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AR# 43772

Virtex-5/Virtex-6 GTX: DFEEYEDACMON encoding and range

Description

DFEEYEDACMON[4:0] provides the average verticalheight used by the DFE.

This translates to the internal vertical eye opening in mV that the DFE block sees.

I wish to know how this translation is done in order to understand how big the eye is internally.

Solution

The DFEEYEDACMON value is nominally 180 mVppd.

It is encoded as min: 5'b00000 = 0 mVppd and max: 5'b11111 = 180 mVppd.
 
However these are the caveats:
 
1. It is an "average" eye and not meant to be an absolute.
 
2. The 180 mVppd varies over PVT.
 
This is an internal debug tool and not a customer ready feature.
AR# 43772
Date Created 08/23/2011
Last Updated 03/16/2015
Status Active
Type General Article
Devices
  • Virtex-5 FXT
  • Virtex-5 TXT
  • Virtex-6 CXT
  • More
  • Virtex-6 HXT
  • Virtex-6 LXT
  • Virtex-6 SXT
  • Less