Answers Database
2.1i Virtex Map - Map errors out due to invalid trimming of OBUFT control signal
Record #7731
Product Family: Software
Product Line: FPGA Implementation
Product Part: map
Product Version: 2.1i
Problem Title:
2.1i Virtex Map - Map errors out due to invalid trimming of OBUFT control signal
Problem Description:
Urgency: Standard
General Description:
Map incorrectly reports that OBUFT control pin is unconnected:
FATAL_ERROR:xvkpu:xvkpuiob.c:1643:1.23 - Output buffer C535/OBUFT has an
unconnected control pin. Process will terminate. To resolve this error,
please consult the Answers Database at http://support.xilinx.com
The circuit involved looked like this:
LUT4--->LUT1--->OBUFT.T
Solution 1:
The error was prevented by using the following .ucf constraints on the
signal between the LUT4 and LUT4 to prevent the trimming:
NET "PROC_READING_TOP<1>" S ;
This problem is scheduled to be fixed in the first major release (as yet unnamed)
following version 2.1i. This release is currently scheduled for March, 2000.
End of Record #7731 - Last Modified: 10/06/99 09:02 |
