FastScan and FlexTest Reference Manual, V8.6_4
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Analyze Bus Command Dictionary
The available switch choices are as follows:
-Exclusivity — An optional switch that specifies for the tool to analyze the
bus gate to see if it has mutual exclusivity. Mutual exclusivity means that
only one driver can simultaneously force a strong signal onto the bus.
Exclusivity is the default behavior when you specify a gate_id# value
without a corresponding switch.
-Prevention — An optional switch that specifies for the tool to analyze the
bus gate for its ability to attain a state of non-contention.
-Zstate — An optional switch that specifies for the tool to analyze the bus
gate for its ability to attain a high-impedance (Z) state.
•-Drc_check
A switch that specifies for the tool to run the design rule check process again to
categorize all buses and display the results. This is useful if you are changing
constraints or the abort limit in an attempt to pass bus checks rather than abort.
•-ALl
A switch that specifies for the tool to use the more extensive ATPG process to
place all the fail and abort buses in a noncontentious state. The internal
simulation data for this pattern is available in parallel pattern 0.
•-AUto
A switch that automatically tries to locate the bus that cannot be made
contention free. The analysis checks to see if any single bus cannot be made
contention free. Each bus which cannot be made contention free (given the
current abort limit and other restrictions) is reported to the user. Sometimes,
each bus can be satisfied by itself, but some set of busses cannot all be
satisfied. In this case, -Auto switch proceeds to a second analysis where it
creates a minimized set of buses that can’t be satisfied. The final, reduced set
of busses which cannot all be made contention free is reported.
Examples
The following example analyzes a bus that failed the regular bus contention
checking:
set system mode atpg
analyze bus 493