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tap reset sequence

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gomsi
Guest

Tue Dec 19, 2006 8:16 am   



I have a simple doubt about resetting sequence of Tap state machine
One way of resetting TAP FSM is through trst signal. Making trst
1(along with TMS=1 for the time trst transitions from 0 to 1) resets
the state machine and it enter run-test-idle mode.

A other way is by asserting TMS=1 for five TCK.. But am not able to do
it this way.. Any clues where i may be going wrong? What should be the
value on other test signals at this time? Since in my case the TAP
remains in test-logic-reset state

Alvin Andries
Guest

Wed Dec 27, 2006 8:05 am   



"gomsi" <gautamsharma24_at_gmail.com> wrote in message
news:1166512579.052963.4320_at_73g2000cwn.googlegroups.com...
Quote:
I have a simple doubt about resetting sequence of Tap state machine
One way of resetting TAP FSM is through trst signal. Making trst
1(along with TMS=1 for the time trst transitions from 0 to 1) resets
the state machine and it enter run-test-idle mode.

A other way is by asserting TMS=1 for five TCK.. But am not able to do
it this way.. Any clues where i may be going wrong? What should be the
value on other test signals at this time? Since in my case the TAP
remains in test-logic-reset state


Asserting TSRT* = 0 (with TMS = 1) or holding TMS = 1 for 5 TCK cycles
should bring your TAP controller in Test-logic-reset state. Making TMS = 0
will then bring you into run-test-idle state.

Regards,
Alvin.

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