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diff --git a/markdown/DevBridgeBoard.md b/markdown/DevBridgeBoard.md new file mode 100644 index 0000000..f4dde47 --- /dev/null +++ b/markdown/DevBridgeBoard.md @@ -0,0 +1,40 @@ +[[PageOutline]] + +# 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 [user/ft/stm32-dev-bridge/hardware/rev01](https://wiki.cryptech.is/browser/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]. |