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Don Koch

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Posts posted by Don Koch

  1. I have a board with an SST26VF080A-104I/SN flash connected to a Spartan-6 part (standard serial master configuration) and the ability to connect via JTAG using a JTAG-HS3 cable.  I would normally do this using iMPACT, but this flash part is too new to work with that tool.

    Under iMPACT, connection to the flash through the FPGA is accomplished by first downloading a MicroBlaze load and then programming the flash (mostly hidden from the user).

    If it is not possible to program this flash from JTAG through the FPGA, I also have access to the flash's SPI pins via another connector.  Is there a Digilent solution that would allow me program the part directly, instead of through JTAG?

  2. Starglow --

    Like you, I found that there are no male 2mm ribbon cable connectors to use to connect to the HS3.  I used a PCB mount Molex 87832-1420 connector.

    For another project, I came across this board, which is a pitch adapter:

    https://oshpark.com/profiles/smartperson

    image.thumb.png.d239af1f3852c8f19cfebfc921fe329c.png

    Due to their size, they are relatively inexpensive.  The configuration on the right shows a pair of them ganged together to create a male to male 2mm adapter.

    The board design was published, allowing OshPark to sell them to whomever wants them.

    The through-hole 14-pin 2mm male connector is fairly easy to find (these are Sullins SBH21-NBPN-D07-ST-BK).  After clamping the two boards together,  pins from a standard 0.1" header were inserted, soldered, and trimmed off.  Not real pretty, but it works.  If you have the resources, you could simply make a small male-to-male board that is smaller.

    Again, I hope this helps.

    Don

  3. Starglow --

    I had a similar problem.  The ends of the Molex connectors are too close together to accept a normal 2mm ribbon connector.

    For the short term, you could saw the ends of the connector off with a razor saw.

    For the long term, we are using parts similar to 98424-G52-14LF from FCI.  It should accept either a ribbon cable or the HS3.

    Specifically, we are successfully using an 98424-G52-18LF part on our board.  We use an 18-pin ribbon cable to connect a "debugger board" that contains all of the circuits that we didn't have room for on our product board.  The extra four pins are used for setting the Zynq boot mode, provide power to the debugger board, and control a debug LED.

    The HS3 may be plugged into the center 14-pins of the connector in this scheme.  If you only add two additional pins, the alignment tab on the HS3 connector will not line up with the connector pins.

    The following describes our test fixture:

        One 14-pin male connector for the HS3 programmer

        One 18-pin male connector (center 14 pins tied to the connector above)

        An 18-pin ribbon cable (female on both ends) to connect the unit under test to the connector above.

    I hope this helps.

     

    will be plugged into the test fixture (14-pin male), be connected to an 18-pin male connector, jumpered over to the unit under test using an 18-pin ribbon cable (both ends female), and plugged into the unit under test.  This is proven to work.

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