Attention Beagle Guys,
Can we get confirmation about how the JRC works in OMAP?
Is the following assertion true?
When a TAP is enabled, it is always enabled at a FIXED position within
the chain?
To describe it another way - Assume there are 3 taps.
(1) ICE Pick - the JRC
(2) An ARM CPU Tap
(3) A DSP CPU Tap
The ARM CPU - if it is enabled is ALWAYS after the JRC and ALWAYS before
the DSP (if it is enabled).
The JRC can *NEVER* swap the order of any two taps.
It sure seems like this is true.
Today - OpenOCD - and most other JTAG programs assume the following:
1) The tap is IN BYPASS (and has length 1)
or
2) The tap is *NOT* in BYPASS (and has length N)
It seems, all we must do is introduce a 3rd state.
3) The tap is Disabled and has Length 0.
-Duane.
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