Ports and Attributes
The following table denes the aributes required for TX pre-coder control.
Table 42: Pre-Coder Attributes
Attribute Type Description
CH[0/1]_TX_PCS_CFG0 16-bit Reserved.
Bit Name Address Description
TX_PRECODE_ENDIAN [11] In PAM4 mode, this attribute controls pre-coder
transmitted endianness. In NRZ mode, the default
Wizard value must be used.
1’b0: Non-inverting.
1’b1: Inverting.
TX_PRECODE_BYP_EN
[10] In PAM4 mode, this attribute enables pre-coding. In
NRZ mode, the default Wizard value must be used.
1’b0: Enables pre-code.
1’b1: Disables pre-code.
IMPORTANT! In PAM4 mode, if pre-coder is enabled for the transmier, the receiver pre-coder should
also be enabled for proper data recovery.
TX Fabric Clock Output Control
The TX Clock Divider Control block has two main components: serial clock divider control, and
parallel clock divider and selector control. The clock divider and selector details are illustrated in
the following gure.
Chapter 3: Transmitter
UG581 (v1.0) January 4, 2019 www.xilinx.com
Virtex UltraScale+ GTM Transceivers 73
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