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Richard Erlacher
05/02/12 00:21
Modified:
  05/02/12 00:23

Read: 767 times
Denver, Co
USA


 
#187282 - How about "flying lead" JTAG adapters?
Responding to: Michael Karas's previous message
Once upon a time, XILINX sold a flying lead adapter, i.e. one that plugged into a parallel port, and had separate wires for the four active signals that they use, in addition to power and gnd. Several individuals sold copies of these at a small fraction of the price XILINX asked, and I bought one of those, though I did have several different JTAG adapters that accompanied various boards with which they worked. The flying lead adapter works fine, so long as one has a parallel port available. I can't speak for their USB-based adapters, since I use the older FPGA's and CPLD's most of the time. XILINX still supports the parallel-port-based programming cables, and I find them quite useful even today. The XC9572XL is among those with which these adapters work.

I've found that some of the older XC9500-series CPLD's require old software in order to program them, as their internal ID codes differ from what the newer software expects.

The conclusion I've reached, as relates to Mahmood's problem, is that if he can hook up the wires, a flying lead version based on the USB adapter should work as well, though it might involve less effort if he simply routes the wires to the terminals on the target board that expects to "see" them. They are, after all, just wires with single-pin connectors. It's worth noting that XILINX still supports these flying-lead adapters, and it might take an experienced technician as much as 10 minutes to fabricate one, provided he has the parts.

RE


List of 12 messages in thread
TopicAuthorDate
Can J-LINK program CPLD      Mahmood Elnasser      05/01/12 11:51      
   Different JTAG Pods      Michael Karas      05/01/12 16:51      
      How about "flying lead" JTAG adapters?      Richard Erlacher      05/02/12 00:21      
   Not easily      Jez Smith      05/02/12 00:46      
      CPLDs      Mahmood Elnasser      05/02/12 05:06      
         Yes thats the LPT cable      Jez Smith      05/02/12 13:39      
            yes please      Mahmood Elnasser      05/02/12 15:58      
            ByteBlasters      Michael Karas      05/02/12 20:54      
               There may be some hope.      Richard Erlacher      05/02/12 21:20      
                  Zero Hope        Michael Karas      05/03/12 15:38      
                     XILINX USB Download Cable      Mahmood Elnasser      05/15/12 08:36      
   JTAG      Andy Peters      05/02/12 22:03      

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