Digital data storage apparatus

Details Digital data storage apparatus Digital data storage apparatus

1982-12-03

1987-01-20

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 1200

Patent

active

046384545

ABSTRACT:
Digital data storage apparatus includes a data store DS having a plurality of multiple-bit word locations, and validity store VS having a lesser plurality of multiple-bit word locations arranged such that each separate bit corresponds to a separate word location in the data store. A first auxiliary store AS1 has a number of bit locations at least equal to the number of word locations in the validity store with each bit identifying the status of the validity bits in a separate word of the validity store. A number of further auxiliary stores are also provided, arranged in increasing order of significance and each having a lesser plurality of bit locations each of which corresponds to a separate word location in the next less significant auxiliary store. Circuit means CM are provided and connected in such a way that areas of the data store may be declared valid or invalid by setting appropriate bits in each of the auxiliary stores. Any area of the data store may be declared invalid in not more than two cycles.

REFERENCES:
patent: 3241125 (1966-03-01), Tomasulo et al.
patent: 3742458 (1973-06-01), Inoue et al.
patent: 4438512 (1984-03-01), Hartung et al.

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