For posterity, here's the SSP-to-CS6400 JTAG+ cable pinout: JSCC Control Board Pin Function Pin Function ------------------------------------------------------------- 1 SV_TCK twisted 1 BAC_TCK 14 SV_TCK_L pair 14 BAC_TCK_L ------------------------------------------------------------- 2 no connection 2 no connection 15 no connection 15 no connection ------------------------------------------------------------- 3 SV_TMS twisted 3 BAC_TMS 16 SV_TMS_L pair 16 BAC_TMS_L ------------------------------------------------------------- 4 SV_RST twisted 4 BAC_RST 17 SV_RST_L pair 17 BAC_RST_L ------------------------------------------------------------- 5 SV_TAS twisted 5 BAC_TAS 18 SV_TAS_L pair 18 BAC_TAS_L ------------------------------------------------------------- 6 SV_TDO twisted 6 BAC_TDI 19 SV_TDO_L pair 19 BAC_TDI_L ------------------------------------------------------------- 7 no connection 7 no connection 20 no connection 20 no connection ------------------------------------------------------------- 8 SV_RCK_DIF twisted 8 BAC_RCK_DIF 21 SV_RCK_DIF_L pair 21 BAC_RCK_DIF_L ------------------------------------------------------------- 9 SV_TDI_DIF twisted 9 BAC_TDO_DIF 22 SV_TDI_DIF_L pair 22 BAC_TDO_DIF_L ------------------------------------------------------------- 10 MPRO 10 MPRO 23 GND 23 GND 11 no connection 11 no connection 24 no connection 24 no connection 12 GND 12 GND 25 DIFF_TRANS 25 DIFF_TRANS 13 no connection 13 no connection ------------------------------------------------------------- Both connectors are DB-25 male. Maximum length should not exceed 3m (approx 18-20'). I made my own cable using three equal-length segments of Cat5 secured every foot or so with electrical tape, and a pair of solder-type DB-25 shells, largely because I'm a complete idiot; why I didn't use the _much_ simpler crimp-type pins is beyond me... but anyway, after much fussing about, my homemade cable worked great. Because you only get 24 individual strands with three 4-pair Cat5 cables, I left pin 13 disconnected. -- Chris