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Good RA connector for external JTAG?

Discussion in 'Electronic Design' started by Ben Jackson, Apr 8, 2007.

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  1. Ben Jackson

    Ben Jackson Guest

    I need JTAG access on a board that's going to be mounted in a chassis.
    My original thought was just to use a RA .100 pin header, but maybe
    there's something like mini-DIN would be better. I'd have to make a
    special cable, but it would be keyed and take up less board area.
    Anyone have a connector they favor for JTAG use? Is there a standard
    I haven't heard of?
  2. Nico Coesel

    Nico Coesel Guest

    We had -more or less- the same problem when designing boards so they
    can be programmed in a gang programmer (also self made). I think the
    designer choose a smaller pitch 10 pin RA header and omit most of the
    JTAG grounding pins.
  3. 2mm RA. You could easily make a 2mm to .100 adaptor on a small pcb. Buy a
    handfull of IDC cables and your done.

  4. Rich Grise

    Rich Grise Guest

    Well, I don't know what "RA" means, but I've got a Xilinx developer kit
    on loan from a client, and it just uses very ordinary 7-pin .1 SIP header
    and IDC plugs. There's one blank pin if you want to key it.

    Good Luck!
  5. Ben Jackson

    Ben Jackson Guest

    "Right angle".

    I've been looking around and it looks like everyone has invented their
    own JTAG standard. The "new" Xilinx one is now a 2mm (I think) dual row
    to get more grounds in. Altera uses a 2x5 .100" header (times two if
    you use a serial EEPROM config).

    I think to save "edge real estate" I'm just going to use RJ45 for the
    debug headers, since they will not be confused with video, and take up
    much less width/pin.
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