Memory controller for sub-memory unit such as disk drives

Details Memory controller for sub-memory unit such as disk drives Memory controller for sub-memory unit such as disk drives

1991-01-31

1994-04-26

Bowler, Alyssa H.

Boots, shoes, and leggings

36424341, 3641483, 3649705, 3642327, 364DIG1, 364DIG2, 365 49, G06F 1300, G06F 1342

Patent

active

053074718

ABSTRACT:
A controller coupled to a host system, an external storage unit and a temporary memory performs a simultaneous data transfer thereamong. The controller includes an interface unit coupled to the host system, a buffer memory coupled to the external storage unit, a data transfer control unit coupled to the interface unit and the buffer memory, and a bus interconnecting the interface unit, the buffer memory and the temporary memory to one another. The data transfer control unit includes sequencing circuitry for generating first and second enable-signals substantially simultaneously and then generating one of first and second read signals and one of second and first write signals while instructing the temporary memory to fetch data onto the bus. The interface unit is supplied with the first enable-signal, the first read signal and the first write signal from the sequencing circuitry for outputting data therein onto the bus in response to the first read signal while receiving the first enable-signal and for fetching data on the bus in response to the first write signal while receiving the first enable-signal. The buffer memory is supplied with the second enable-signal, the second read signal and the second write signal from the sequencing circuitry for outputting data therein onto the bus in response to the second read signal while receiving the second enable-signal and for fetching data on the bus in response to the second write signal while receiving the second enable-signal.

REFERENCES:
patent: 4157587 (1979-06-01), Joyce et al.
patent: 4831520 (1989-05-01), Rubinfeld et al.
patent: 4851991 (1989-07-01), Rubinfeld et al.
patent: 5025366 (1991-06-01), Baror
patent: 5119485 (1992-06-01), Ledbetter, Jr. et al.

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