Nice, just in time! Ordered my boards 1hr before your update, was still able to cancel them to adjust.
Feedback:
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One critical dimension is still missing, and that is the location off the locking screw for the cover door. It could be measured from the 3D orthographic view, but that’s not optimal. Only then can we be sure about the PCB-edge-to-cover-door offset by means of the cover door dimensions.
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What part number are these M2 standoffs? In the 3D view, they look to have threads, I expect that is not the case and the shell will have the threads instead. Additionally, previously they were 5.4mm holes, now they are 6.2mm - the only M2 (threaded) PCB inserts we used before needed 3.6mm only. I also can’t get any M2 spacers/standoffs that are this wide (~7.2-7.4mm?) - biggest are 5mm. So I suspect these are a special model (maybe soldered on?)
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What part number are the FXBeam interposer standoffs? Or, if they are custom, are they soldered or can we pick them off our default board?
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Can you confirm the fan connector pinout and part number? In the SSD reference design, it is Pin 1 = GND (for JST-like connector A1001WR-S-04PNLNT1T00R), now it’s flipped, Pin 4 = GND and a totally different connector type (FPC). The part number specified is AFC58-S04FIA-R1, which we cannot find online. Could it perhaps be AFC05-S04FIA? That one looks very similar to some prototype board pictures and has a similar name. It looks to be a standard FPC connector, if it is, could you provide the dimensions of the fan FPCs so we can choose a suitable connector?
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Next to each fan connector, there seem to be holes for plastic pins. The right one changed shape from last revision and is now oval and thus would not fit the same circular pin. Is this intentional? Both plastic pins in the 3D model look to be the same and circular
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You’ve reduced the space around the FXBeam connector needed to route all the pins greatly with this revision, making it nearly impossible to work with cheap 4 layer boards. Can you confirm the board space really needs to be free? White is the original outline, turquise is the new one. In red is what I had hoped was available from all the images we saw (and the GPU does use that space).
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The FXBeam pinout in the doc has some different names at least, and different control signals at worst. E.g. PF3/PG3 now has a I2C (_VS) pinout, whereas previously it was EXT_SSD1_RST#/EXT_SSD2_RST#. These sound like completely different signals to me. Are these alternate pinouts just like PWR_GOOD/DP_A_AUX for an additional PCIe REFCLK? if so, how are these switched/controlled?
Thank you for giving us more information already, before even the Expansion Bay deep dive, it’s greatly appreciated - let’s hope the rest is filled in in time for it. At least what’s there now is enough information to get the boards themselves mostly done (but sadly not fully)