Polish digital IP specialist Digital Core Design has come up with fully static 8-bit soft core that is software compatible with industry standard PIC 16xxx microcontrollers. The DRPIC166X soft core uses an enhanced Harvard architecture with separate instruction and data memories having independent address and data buses. The 14-bit program memory and 8-bit dual port data memory allow instruction fetch and data operations to occur simultaneously. The soft core supports a 1.3 GHz virtual clock frequency (800 MHz in 0.35 µm technology).
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http://www.elektor.com/news/8-bit-pic16 ... oprocessor