On Thursday 26 July 2012 18:54:31 Elden Tyrell wrote: > On Jul 26, 2012, at 12:24 PM, Mike Frysinger wrote: > > On Wednesday 06 June 2012 22:09:01 eldentyrell wrote: > >> The "pod" command lets the user directly modify the TCK, TMS, and TDI > >> pins. However, it does not appear that there is a complementary command > >> to directly read the TDO pin without doing any shifting. > >> > >> Below is a patch against SVN 2026 that adds this command. > > > > i'd just integrate it into the existing pod command rather than add a > > dedicated one. > > Sounds good to me. Do you need me to resubmit the patch to make it part of > the "pod" command or will you do that?
if you could post the patch, that'd be good > Apparently the only way to access TDO from the command line in urjtag is to > tell it the size of the DR and then tell it to shift the DR. However, > when loading a bitsream, there really isn't a "DR shift register length" > -- no matter how many bits you push in one end you'll never see those same > bits come out the other end. So no finite number would be a correct > answer. It's a "bottomless shift register" in that sense. yes, that's true, but if you don't know the length, how do you know when to stop shifting ? if you know the length before you start shifting, then you can set it and tell urjtag to do it for you. -mike
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