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Command Dictionary Set Driver Restriction
FastScan and FlexTest Reference Manual, V8.6_4
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Set Driver Restriction
Tools Supported: FastScan and FlexTest
Scope: Setup mode
Prerequisites: You can only use this command before the tool begins generating
test patterns. Also, the Set Contention Checking command must be issued to
turn contention checking on.
Usage
For FastScan
SET DRiver Restriction OFf | ON
For FlexTest
SET DRiver Restriction OFf | ON | Tg
Description
Specifies whether the tool allows multiple drivers on buses and multiple active
ports on gates.
The Set Driver Restriction command allows you to specify for the tool to report a
contention problem whenever there are multiple nets driving values onto a bus, or
when multiple ports are active on an individual gate. The default upon tool
invocation is to allow multiple driving nets on a bus or multiple active ports on a
gate only as long as the signals are driving the same value. If multiple signals are
on and are not driving the same values, then the tool flags it as contention.
However some design processes only allow a single driver to be on at a time
regardless of whether the signals are driving the same values. The Set Driver
Restriction command allows you to place this same restriction on the tool.
Arguments
• OFf
A literal that specifies for the tool to allow multiple drivers to be on for a bus
and multiple ports to be active for a gate as long as the driving signals are of
the same value, and therefore there is no contention. This is the default
behavior when you invoke the tool.