AR# 2654

M1.3 CPLD: Synopsys set_pad_type -slewrate command causes disconnected OBUF in CPLD.


Keywords: synopsys, slewrate, cpld, set_pad_type

Urgency: standard

General Description:

The DC_shell 'set_pad_type -slewrate NONE|HIGH' command
normally used to specify FAST/SLOW outputs for CPLD designs
causes the output pad to become disconnected and trimmed away.
There may be no warning unless all logic back to an input pad
also gets trimmed and produces WARNING nd201 Removing unused
inputs. Otherwise, the trimmed output ports will simply be
missing in the report (.rpt).


Use a UCF file instead of dc_shell script to specify FAST or
SLOW property, as in 'NET Q1 FAST;'.

AR# 2654
Date 03/26/2000
Status Archive
Type General Article