So when the opportunity arose to join an experimental shuttle using global foundries 180nm for FREE I jumped onto the opportunity and designed my own JTAG!
Because the official JTAG spec lives behind the impregnable IEEE paywall, a castle in which I am not permitted to set foot as a result of not having paid its lord my dues, the verification of the JTAG TAP was actually quite interesting.
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In case anyone wants a preview of what to expect.