On Sat, Nov 24, 2012 at 11:11 PM, Franck Jullien
<[email protected]>wrote:
> 2012/11/24 Franck Jullien <[email protected]>:
> > 2012/11/24 Franck Jullien <[email protected]>:
> >> I'm doing some tests with an opencores TAP and debug system using
> >> openOCD and an ftdi based JTAG interface.
> >> I'm using the new ftdi driver but I have a problem.
> >>
> >> When I want to do a DR SCAN of one bit and then stay in DR SCAN, I
> >> have TMS signal rising....
> >> If someone familiar with the ftdi driver could take a look at the
> >> waveform and test code:
> >>
> >> http://pastie.org/5429202
> >> http://picpaste.com/pics/jtag-22Kzxqqn.1353794728.png
> >>
> >> (I also tested the ft2232_libftdi driver with the same result).
> >>
> >> Franck.
> >
> > I forgot to paste the debug logs:
> >
> > ------------------------------
> > tap state is RUN/IDLE
> > DRSCAN type:1
> > start=RUN/IDLE goal=DRSHIFT
> > in field 0/1 1 bits
> > DR scan, 1 bits, end in DRSHIFT
> > ------------------------------
> > tap state is DRSHIFT
> > DRSCAN type:1
> > in field 0/1 1 bits
> > DR scan, 1 bits, end in DRSHIFT
> >
> >
> > Franck.
>
> And I also forgot to say that after this 1 bit scan, on the next 32
> bits DR SCAN, there is not TCK generated, JTAG signals are not moving
> anymore....
>
>
Hi!
I'll see if if I can find some time to look into this. It would be good if
you could extend your code snippet above to generate the complete sequence
that shows the issue, i.e. including the following scan that doesn't work.
Looking only at your example it seems to work as expected (apart from the
peculiarity that tms is toggling but that in itself is not a problem since
there are no clocks).
What are you trying to do? Repeatedly clocking data out of DR without going
through DRCAPTURE? Is it supposed to work like that?
/Andreas
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