AR# 1426

Orcad - Orcad VST: All outputs are undefined

描述

Keywords: VST, Orcad, undefined, simulation

Urgency: Standard

General Description:
A file such as "<design>.vst" loads without errors, but all outputs remain undefined.
Trace and stimulus are defined correctly. Even if the global reset has been asserted,
the flip-flop outputs are still undefined.

解决方案

The simulator option Prefix 'G' needs to be used.

With VST 386+ versions 1.1 and older, the line:

PREFIX = 'G'

should be added to the VST configuration file (vst.cfg).

This can be done in three ways:
1. Running XDraft with version 1.1 should automatically add this line.
2. Edit the vst.cfg file and add the line: PREFIX = 'G'
3. From Orcad ESP, select Digital Simulation Tools -> Execute -> Simulate ->
Configure Digital Simulation

Scroll down to the section that says "Prefix Options" and type ""G in one of
the Prefix Definitions boxes.

The format of VST 386+ version 1.2 was changed so that all prefixes could
be used except those that were specifically ignored.

Edit the vst.cfg file and look for the line:
IPREFIX = 'G'

If you find this line, delete the G and save the file;

or

From Orcad ESP:
Digital Simulation Tools -> Execute -> Simulate -> Configure Digital Simulation

Scroll down to the last section that says "Prefixes IGNORED by VST"

If G is one of the Prefix Definitions, delete it.
AR# 1426
日期 10/01/2008
状态 Archive
Type 综合文章