Answers Database XPLA PC-ISP Programmer: Debug tips on custom built download cables Record #7570 Product Family: Software Product Line: CoolRunner Product Part: XPLA ISP Problem Title: XPLA PC-ISP Programmer: Debug tips on custom built download cables Problem Description: Urgency: Hot General Description: I have a custom built download cable that does not seem to work, how do I debug this? Solution 1:     1.Verify that if the cable is passive, that 100 Ohm series termination     resistors are in place at the DB25 end of the cable.     2.Verify that the parallel port driver is mapped correctly by reading     item number 7 at (Xilinx Solution 7569).     3.Verify that all signals are interleaved with a ground signal.     4.Check correct pin out. Refer to the JTAG header pinout item     number 8 at (Xilinx Solution 7569) and the DB25 pinout item     number 13 at (Xilinx Solution 7569). End of Record #7570 - Last Modified: 10/11/99 16:49

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