5 ms·
You won't have to. They can all be stacked.
by danbee 3y ago
You won't have to. They can all be stacked.
- SparkyMcUnicorn 3y agoWould active cooling work underneath another hat?
- mbreese 3y agoIt looks like the M2 socket will be connected with a flexible ribbon, so it is possible that it could be mounted below.
- bpye 3y agoAlso looks like PCIe is exposed via an FPC connector. You could probably come up with a scheme to have an M2 device mounted behind the board - if you really wanted. Only having a single lane of PCIe 2.0 is a little unfortunate. I wonder if the inevitable compute module will get more or not. It seems that their IO chip is also attached via PCIe but it provides a lot of the interfaces that you’d expect to have - so my hunch is that it’ll be included on any CM5.
- rasz 3y agoit can be forces into "experimental" 3.0 mode so thats something.
- arwhatever 3y agoThen surely there must be competition or a record for “tallest ever,” hopefully requiring each layer to be functional.
- extraduder_ire 3y agoI think you can have over a hundred different i2c devices connected to the same bus, so it'd get pretty tall if you can power them all. 10-bit i2c (not very common) can do almost a thousand. Although, you'd need specific rules if you wanted to prevent someone just layering up always-on LED boards.
- dmitrygr 3y ago> you can have over a hundred different i2c devices connected to the same bus In theory sure, in a world with zero-inductance zero-capacitance busses and infinite-sink-current drivers. In our reality, however, you'll start having issues and start requiring stronger pullups and lower speeds long before you get to a hundred.
- dfox 3y agoOne pretty popular home alarm brand uses I2C as “the bus” with somewhat ridiculously large cable lengths for what was designed as a board/enclosure level cheap serial bus. It is in no way a sane design, but it seems to work.
- dmitrygr 3y agomaybe at a 100Hz clock rate?
- monocasa 3y agoThis reminds me of one of the dirtiest things I've seen in this space. Saw i2c buses bridged across multiple chassis by bridging the boards with CAN transceivers. It mostly worked, but I feel like everyone who signed off on that design review should feel bad about the atrocity they created.