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FastScan and FlexTest Reference Manual, V8.6_4
2-44
Add Cell Constraints Command Dictionary
An error condition occurs if the pin pathname does not resolve to a scan
memory element. Buffers and inverters may reside between the pin and the
memory element.
• chain_name cell_position
A string pair that specifies the name of the scan chain and the position of the
cell in the scan chain. The scan chain must be a currently-defined scan chain
and the position must be an integer where 0 is the scan cell closest to the scan-
out pin. You can determine the position of a cell within a scan chain by using
the Report Scan Cells command.
The MASTER memory element of the specified scan cell is set to the value
that you specify; there is no inversion. However, the tool may invert the output
pin of the scan cell if there is anything between it and the MASTER memory
element if inversion exists between the MASTER and the scan output pin of
the scan cell only.
• C0
A literal that constrains the scan cell to load value 0 only.
• C1
A literal that constrains the scan cell to load value 1 only.
• CX
A literal that specifies to simulate the loaded scan cell value as unknown
(uncontrollable).
• Ox
A literal that specifies to simulate the unloaded scan cell value as unknown
(unobservable).
• Xx
A literal that constrains the scan cell to be both uncontrollable and
unobservable (CX and Ox).