UPGRADE YOUR BROWSER

We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!

AR# 25110

Virtex-5 LXT/SXT RocketIO - Comma Alignment block behavior in ES vs. Production silicon

Description

This Answer Record describes a change in the behavior of the comma alignment circuit in the GTP transceiver from ES to Production silicon. The Production behavior is represented in the GTP_DUAL SmartModel starting in 9.2.01i.

Solution

In ES Silicon and in 9.1.03 and earlier SmartModels

The first comma received will cause realignment in the receiver and RXCOMMADET will toggle High. However, the first comma might not be present on the RXDATA port. All subsequent commas will show up correctly on the RXDATA port.

In Production Silicon and in 9.2.01 and later SmartModels

The first comma received will cause realignment in the receiver and RXCOMMADET will toggle High. The first comma detected will be present on the RXDATA port. All subsequent commas will also show up correctly on the RXDATA port.

AR# 25110
Date Created 09/04/2007
Last Updated 12/15/2012
Status Active
Type General Article