Set Contention Check

Command Dictionary

 

 

damage can occur. This switch allows the tool to identify these conditions and notify you of their existence.

The tool identifies buses which have circuitry that prevent bus contention and does not check for bus contention problems. This eliminates false bus contention reporting when multiple inputs to a bus are at X. Bus contention that occurs on weak buses do not result in an E4 rules checking violation or pattern rejection during simulation. The tool continues to simulate them as an

X state.

-Port

An optional switch that specifies for the tool to perform contention checking for multiple-port flip-flops and latches. The tool identifies and rejects patterns during which any multiple-port latch or flip-flop has more than one clock, set, or reset input active (or at X).

-BIDI_Retain(FastScan Only)

An optional switch that specifies for the tool to reject patterns during contention checking that cause the direction of IO pins to change following the capture clock.

-BIDI_Mask(FastScan Only)

An optional switch that causes the fault simulator to modify the input values of bidi pins to avoid bus contention after the capture clock of a device pin changes from input mode to output mode as the clock is applied.

-ALl

An optional switch that specifies for the tool to perform contention checking for both tri-state driver buses and multiple-port flip-flops and latches.

-ATpg

An optional switch that specifies for the tool to force all buses to a non- contention state, which ensures that the test generator will not create patterns causing bus contention.

For FastScan — After completing normal test pattern generation for a fault, the tool forces all buses to a non-contention state. If the tool cannot satisfy this condition, given the conditions set by the original pattern, the tool aborts the fault, excludes the pattern from the final test set, and displays a message

2-458

FastScan and FlexTest Reference Manual, V8.6_4

Page 486
Image 486
Mentor v8.6_4 manual ∙ -BIDIRetainFastScan Only, ∙ -BIDIMaskFastScan Only