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AR# 20960

LogiCORE PCI Express - What happens to unused MGTs when a x4 design is plugged into an x1 slot

Description

General Description: 

When using the x4 Xilinx PCI Express Core, what happens to the three unused MGTs when a x4 card is plugged into an x1 slot?

Solution

The core negotiates the lane width and recognizes that it is communicating only on 1 lane. The core asserts TXINHIBIT to the other three MGTs causing TXN to be high and TXP to be low.  

 

For more information on the behavior of TXINHIBIT, see the RocketIO User Guide. 

http://www.support.xilinx.com/xlnx/xweb/xil_publications_index.jsp?category=User+Guides

AR# 20960
Date Created 09/04/2007
Last Updated 05/20/2014
Status Archive
Type General Article