Data processor with selectable word length

Details Data processor with selectable word length Data processor with selectable word length

2008-05-20

2008-05-20

Chan, Eddie (Department: 2183)

Electrical computers and digital processing systems: processing

Processing control

Mode switch or change

C712S205000

Reexamination Certificate

active

10457920

ABSTRACT:
An apparatus and method for selecting whether a central processing unit (CPU) performs instruction reading in units of 16 bits (a first word length) or in units of 32 bits (a second word length). Depending on whether instruction reading is performed in units of 16 bits or 32 bits, increment values (+2 and +4) by which a program counter (PC) is incremented are switched. Data reading or writing is performed in units of a given data length irrespective of the selecting unit. When the CPU issues a request for instruction reading in units of 16 bits or 32 bits or for data reading or writing, a bus control unit performs reading or writing a predetermined number of times according to a bus width designated for a resource located at an address specified in the request.

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