Dream MCU wishlist item 732: Simple, high-speed serial protocol for fast memory mapped point-to-point IO.
Basically "PCIe lite". 8b/10b coded ~1 Gbps full duplex LVDS with packetized memory read/write requests bridged directly to AHB on the MCU side.
But no PnP enumeration, no device addressing, no request reordering, none of the other complexity of full PCIe. Something you can hang off a Cortex-M7 and use for interfacing to a lower end FPGA faster than QSPI.
@azonenberg ST has a 8/16 bit PSSI that shares the DCMI interface on some MCU's. I use it to grab 8 bit data from an ice40, and I send commands over SPI. No reason you couldn't do it all on the PSSI port. Lots of traces though.
@azonenberg What about MIPI? I think I read something about sending commands, and using virtual channels. NXP has a M7 with CSI, and ST has the N6 with CSI whenever its released in 100 years or whatever.
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