On Mon, Nov 26, 2012 at 7:47 AM, Franck Jullien <[email protected]>wrote:
> No, I doesn't fix the problem.
>
> Thanks for your help.
>
> Franck.
>
Hi!
I wrote a test case which generates your sequence: load IR with all ones,
add one bit dr scan ending in DRSHIFT, execute queue, add eight bit dr scan
ending in IDLE, execute queue.
I see no problems with the TMS signal during the scan. It's low from
entering CAPTURE-DR until leaving DRSHIFT for IDLE.
Which adapter are you using and which FTDI chip does it have?
By the way, I realized a problem with the way you're splitting a dr scan
into several pieces. Each time you add a dr scan, openocd may add fields
before and/or after to account for taps that are in bypass. So splitting it
this way won't work if there are multiple taps on the chain.
The method I suggested could also break with multiple taps, since if you
don't scan enough bits in the first go, you can't recover the following
bits that have been consumed by trailing dummy fields.
/Andreas
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