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Bus Pirate Development / Re: Bus Pirate "Ultra" v1a & v1b with ICE40 and Icestorm :)
5 IO pins, 1 analog pin, two power supplies, and pull-up voltage pin
3.3volt and 5volt power supplies
4 pullup resistors on MOSI, CLOCK, MISO, CS
But we also have some extra goodies:
ICE40 FPGA + STM32F103 MCU
Fully buffered interface with 1.2 to 5.0volts direct interfacing
2 serial SRAMs for a live-capture logic analyzer
A 32Mbit flash chip to hold tons of different bitstreams that can be loaded into the FPGA