Method of accessing paged memory by an input-output unit

Details Method of accessing paged memory by an input-output unit Method of accessing paged memory by an input-output unit

1977-05-02

1979-11-06

Springborn, Harvey E.

Boots, shoes, and leggings

G06F 300, G06F 920

Patent

active

041737830

ABSTRACT:
In a data processing system employing paging and segmentation for storing information in memory, the input-output unit is provided with addressing capability for addressing and accessing memory without the intervention of the central processing unit to convert virtual addresses to absolute addresses. Paged tables are set up in memory by the central processing unit prior to input-output operations containing page table words, and a page table is assigned to each peripheral. A peripheral control word assigned to each peripheral includes a pointer to the start of the peripheral's page table whereby the peripheral through the I/O unit and without central processing intervention can locate its assigned page table, and page table words therein are used independent of any central processor virtual to absolute address conversion to access paged memory locations.

REFERENCES:
patent: 3413609 (1968-11-01), Boyle et al.
patent: 3675214 (1972-07-01), Ellis et al.
patent: 3704453 (1972-11-01), Blackwell et al.
patent: 3787813 (1974-01-01), Cole et al.
patent: 3938096 (1976-02-01), Brown et al.
patent: 4060849 (1977-11-01), Bienvenu et al.

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