GTA04 ... JTAG

[Andy Green]

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Somebody in the thread at some point said:

| Regarding multiplexing JTAG: that sounds scary, and JTAG actually
| has the same number of lines to multiplex as the UART. (TDI/TDO for
| JTAG, TX and RX for the UART.)

More, you will need to do something about TMS or TCK too otherwise the
inactive device will get put into "random" states by shared TMS.

| For JTAG, I'd like to have the option of adding the MSP430 to the
| JTAG chain, e.g., by changing some 0R/NC components. Then we can
| first start work with the serial bootloader, and when we have a bit
| of time to clean up things, try to make JTAG work for the MPU.

If we just place 0Rs but don't target it as the critical path, it is
fine by me.

- -Andy
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