Instruction length determination device and method using...

Details Instruction length determination device and method using... Instruction length determination device and method using...

2011-02-22

2011-02-22

Coleman, Eric (Department: 2183)

Electrical computers and digital processing systems: processing

Instruction decoding

Decoding instruction to accommodate variable length...

C712S208000

Reexamination Certificate

active

07895414

ABSTRACT:
An instruction length determination device includes an instruction input unit having a memory space to store a plurality of N-bit data; an instruction fetch unit which fetches the plurality of N-bit data from the instruction input unit; an instruction length determination logic which compares concatenate bits of a first N-bit data with a predetermined value for determination of an instruction length; and an instruction concatenate unit which selectively concatenates a number of successive N-bit data based on the determination. The instruction length determination logic determines that the first N-bit data is a complete instruction when the concatenate bit of the first N-bit data is not equal to the predetermined value. Otherwise, the instruction length determination logic determines that a complete instruction is formed of last N-bit data finally fetched and all N-bit previously reserved.

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