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# 123

XC4000: Use NODELAY attribute to get (fast) Input FF databook speed w/o delay


To skip the delay block on the input of the IOB flip-flops in the 4000
family of devices, attach a 'NODELAY' property to the flip-flop. The
exact method of doing this will vary depending on the entry tool. See the
appropriate user's guide for more information.

AR# 123
Date Created 08/31/2007
Last Updated 10/01/2008
Status Archive
Type General Article