Processor and method of automatic instruction mode switching...

Details Processor and method of automatic instruction mode switching... Processor and method of automatic instruction mode switching...

2006-12-12

2006-12-12

Fleming, Fritz (Department: 2181)

Electrical computers and digital processing systems: processing

Instruction decoding

Decoding instruction to accommodate variable length...

C712S208000

Reexamination Certificate

active

07149879

ABSTRACT:
A processor and method of automatic instruction mode switching between N-bit and 2N-bit instructions by using parity bit check. The processor and method includes an instruction input device having a memory for storing a plurality of 2N-bit words, an instruction fetch device fetching a 2N-bit word from the memory, and a mode switch logic determining whether the 2N-bit word fetched by the instruction fetch device is two (N-P)-bit instructions or one 2(N-P)-bit instruction to accordingly switch the processor to corresponding N-bit or 2N-bit mode, wherein when the 2N-bit word fetched is even parity, the 2N-bit word is determined as two (N-P)-bit instructions if two N-bit words included in the 2N-bit word are on the even parity state, or determined as a 2(N-P)-bit instruction if the two N-bit words are on the odd parity state.

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