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. > This is useful with devices that bend the rules of the JTAG protocol -- > for example Xilinx FPGAs sometimes act as if they have an "infinitely > large" DR register for loading bitstreams. i'm not sure how this is relevant. as long as TMS doesn't change, you can shift in bits into DR forever. check out the state diagram here: http://docs.blackfin.uclinux.org/doku.php?id=bfin:jtag:logic -mike
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