Hiya, Goal: Ok so I'm after a high speed synchronous serial interface (50mhz would be nice) with reasonably flexible clocking options so I can tweak it up and down. The goal is to implement a "fast as possible" SWD debug interface to a Cortex M0; ideally the serial interface could be run arbitrarily fast until the target M0 or the wiring can't handle it.  If can do 48mhz I can basically read/write one 32-bit word per microsecond over swd, so 4MB/sec, and I want to process that a little