I am puzzled by the XILINX_PARALLEL_CABLE_III pin definition in file jp1.c


...
#ifdef XILINX_PARALLEL_CABLE_III
...
#define TRST_BIT (0x10) /*Not used*/
...
#define TDO_BIT (0x10) /S6 pin 13*/
...

why TRST and TDO mapped to the same pin, and why TRST_BIT not used?


thanks,

----Botao