1. Home
  2. Field-Programmable Gate Arrays
  3. Xilinx programmer, many unknown devices...

Xilinx programmer, many unknown devices...

I would like to ask some questions regarding a Xilinx JTAG programmer:

First, it seems that the programmer doesn't actually connect to the LPT port because of gender mismatch. Luckily I have a parallel port gender changer. Is this still ok?

Second point, I connect the programmer and start up xilinx ise and impact. I get a message that many unknown devices are being detected, is this normal?

Last point, the download cable seems to be some sort of 2 x 8 block socket, i.e. 16 pins, how do I identify the required pins i.e. vdd,gnd,tdi,tms,tck,tdo?

Thanks in advance

Reply to
<darrick>
Loading thread data ...

No. Probably your chain from TDI at the programmer through the devices up to TDO at the programmer is broken somewhere.

Carefully check the documents or what els you have.

Bye

--
Uwe Bonnes                bon@elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
Reply to
Uwe Bonnes

There is nothing to check, the programmer is connected and that's all. I did not connect anything else.

Reply to
<darrick>

It seems to fit all my pcs. What computer are you trying to hook it up to? Do you get an error message about the interface?

When there is no device connected or when there is no power on the connected device, noise seems to generate the unknown devices message. The programmer must be connected to your device and the power must be on for that device.

That is in the documentation. I forget where but that is where I got it from.

Reply to
doug

Make sure you don't have the board end connector turned around the wrong way.

---Matthew Hicks

Reply to
Matthew Hicks

First I need to know where in this header are the jtag pins. Any ideas. Then we need to make sure the notch is facing the right way (or whatever)

Reply to
<darrick>

What board do you have? You might have the wrong kind of cable end for the type of jtag connector on your board. Your board probably has a Parallel-(# here) Jtag connector which isn't directly compatible with the single in-line programmer cable end.

---Matthew Hicks

Reply to
Matthew Hicks

Please read the online documantation for your programmer. Typically the programming heads for Xilinx programmers 1) are fully documented, 2) come with "flying lead" headers and "high speed" ribbon cable jumpers, and 2) have the pins labeled on the side of the programmer that the ribbon jumper (or flying lead header) plug into.

If you cannot find documentation online (I'm sure it's there but you must've tried to find it) call the applications guys on Monday.

JTAG should be much simpler that it sounds it is for your situation.

By the way - are you using a PC-XT as your platform? Those have serial and parallel ports that are the inverse of the common PC of today (starting with the PC-AT).

Reply to
John_H

The documentation for the pinout is here:

formatting link

Reply to
davide

Are you sure that it's a parallel adapter? It could be one of the old serial adapters.

Note that old PCs might have used the standard 25-pin serial port connector, which is the opposite sex of the 25-pin Centronics parallel connector.

Anyways -- if the adapter doesn't fit into what you think is the paralel port, it's probably the wrong port or the wrong adapter.

Depends on what's on your JTAG chain. If the only things on the chain are the FPGA and the config PROM but it reports other stuff, then that's a problem.

RTFM!

-a

Reply to
Andy Peters

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.