Answers Database
M1 Map - ERROR - No more route-throughs available
Record #3083
Product Family: Software
Product Line: FPGA Implementation
Product Part: map
Product Version: 1.3.
Problem Title:
M1 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 H-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 an F or 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 - Last Modified: 12/01/98 09:09 |
