Answers Database
UNISIMS/SIMPRIMS: BUFE, BUFT behaves differently for fron-end and back-end simulation for Virtex
Record #1585
Product Family: Software
Product Line: XACT FPGA
Product Part: ppr
Problem Title:
UNISIMS/SIMPRIMS: BUFE, BUFT behaves differently for fron-end and back-end simulation for
Virtex
Problem Description:
Urgency: Standard
General Description:
Why is there a discrepancy between UNISIM and SIMPRIMS simulation
of BUFE and BUFT?
Solution 1:
When using the UNISIM simulation models of BUFE or BUFT with the tri-state enable 'active',
the output is a 'Z'.
However, when using SIMPRIMs for back-end simulation, a pull-up is added by the system tools.
So, with the tri-state enable 'active', the output is a '1'. This is the correct behavoir.
End of Record #1585 - Last Modified: 06/18/99 14:45 |
