Information processing system having mode signal holding means a

Details Information processing system having mode signal holding means a Information processing system having mode signal holding means a

1991-02-06

1993-12-28

Lee, Thomas C.

Boots, shoes, and leggings

395425, 3642329, 3642548, 364246, 364DIG1, G06F 934, G06F 1200

Patent

active

052747760

ABSTRACT:
In an information processing system including an operand accessing unit for accessing a main memory to read an operand for a current instruction, the operand accessing unit comprises a mode flip-flop for holding a mode signal in response to a decoded signal supplied from an instruction analyzing memory. The mode signal indicates that whether or not a particular one of instructions of a second kind is executed by an executing unit as the current instruction. Connected to a control storage unit, a memory access mode register holds a memory access mode bit indicative of a memory access mode which defines an access mode for the main memory. The memory access mode bit is renewed by a processed signal supplied from the control storage unit. A predetermined access mode register holds a predetermined access mode bit indicative of a predetermined access mode. Connected to the mode flip-flop, the memory access mode register, and the predetermined access mode register, an access mode selector selects one of the memory access mode bit and the predetermined access mode bit as a selected access mode bit indicative of a selected access mode. Connected to the access mode selector, an instruction fetching unit, and the main memory, an operand fetching unit fetches the operand in accordance with the selected access mode indicated by the selected access mode bit.

REFERENCES:
patent: 4736289 (1988-04-01), Eaton
patent: 4782443 (1988-11-01), Matsumoto
patent: 4928237 (1990-05-01), Bealkowski et al.
patent: 5001627 (1991-03-01), Sakamoto
patent: 5038280 (1991-08-01), Watanabe et al.
patent: 5142630 (1992-08-01), Ishikawa

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