[hpsdr] HPSDR - FPGA updating

[Bruce Beford]

Roger- my comments in-line below. -Bruce N1RX

Roger wrote:

> I want to make sure I understand the physical 'rules' for programming 
> the HPSDR Boards 'in situ' on the Atlas backplane, so I don't cause any 
>problems when I do said programming.

> From my reading of the postings to this list, I believe what is below 
> is a correct, complete, and not-overdetermined set of rules.  Is this 
> correct?

> 1.  Ozy must be the most distant board from the Atlas Power connector

N1RX: Ozy (or Magister, once released) should be the most-distant with an
FPGA. For instance, Excalibur -could be- in position 6, and Ozy in slot 5.

> 2.  The board closest to the Atlas Power connector must have the 'last 
> JTAG' jumper in place.  This jumper should be left 'open' on other boards.

N1RX: Correct

> 3.  If the boards are not sequentially positioned [i.e., if there are 
> any gaps between the boards where an Atlas connector is left empty] or 
> if the slot closest to the Atlas power connector is empty, then these 
> empty slots must be filled with a DIN 41612 male plug [e.g. Mouser 
> 617-09-03-196-6921] that has pins A27 and A29 shorted together.

N1RX: Actually, there is no need for the expense of a DIN96 plug. You can
simply use a three pin length of 0.1" spacing SIP strip, such as is used for
the various headers on the boards. Solder a jumper between the two end pins
of this home-made 3 pin plug, and plug it into the empty Atlas socket(s)
between pins A27-A29.

> Are these three rules correct, necessary, and sufficient?

N1RX: Yes, with the notes above.

> And two final requests for confirmation so all 'necessary' information 
> can be found in one place for future reference:  it appears to me that 
> the "A" terminals [e.g. A27 and A29] on the DIN 41612 connectors are 
> those that are furthest from the Atlas power connector.  It appears that 
> pin 1 is on the right and pin 32 is on the left, as one looks from the 
> Atlas power connector towards the far end of the board.  Are these 
> statements correct?

N1RX: This is an accurate description of the pin numbering.

73,
Bruce N1RX



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