Address space switching apparatus

Details Address space switching apparatus Address space switching apparatus

1988-09-30

1990-09-25

Eng, David Y.

Boots, shoes, and leggings

3642551, 3642552, G06F 934

Patent

active

049597787

ABSTRACT:
An address space switching apparatus has a group of conventional registers capable of storing address information and a group of additional registers capable of storing address information longer than the address information stored by the group of conventional registers. The register length of the group of additional registers is not restricted by the length of the group of conventional registers and is selected to be of a magnitude sufficient to define a desired operand address space. Information items stored in the group of additional registers such as a base address and an index value associated with the extended address space are selected when an operand address is to be generated so as to be appropriately employed for the address computation, thereby supplying address information having a length sufficient for the extended address space. On the other hand, when an address other than an operand address is to be created, information items stored in the group of conventional registers are selected so as to be utilized in the address computation.

REFERENCES:
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patent: 4003033 (1977-01-01), O'Keefe et al.
patent: 4149244 (1979-04-01), Anderson et al.
patent: 4244019 (1981-01-01), Anderson et al.
patent: 4453212 (1984-06-01), Gaither et al.
patent: 4651274 (1987-03-01), Omoda et al.
patent: 4670839 (1987-06-01), Pilat et al.
patent: 4675806 (1987-06-01), Uchida

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