AR# 1065: XC3000/XC4000/XC5200: How to select cmos input thresholds for FPGAs
AR# 1065
XC3000/XC4000/XC5200: How to select cmos input thresholds for FPGAs
Description
Keywords: THRESHOLD, TTL, CMOS, INPUTS, FPGAs
The input thresholds for FPGAs can be set to either CMOS or TTL (TTL is the default)
The setting is a globally selectable input threshold (all CMOS or all TTL), selectable when you run makebits. If you type "makebits -h", you will see two ways of doing this :
-c
or
-f Input: CMOS
解决方案
FROM DOS:
For 2000 and 3000 use: makebits -c
For 4000 and 5200 use: makebits -f inputs:cmos
IN WINDOWS DESIGN MANGER 6.0 select Design -> implement -> configuration, edit template then click on cmos under inputs threshold: