Rx Pattern Checker - Xilinx 7 Series User Manual

Chapter 4: Receiver
Table 4-22: RX Polarity Control Ports
RXPOLARITY
Using RX Polarity Control
RXPOLARITY can be tied High if the polarity of RXP and RXN needs to be reversed.

RX Pattern Checker

Functional Description
The GTP transceiver receiver includes a built-in PRBS checker (see
be set to check for one of four industry-standard PRBS patterns. The checker is self-synchronizing
and works on the incoming data before comma alignment or decoding. This function can be used to
test the signal integrity of the channel.
X-Ref Target - Figure 4-24
158
Send Feedback
Port Dir
In
PRBS-7 Pattern Checker
PRBS-15 Pattern Checker
PRBS-23 Pattern Checker
PRBS-31 Pattern Checker
Polarity
SIPO
Inversion
Figure 4-24: RX Pattern Checker Block
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Clock Domain
RXUSRCLK2 The 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.
Error
7 Series FPGAs GTP Transceivers User Guide
Description
Figure 4-24). This checker can
Error
Counter RX_PRBS_ERR_CNT
(16 bits)
RXPRBSERR
RXPRBSSEL
RXDATA
UG482_c4_13_110911
UG482 (v1.9) December 19, 2016