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-= dev-bridge board =

-In the process of developing the [wiki:AlphaBoardComponents] design, the project has made what is known as the "dev-bridge board".

-

-This is a board, 100x70 mm, with about 2/3 of the components intended to be on the Alpha design. What is missing is basically the FPGA and it's supporting circuits.

-

-To date, the dev-bridge board has been used to implement and validate the FMC based interface that will be used to connect the ARM and the FPGA on the Alpha.

-

-Schematics and layouts are at [https://wiki.cryptech.is/browser/user/ft/stm32-dev-bridge/hardware/rev01 user/ft/stm32-dev-bridge/hardware/rev01].

-

-High resolution pictures of rev01 of the dev-bridge board are attached at the bottom of this page, but the following should be more than sufficient to read the silkscreens.

-

-[[Image(dev-bridge_rev01_front_medium.jpg​)]]

-

-[[Image(dev-bridge_rev01_back_medium.jpg​)]]

-

-Here is the board mounted on the Novena, attached to the programmer:

-

-[[Image(IMG_9983s.jpg)]]

-

-Note that it's rather bigger than the Netgear enclosure I use to transport the Novena. (Not only does it protect the board, but I have this superstition that TSA is more comfortable with a home gateway than a bare motherboard.)

-

-Also note that the dev-bridge board is connected to the Novena by the

-high-speed expansion connector, which forms a bit of a pivot point.

-As Pavel says, "High speed and mechanical reliability are not very good

-friends usually."

-

-For that reason, I highly recommend stabilizing the board by bolting it to

-the Novena with a 5mm spacer. There are two through-holes that line up

-with mounting holes on the Novena, one at the corner and one next to the

-wifi connector.  I've found that even one bolt is enough to stabilize the

-board.

-

-Finally note that the board traces come rather close to the through-holes, so

-you want to avoid scraping them with the bolt head or the nut. I happen to

-be using a countersink-head bolt, which is beveled toward the shaft, but

-it's probably even better to use a nylon washer.

-

-All the software, as well as flashing instructions, are at [wiki:GitRepositories/sw/stm32].
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