Answers Database Xchecker Cable: Can the Xchecker cable be used to program via JTAG Programming? Where is TDO? Record #1095 Product Family: Hardware Product Line: Other Product Part: XChecker Cable Problem Title: Xchecker Cable: Can the Xchecker cable be used to program via JTAG Programming? Where is TDO? Problem Description: General Description: Can the Xchecker serial cable by used to program an XC9500 CPLD, instead of using the EZTAG cable? Can the xchecker read TDO values if it is powered by a 3.3V supply? Solution 1: There are two ways of using the xcheker cable in a 3.3V environment. 1. Use the xchecker 3.3V adapter, or 2. Use a 5V supply to power the xchecker and a 3.3V system supply and connect the GROUNDS. Solution 2: The Xchecker cable may be used to program an XC9500 CPLD. The connections needed to program a 9500 device are the following JTAG pins: TDI, TMS, TCK, and TDO. The Xchecker cable has 3 of these 4 pins -- TDI, TMS, and TCK. There is no connector labeled TDO on the Xchecker cable. Use the RD connector instead. As the Xchecker cable is a serial cable, the programming will be slower than that of the EZTAG cable, which is a parallel cable. Solution 3:   0 Vcc to board Vcc   0 Gnd to board Ground   0 TDI to TDI   0 TMS to TMS   0 RD to TDO   0 TCK to TCK End of Record #1095 - Last Modified: 06/08/99 08:00

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