From b092ffbcbe2c9398494f7dc9db6f0796971633e0 Mon Sep 17 00:00:00 2001 From: Rob Austein Date: Sun, 13 Sep 2020 23:04:30 +0000 Subject: Import Cryptech wiki dump --- raw-wiki-dump/DevBridgeBoard | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 raw-wiki-dump/DevBridgeBoard (limited to 'raw-wiki-dump/DevBridgeBoard') diff --git a/raw-wiki-dump/DevBridgeBoard b/raw-wiki-dump/DevBridgeBoard new file mode 100644 index 0000000..e601fda --- /dev/null +++ b/raw-wiki-dump/DevBridgeBoard @@ -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 [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]. \ No newline at end of file -- cgit v1.2.3