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# 3585

M1 PAR: Is there a way to prevent route-thrus?

Description

Keywords: par, route-thru, route-through,

Urgency: standard

General Description:
Is there a way to prevent route-thrus?

There is no command line option to prevent PAR from generating
route-thrus. However there are a couple of things you can
try, depending on the situation.

解决方案

1

Map the logic explicitly using FMAPs, HMAPs, and location
constraints.

If all combinational logic and I/O are explicitly constrained, there is less potential for generating route-thrus.

If you can pinpoint the logic associated with the route-thru,
you may be able to do this on a more limited subset of the
logic.

2

If you observe *bonded* IOBs being used as route-thrus, this
would be a bug in the software.

For XC3000 or XC5200 designs, there is a PAR patch that
corrects the problem.
AR# 3585
创建日期 08/31/2007
Last Updated 10/21/2008
状态 Archive
Type 综合文章