Answers Database

M1.3/M1.4 Map - ERROR - No more route-throughs available


Record #3083

Product Family:  Software

Product Line:  Merged Core

Problem Title:
M1.3/M1.4 Map - ERROR - No more route-throughs available


Problem Description:
This misleading error message from 4000e map is an indication that a BUFGP
has non-clock loads that it can't reach without inserting a route-through.
The known source of this problem is when the non-clock load is mapped to
a G-LUT and the BUFGP is located to one of the left side sites which can
only reach F and G LUTs directly. The router is forced to use a For G
route-through to get to a C pin, then the HLUT. The reference to no route-
throughs being available is incorrect.


Solution 1:

The skew introduced by this problem can be avoided by FMAPing the
non-clock loads so that they do not get mapped to an HLUT.



End of Record #3083