.e.
absolute sum of the FIR tap values) is also displayed. Finally, the page displays approximate values
for the effective post-cursor and pre-cursor de-emphasis based on the channel’s current FIR tap
settings.
Figure 10. High-Level Page, with Device Status Tab Selected
