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# 3083

4.1i XC4000e MAP - "ERROR - No more route-throughs available"

Description

Keywords: MAP, XC4000e, no, more, route-throughs

Urgency: Standard

General Description:
The following error message is issued:

"ERROR - No more route-throughs available."

Solution

This misleading error message from 4000e MAP is an indication that a BUFGP has non-clock loads that it cannot reach without inserting a route-through.

This problem occurs when the non-clock load is mapped to an H-LUT, and the BUFGP is located on one of the left side sites (that can only reach F and G LUTs directly). The router is forced to use an F or G route-through to get to a C pin, then to the H-LUT. Therefore, the reference to no route-throughs being available is incorrect.

The skew introduced by this problem can be avoided by FMAPing the non-clock loads so that they are not mapped to an H-LUT.
AR# 3083
Date Created 11/13/1997
Last Updated 08/20/2003
Status Archive
Type General Article