AR# 6794

1.5is2 Map : FATAL_ERROR:baste:bastetspec.c:1197:1.87.18.4 - Failed to create DP_PATHDELAY_FROMTO for tspec

Description

Keywords : map. baste, constraint, latch, from to

Urgency: Standard

Problem Description : When a FROMTO constraint is placed on a pad driving an IBUF ending
at the G input of a IFFX Latch, the following error is issued by map:

FATAL_ERROR:baste:bastetspec.c:1197:1.87.18.4 - Failed to create
DP_PATHDELAY_FROMTO for tspec TSlat Process will terminate. Please call
Xilinx support.

Solution

A sample timing constraint is :

NET "TEST" TNM_NET = "TNMclk";
TIMESPEC "TSlat" = FROM "TNMclk" TO "LATCHES" 10.000000 ns;

The above constraint caused the error message. A work around is to replace
the above constraint with the one below.

NET TEST2 MAXDELAY=10 ns;

Where TEST2 is the output of the IBUF or BUFG that drives the input of the
latch.

This problem has been fixed fpr version 2.1i.
AR# 6794
Date 04/25/2000
Status Archive
Type General Article