In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Electronegativity wrote:

75 Mhz would be fine but it seems like it would be a nightmare to synchronize two processors running at different speeds.

75 MHz would be fine, but the real issue is synchronization.

This all came as a result of trying to figure out the fastest way to get data in and out of the Propeller.

A 4M SRAM has an 8 bit parallel interface and requires 19 more pins for addressing, plus a few more pins to set the read/write state and clock. Since the Propeller only has 32 I/O pins I was thinking that I could use the SX52 to provide the address and other information while hooking up the 8 data lines to the propeller. 

That would let me move data in and out quickly and still have 24 configurable pins.

I suppose I could try to come up with some kind of asynchronous handshaking protocol, but life would be golden and wonderful if I could synchronize both MPUs.

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