Answers Database
2.1i Virtex Timing - There are two known issues where back annotated Virtex timing under reports delay.
Record #6964
Product Family: Software
Product Line: FPGA Implementation
Product Part: ngdanno
Product Version: 2.1i
Problem Title:
2.1i Virtex Timing - There are two known issues where back annotated Virtex timing under
reports delay.
Problem Description:
There is a loss of delay on the slice YBMUX of 364 - 469 ps.
There is a loss of delay on the SR path of all IOB flops of 577 - 743 ps.
This occurs during physical annotation (no ngm mode).
Solution 1:
This issue is fixed in the latest 2.1i Service Pack available at:
http://support.xilinx.com/support/techsup/sw_updates
End of Record #6964 - Last Modified: 11/15/99 14:32 | 
