Method of dynamically changing formation of addresses in memory

Details Method of dynamically changing formation of addresses in memory Method of dynamically changing formation of addresses in memory

1984-10-29

1987-06-09

Shaw, Gareth D.

Boots, shoes, and leggings

364900, G06F 1300

Patent

active

046725385

ABSTRACT:
There is provided a method of dynamically changing the formation of addresses in a memory of a data processing system having a segment descriptor register adapted to hold segment descriptor words for prescribing segments containing instruction words and data stored in the memory and having memory addresses, an address register for designating addresses of the data, and an instruction counter for designating addresses of the instruction words. The method comprises a first step for storing the segment descriptor words in the segment descriptor register, a second step for controlling by the segment descriptor register the number of effective bits of the address register and instruction register, a third step for forming an address of an instruction word by adding the content of the segment descriptor register and the content of the effective bits of the instruction counter, and a fourth step for forming an address of a data by adding the content of the segment descriptor register, the content of the effective bits of the address register and the address in the instruction word.

REFERENCES:
patent: 4050060 (1977-09-01), Birney et al.
patent: 4281392 (1981-07-01), Grants et al.
patent: 4408274 (1983-10-01), Wheatley et al.
patent: 4453212 (1984-06-01), Gaither et al.
patent: 4466056 (1984-08-01), Tanahashi

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