AR# 1956

XACT-CPLD, XC9500: Assertion failed: ia.RetSize()==1 && ia[0]->RetInputInstance(), file outinst.cc

Description

Keywords: 9500, assertion, abnormal program termination

Urgency: Standard

Problem Description:

When implementing a 9500 CPLD design, the following error may
occur:

hitop -f logic.xff -s -l logic.log -o logic

Optimizer/Partitioner Version XACT-CPLD-V6.0.2
(c) Copyright 1989-1995 Xilinx Inc. All rights reserved.
Reading logic.xff
Assertion failed: ia.RetSize()==1 && ia[0]->RetInputInstance(),
file outinst.cc, line 366

abnormal program termination


CAUSE: This error may happen if there is a wrong connection
like OBUF driving internal logic. This can be verified from the
schematics or the .xff file. An example of .xff file would be:

SYM, $I51, OBUF, SCHNM=OBUF, LIBVER=2.0.0
PIN, I, I, $Net00033_
PIN, O, O, SWIRLSELUP
^^^^^^^^^^
END
SYM, $I75, INV, SCHNM=INV, LIBVER=2.0.0
PIN, I, I, SWIRLSELUP
^^^^^^^^^^
PIN, O, O, $Net00051_
END

SYM, $I79, AND, SCHNM=AND2, LIBVER=2.0.0
PIN, I0, I, SWIRLSELUP
^^^^^^^^^^
PIN, I1, I, $Net00050_
PIN, O, O, $Net00056_
END
...

Solution

1

An OBUF can only drive an OPAD, IOPAD, or IBUF.
Remove the incorrect connection to fix the problem.

2

There will be an explicit message in the M1 release of the software. You will get message like:
ERROR:basnu - output pad net 'SWIRLSELUP' has illegal connection
AR# 1956
Date 10/06/2008
Status Archive
Type General Article