help: debug board interfacing

Werner Almesberger werner at
Sun Jan 4 13:38:18 CET 2009

Sreeraj a wrote:
> specifically, how to use the JTAG pins as I/O pins.

Do you want to interface PC->debugv3->I/O or Neo->debugv3->I/O ?

The Neo can't really control the JTAG signals. But I2C, SPI, etc.
are accessible. (J10 and J11) The schematics of the board are here:

If you're going in the opposite direction (PC->debugv3->I/O), then
only the serial signals and JTAG are available, but not I2C and SPI.

- Werner

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