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FastScan and FlexTest Reference Manual, V8.6_4
2-40
Add Capture Handling Command Dictionary
Add Capture Handling
Tools Supported: FastScan
Scope: All modes
Prerequisites: You can use this command only after FastScan flattens the design to
the simulation model, which happens when you first attempt to exit Setup
mode or when you issue the Flatten Model command.
Usage
ADD CApture Handling {Old | New | X} {gate_id# | pin_pathname |
instance_name | {-Cell cell_name}}... [-
SInk | -SOurce]
Description
Specifies the data capturing behavior for the given state element.
After changing the data capture handling for selected state elements with Add
Capture Handling, you need to issue the Set Capture Handling command to allow
FastScan to automatically identify the upstream state elements with their
associated sinks, and the downstream state elements with the associated sources
you defined.
When you use the Add Capture Handling command to change the data capture
handling settings, you cannot define source points with the new handling behavior
if they propagate to sink points that do not have the new behavior, or to non-clock
primary outputs. If FastScan has different capture handling behaviors for the same
state element, the behavior you define with the Add Capture Handling command
overrides the behavior you globally defined with the Set Capture Handling
command.
FastScan limits the scope of the effect of the capture handling behavior to the
circuitry between the source and the sink points. You cannot simulate a newly
captured effect past the sink point.
You can change the simulation behavior of RAM models with data hold capability
using the Add Capture Handling command. This is useful in cases when it is
required to model a RAM which has data hold capability but does not introduce
any latency.