Xilinx Virtex UltraScale+ FPGAs

Table 46: TX Configurable Driver Ports (cont'd)
Port Dir
Clock
Domain
Description
CH[0/1]_TXEMPPRE[4:0] Input Async Transmitter pre-cursor TX pre-emphasis control. The default is
user specified. All listed values (dB) are typical
[4:0] dB (PAM4) dB (NRZ) Coefficient
Units
5’b00000
0.0 0.0 0
5’b00001
–0.3 –0.2 1
5’b00010
–0.7 –0.5 2
5’b00011
–1.1 –0.7 3
5’b00100
–1.5 –0.9 4
5’b00101
–1.9 –1.2 5
5’b00110
–2.3 –1.5 6
5’b00111
–2.7 –1.7 7
5’b01000
–3.2 –2.0 8
5’b01001
–3.7 –2.3 9
5’b01010
–4.2 –2.6 10
5’b01011
–4.8 –2.9 11
5’b01100
–5.4 –3.2 12
5’b01101
–6.0 –3.5 13
5’b01110
–6.7 –3.9 14
5’b01111
–7.5 –4.2 15
5’b10000
–8.3 –4.6 16
5’b10001
–9.2 –5.0 17
5’b10010
N/A –5.4 18
5’b10011
N/A –5.8 19
5’b10100
N/A –6.2 20
5’b10101
N/A –6.7 21
5’b10110
N/A –7.2 22
5’b10111
N/A –7.7 23
5’b11000
N/A –8.3 24
5’b11001
N/A –8.9 25
5’b11010
N/A –9.2 26
Notes:
1. The peak-to-peak differential voltage is defined when
CH[0/1]_TXEMPPOST = 5’b00000, and
CH[0/1]_TXEMPPRE2 = 4’b0000. Emphasis =
20log10(V
high
/V
low
) = |20log10(V
low
/V
high
)|.
Chapter 3: Transmitter
UG581 (v1.0) January 4, 2019 www.xilinx.com
Virtex UltraScale+ GTM Transceivers 80
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