Ok. So I've completed the schematic wiring for data signals, and allocated PIC pins.
I've allocated 4 for ASIC data, one for CLK enable allowing to shut down a chain. And one for thermistor IN for external temp sense.
I have 3 free now. I can use one for an LED to indicate Hits and/or Work data. I don't need a pin for PWR as that can come from the 3.3V rail.
New parts added: LDO for AVCC on ASICs. 16 resistor pull ups for RST (rather than wiring them all around the board to one pullup).
I'm waiting on protocol info to determine how I'll handle DIN P/N to ASIC - either separate pins, manually twiddled or one pin and inverter to use UART. Or what? Depends on protocol.
I'm going to leave power to be controlled by ATX supply - no on/off on board (other than CLK disable which would cut power use almost completely). But I do have a pin that could be a manual reset if that was needed. I'm not sure about that. There will be a watch dog function that should be able to reset any software lock up.
Need a bit of rest before I dig into laying data tracks.
Also still need to confirm 100% that ASIC footprint in Avalon PCB is counter-clockwise.
bkk - will you me able to perform the assembly or at least, recommend anyone to do so?
At this time I'm not planning assembly. I'm not well situated for that. I can offer kits and wholesale part/board packages. When the design matures I will work with folks who want to assemble boards - assuming they understand that buying/licensing boards from me means I will try to help them. If they plan to just rip the design and do their own thing then I can't spend more effort on that. Simple respect IMO.
When I have a better understanding of who's doing what and providing a good service, I'll be happy to recommend them. This is the internet and Bitcoin after all - who has a clue what anyone's up to.