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. 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.
tdo-command-patch
Description: Binary data
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