TX Driver Pre-Cursor Control

Versal ACAP GTM Transceivers Architecture Manual (AM017)
Document ID
AM017
Release Date
2022-04-27
Revision
1.0 English
Driver swing can be controlled through CH*_TXPRECURSOR[5:0]. The default is user specified. All values listed below are in dB and are typical values.
Table 1. Transmitter Pre-Cursor TX Pre-Emphasis Control
[5:0] Emphasis (dB) |Coefficient Units|
6'b0000000 0 0
6'b0000001 –0.204 1
6'b0000010 –0.414 2
6'b0000011 –0.628 3
6'b0000100 –0.848 4
6'b0000101 –1.07 5
6'b0000110 –1.31 6
6'b0000111 –1.54 7
6'b0001000 –1.78 8
6'b0001001 –2.04 9
6'b0001010 –2.30 10
6'b0001011 –2.57 11
6'b0001100 –2.84 12
6'b0001101 –3.13 13
6'b0001110 –3.42 14
6'b0001111 –3.72 15
6'b0010000 –4.04 16
6'b0010001 –4.37 17
6'b0010010 –4.71 18
6'b0010011 –5.07 19
6'b0010100 –5.43 20
6'b0010101 –5.82 21
6'b0010110 –6.22 22
6'b0010111 –6.64 23
6'b0011000 –7.09 24
6'b0011001 –7.56 25
6'b0011010 –8.06 26
6'b0011011 –8.59 27
6'b0011100 –9.15 28
6'b0011101 –9.75 29
6'b0011110 –10.39 30
6'b0011111 –11.09 31
6'b0100000 –11.84 32
6'b0100001 –12.67 33
6'b0100010 –13.58 34
6'b0100011 –14.61 35
6'b0100100 –15.77 36
6'b0100101 –17.11 37
6'b0100110 –18.69 38
  1. The above values are defined when CH*_TXPOSTCURSOR = 6'b00000, CH*_TXPRECURSOR2 = 6'b00000, and CH*_TXPRECURSOR3 = 6'b00000.
  2. Emphasis = 20log10(Vhigh/Vlow) = |20log10(Vlow/Vhigh)|