Scan test port capture/shift signals maintaining/transitioning sequence and idle states
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United States of America Patent
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Jun 9, 2015
Grant Date -
Jun 26, 2014
app pub date -
Feb 26, 2014
filing date -
Apr 28, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
Operating a state machine includes enabling operation of the state machine upon receiving a signal indicating a change from operation of a test access port to a scan test port. The process maintains the state machine in an IDLE 1 state while receiving a scan test port capture signal and transitions the state machine to an IDLE 2 state when receiving a scan test port shift signal. The process then transitions the state machine to a SEQUENCE 1 state, then to a SEQUENCE 2 state, and then to a SEQUENCE 3 state when receiving sequential scan test port capture signals. The state machine then transitions to an UNLOCK TAP state and then back to the IDLE 1 state when receiving sequential scan test port shift signals on the test mode select/capture select lead.
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