Command Dictionary Set Net Dominance
FastScan and FlexTest Reference Manual, V8.6_4 2-529
Set Net Dominance
Tools Supported: FastScan and FlexTest
Scope: Setup mode
Usage
SET NEt Dominance Wire | And | Or
Description
Specifies the fault effect of bus contention on tri-state nets.
The Set Net Dominance command specifies the fault effect of bus contention on
tri-state nets. This provides the capability to detect some faults on tri-state driver
enable lines when those drivers connect to a tri-state bus. These faults would be
ATPG untestable unless the tool can use the Z-state for detection.
When using FastScan, the Wire behavior is the same where any different binary
value results in an X-state.
The truth tables for each type of bus contention fault effect are given in Tables
2-6,2-7, and 2-8. This command does not affect Good machine behavior.
Table 2-6. WIRE Bus Contention Truth Table
X01 Z
XXXXX
0X0X0
1XX11
ZX01Z
Table 2-7. AND Bus Contention Truth Table
X01 Z
XX0XX
00000
1X011
ZX01Z