TX Driver Pre-Cursor 2 Control - AM017

Versal Adaptive SoC GTM Transceivers Architecture Manual (AM017)
Document ID
AM017
Release Date
2024-09-05
Revision
1.1 English

Driver swing can be controlled through CH*_TXPRECURSOR2[5:0]. The default is user specified. All values listed below are in dB and are typical values.

Table 1. Transmitter Pre-Cursor 2 TX Pre-Emphasis Control
[5:0] Emphasis (dB) |Coefficient Units|
6'b0000000 0.00 0
6'b0000001 –0.24 1
6'b0000010 –0.44 2
6'b0000011 –0.67 3
6'b0000100 –0.89 4
6'b0000101 –1.11 5
6'b0000110 –1.35 6
6'b0000111 –1.58 7
6'b0001000 –1.81 8
6'b0001001 –2.06 9
6'b0001010 –2.30 10
6'b0001011 –2.57 11
6'b0001100 –2.80 12
6'b0001101 –3.08 13
6'b0001110 –3.32 14
6'b0001111 –3.59 15
6'b0010000 –3.86 16
6'b0010001 –4.16 17
6'b0010010 –4.47 18
6'b0010011 –4.80 19
6'b0010100 –5.14 20
6'b0010101 –5.56 21
6'b0010110 –5.99 22
6'b0010111 –6.35 23
6'b0011000 –6.78 24
  1. The above values are defined when CH*_TXPOSTCURSOR = 6'b00000, CH*_TXPRECURSOR = 6'b00000, and CH*_TXPRECURSOR3 = 6'b00000.
  2. Emphasis = 20log10(Vhigh/Vlow) = |20log10(Vlow/Vhigh)|
  3. Pre-Cursor 2 can be used as de-emphasis by setting fir_pr2_inv = 1 in attribute control CH*_TX_CTRL_CFG0.