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Command Dictionary Add Pin Constraints
FastScan and FlexTest Reference Manual, V8.6_4
2-95
Group 3 Return-one waveform; the pin value may fall to a 0 and then
return to a 1. Includes the R1, SR1, and CR1 constraint formats.
Group 3 waveforms require you to specify the period, offset, and
pulse width.
The “Arguments” subsection that follows describes the constraint formats in more
detail.
Arguments
• primary_input_pin
A required repeatable string that specifies the primary input pins that you want
to constrain.
• constraint_format
An argument that specifies the constant value with which you want to
constrain the primary input pins. The constraint format choices are as follows:
NR period offset (FlexTest Only) — A literal and two integer triplet that
specifies application of the non-return waveform value to the chosen
primary input pins. The test pattern set you provide determines the actual
value FlexTest assigns to the pins.
C0 — A literal that specifies application of the constant 0 to the chosen
primary input pins. For FlexTest, if the value of the pins change during the
scan operation, FlexTest uses the non-return waveform.
C1 — A literal that specifies application of the constant 1 to the chosen
primary input pins. For FlexTest, if the value of the pins change during the
scan operation, FlexTest uses the non-return waveform.
CZ — A literal that specifies application of the constant Z (high-
impedance) to the chosen primary input pins. For FlexTest, if the value of
the pins change during the scan operation, FlexTest uses the non-return
waveform.
CX — A literal that specifies application of the constant X (unknown) to
the chosen primary input pins.
FastScan Specifics:
FastScan does not use the specified primary_input_pin for control.