Tx Polarity Control; Overview; Ports And Attributes; Description - Xilinx Virtex-5 RocketIO GTP User Manual

Chapter 6: GTP Transmitter (TX)

TX Polarity Control

Overview

The GTP transceiver includes a TX polarity control function to invert outgoing data from
the PCS before serialization and transmission. The TXPOLARITY port is driven High to
invert the polarity of outgoing data.

Ports and Attributes

Table 6-10
Table 6-10: TX Polarity Control Ports
There are no attributes in this section.

Description

The GTP transceiver can invert the polarity of its TX data before it is transmitted. This
feature can be used to avoid hardware fixes for swapped TXP/TXN differential traces on a
board.
108
defines the TX polarity control ports.
Port Dir
TXPOLARITY0
In TXUSRCLK2
TXPOLARITY1
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Clock
Domain
Specifies if the final transmitter output is inverted
or not.
0: Not inverted. TXP is positive, and TXN is
negative.
1: Inverted: TXP is negative, and TXN is
positive.
Virtex-5 RocketIO GTP Transceiver User Guide
Description
UG196 (v1.3) May 25, 2007
R