Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1992-01-10
1994-10-18
Robertson, David L.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
395425, 3692472, 3692543, 369DIG1, G06F 1206, G06F 1300
Patent
active
053576195
ABSTRACT:
An apparatus and method for supplying an address and data to an external memory device. The number of pins available for supplying the address is less than the number of address lines required at the external memory device. A register is used to store the high order bits of the address and is pre-loaded with a default page value. An output of the register is coupled to an address input of the external memory. If the high order bits of the address are equal to the default page value, a control device couples the data lines directly to the external memory device and a read or write operation follows. If the two values are different, a paging cycle is performed where the high order address bits are latched through the register to the address input of the external memory and then the data bits are coupled to the external memory device. If the default page value points to the most accessed portion of the external memory device, no paging is performed during access to that portion of the external memory and processing time is saved when reads or writes of data are made to that portion of the external memory.
REFERENCES:
patent: 4158227 (1979-06-01), Baxter et al.
patent: 4495563 (1985-01-01), McDonough
patent: 4768146 (1988-08-01), Nagashima et al.
patent: 4831522 (1989-05-01), Henderson et al.
patent: 5047989 (1991-09-01), Canepa et al.
Bruce Paul L.
Choi Clinton
Crook Neal A.
Galuszka Robert J.
Gavin Vincent G.
Digital Equipment Corporation
Robertson David L.
Whitfield Michael A.
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