Xilinx Virtex UltraScale+ FPGAs - RX Pattern Checker

Table 59: RX Polarity Control Ports
Port Dir Clock Domain Description
CH[0/1]_RXPOLARITY
1
In CH[0/1]_RXUSRCLK2 The CH[0/1]_RXPOLARITY port can invert
the polarity of incoming data:
0: Not inverted. RXP is positive, and
RXN is negative.
1: Inverted. RXP is negative, and RXN
is positive.
Notes:
1. CH[0/1]_RXPOLARITY can be tied High if the polarity of RXP and RXN needs to be reversed.
RX Pattern Checker
The GTM receiver includes a built-in PRBS checker (see the following gure). This checker can be
set to check for one of the six industry-standard PRBS paerns. The checker is self-synchronizing
and works on the incoming data before comma alignment or decoding. This funcon can be used
to test the signal integrity of the channel.
Figure 43: RX Pattern Checker Block
Polarity
Control
SIPO
Error
Counter
(32 bits)
PRBS-31 Pattern Checker
PRBS-23 Pattern Checker
PRBS-15 Pattern Checker
PRBS-9 Pattern Checker
RX_PRBS_ERR_CNT
CH[0/1]RXPRBSERR
CH[0/1]RXDATA
CH[0/1]RXPRBSPTN
PRBS-13 Pattern Checker
PRBS-7 Pattern Checker
Error
X20928-053118
Ports and Attributes
The following table denes the paern checker ports.
Table 60:
Pattern Checker Ports
Port Dir Clock Domain Description
CH[0/1]_RXPRBSCSCNTRST In CH[0/1]_RXUSRCLK2 Reset the PRBS error counter.
Chapter 4: Receiver
UG581 (v1.0) January 4, 2019 www.xilinx.com
Virtex UltraScale+ GTM Transceivers 101
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