We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!

AR# 15770

5.1i Speed Files - Virtex-II Pro speed files have changed to v1.67


Keywords: Virtex-II Pro, speed file, changed

Urgency: Hot

General Description:
This Answer Record discusses changes in the speed file version (to v1.67) for Virtex-II Pro devices.


Major changes contained in Version 1.67 of the speed files include:

- Simulated values for the -7 speed grade are given
- OBUF and IBUF base numbers are scaled down
- Tckdx is slowed down
- Tdxck has sped up

This fix is included in the latest 5.1i Service Pack, available at:
The first service pack containing the fix is 5.1i Service Pack 2.
AR# 15770
Date Created 10/07/2002
Last Updated 03/06/2005
Status Archive
Type General Article