Our current product consists of a iNTEL XSCALE PXA255 processor plus industry standard interface ICs. For a new generation product we have to design a SOC with an embedded ARM core. To prototype this system we want to use readily available ARM controller plus a few FPGAs. Now I am searching for a silicon vendor that sells high performance ARM cores as a stand-alone chip.
So far I found Atmel as a potential supplier but the clock frquency of these ARM's is quite low, compared to the 400MHz XSCALE.
Question is whether anyone knows of a list of suppliers that supply high-performance (on par with PXA255 @ 400MHz) ARM cores implemented as a single standalone chip to prototype en debug our SOC development. Best would be a CPU only package, without any peripherials.