Mentor v8.6_4 manual ∙ on, ∙ Tg FlexTest Only

Set Driver Restriction Command Dictionary

∙ON

A literal that specifies for the tool to restrict buses to only having one driver on at a time and gates to only having one active port; the tool flags multiple active drivers or ports as contention problems.

∙Tg (FlexTest Only)

A literal that restricts FlexTest to generating only test patterns that do not allow multiple drivers. However, FlexTest does allow multiple drivers to be driving the same values during the fault simulation process. This option improves the test generation performance, but can cause FlexTest to incorrectly classify a detectable fault as an ATPG untestable fault.

Examples

The following example creates a strict contention checking environment. The first command specifies for the tool to check for contention on both multiple port gates and buses. If there is a contention problem where signals are driving different values, the tool reports an error and stops the simulation. The second command further restricts the contention checking environment by not allowing multiple drivers to even drive the same values.

set contention check on -error -all set driver restriction on

Related Commands

Set Contention Check

2-476 FastScan and FlexTest Reference Manual, V8.6_4