Electronics > FPGA
Home made Xilinx parallel cable III not working
garvind25:
Hi there,
My name is Arvind Gupta. I am new to this forum. I was trying to make a Xilinx parallel cable III at home. It is not working. I hope someone can help debug the issue.
The document for Xilinx parallel cable III can be found here:
https://www.xilinx.com/support/documentation/user_guides/xtp029.pdf
As per page 3, I made a PCB and assembled the ckt. While I was trying to program a FPGA kit with it (which has its own parallel port programmer) using iMPACT , a question came up : "There are many unknown devices being detected. Press Yes to continue or No to to stop". On selecting Yes, the software proceeded with its functioning and then hung up. There was no progress in iMPACT and I had to force-close the interface. I am attaching snapshots of the problem.
Pic0: Option chosen when iMPACT opened up
Pic1: Description of the question which comes on choosing JTAG interface
Pic2: iMPACT hanging up
I am using XC3S400 FPGA kit and ISE 8.1i with it (Win XP SP2 based PC). I checked the kit by programming it with its own cable. It was working OK.
So what could be the problem? Do I need to make any configuration changes in iMPACT/ ISE before I can use the XPT029 parallel port cable? I have checked the pcb layout and connections. They are OK.
Awaiting your response.
Thanking You,
Arvind Gupta
alm:
Does the computer you are using have a true parallel port, i.e. one connected through ISA, PCI or PCI-express? Hacks like this often do not work correctly with USB-parallel printer interfaces, which are usually made just for printers.
garvind25:
Thanks for your response. The kit has it own parallel port programmer. That is working. So I assume it has a true parallel port (the 25 pin pink coloured female connector is located just below the mouse PS2 connector ie. the connector is fixed on the motherboard).
Regards,
Arvind Gupta
alm:
Does changing the parallel port settings in the BIOS between EPP, ECP, etc make any difference?
garvind25:
No it doesn't ! I have a HP-Compaq desktop. In its BIOS --> Advanced --> Printer Mode settings; there are 3 options: EPP+ECP, Output only, Bi-directional. The default set was EPP+ECP mode. I changed to the other two but no luck. In Advanced settings only, there was On board devices --> parallel port option in which I could change the settings of IRQ, DMA and address range. I tried all the 12 possible combinations but again no luck.
Regards,
Arvind Gupta
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