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FastScan and FlexTest Reference Manual, V8.6_4
B-2
Control File FlexTest WDB Translation Support
WDB. The strength of these forces and results waveforms determines whether the
utility treats a bidirectional pin as an input or output. For specific information
about how wdb2flex resolves the state of bidirectional pins refer to page B-8.
Control File
The purpose of the control file is to set up sampling of the waveforms in the forces
WDB. To achieve this, you must specify information about the circuit timing. For
timing purposes, wdb2flex considers a clock to be a signal that changes twice in a
test cycle. The Add Pin Constraints command uses this same definition. On the
other hand, the Add Clocks command of DFTAdvisor, FastScan, and FlexTest
defines a clock as any signal that can change the state of a sequential element.
The utility supports the following commands in the control file.
SET CYcle Time number
The Set Cycle Time command sets the test cycle time. The utility takes a sample
every cycle. Number is the cycle time in nanoseconds, which generally equals the
clock period of the stimulus. If the circuit contains multiple clocks, you would
typically make the cycle time equivalent to the period of the fastest clock.
SETup INput Strobes number
The Setup Input Strobes command sets the default strobe point for all input
waveforms. Typically, number would be 0. However, if the primary inputs change
at different times, you should specify a time at which the inputs are no longer
changing.
SETup OUtput Strobes number
Note
All the timing information you specify with these commands
should be relative, not absolute.