Table 51: RX Equalizer Attributes
Attribute Type Description
CH[0/1]_RX_APT_CTRL_CFG2 16-bit Reserved.
Bit Name Address Description
RXMODSEL [3] Receiver input modulation control.
0’b0: PAM4 modulation.
0’b1: NRZ modulation.
CH[0/1]_RX_APT_CFG27A[15:0] 16-bit Adaptation loop freeze controls. Use the recommended
value from the Wizard.
Bit Description
[15:13] Reserved.
[12] Enable to freeze current automatic gain
control (AGC) adapt value.
[11] Enable to freeze current CTLE High
frequency loop (KH) adapt value.
[10] Enable to freeze current CTLE Low
frequency loop (KL) adapt value.
[9] Enable to freeze current Offset Cancelation
(OS) adapt value.
[8:5] Reserved.
[4] Enable to freeze current FFE Tap HM4 adapt
value.
[3] Enable to freeze current FFE Tap HM3 adapt
value.
[2] Enable to freeze current FFE Tap HM2 adapt
value.
[1] Enable to freeze current FFE Tap HM1 adapt
value.
[0] Adaptation freeze control. This bit must be
enabled to freeze the loops selected in
CH[0/1]_RX_APT_CFG27A, and
CH[0/1]_RX_APT_CFG27B. If this bit is set to
Low, all loops will be auto-adapting.
Chapter 4: Receiver
UG581 (v1.0) January 4, 2019 www.xilinx.com
Virtex UltraScale+ GTM Transceivers 89
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