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Can we take a moment to admire the massive clusterfuck that is the SFF-8639/U.2 connector? Pick your interface: * SATA over S0 * SAS x2 over S0/S1 * PCIe x2 over S0/S1 (SATA Express) * PCIe x4 over PExx0-3 (U.2) * SAS x4 over S0/S1/PExx1/PExx2 * A mix! http://pinoutguide.com/HD/U.2_SATA_connector_pinout.shtml …
And this connector replaces the 3.3V power pins of the SATA power connector (which I guess no drives used?) with a reset pin, DevSLP#, and Wake#/SASAct2. Oh yeah and there's a pin for splitting the 4x PCIe lanes into 2 separate ports apparently.
Ah but there's a *new* 3.3V power pin in the gap between the SATA power/data pins, apparently for SMBus, along with *another* PCIe refclk besides the one SATA Express added, for dual-port usage. Yes this thing has SMBus too, why do you ask?
So kind of like USB-C?
USB-C only has two serdes lanes (plus one USB2 lane) to mux between stuff. This has *six*, and more sidebands and other junk than USB-C.
That's one more moment than it deserves. It's the weird spork in the back of your cutlery drawer of connectors.
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