Floppy disk controller incorporating standby signal generating f

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Details

364273, 3642732, 3642735, 364DIG1, G06F 1300

Patent

active

055308767

ABSTRACT:
A floppy disk controller connected between a host system and several floppy disk units has a control circuit, a control register, and a standby control signal generating circuit. The control circuit is connected between the host system and the floppy disk units, and controls the floppy disk units. The control register is connected to the host system and to the floppy disk units, and has several ports, one for driving each floppy disk unit, the control register being written to by the host system. The standby control signal generating circuit is connected between all of the ports of the control register and the control circuit, and detects only a state where all of the floppy disk units are not driven, and always generates a standby control signal upon detection of this state, and transmits this standby control signal to the control circuit, to thereby move the control circuit from an operation mode to a standby mode. The floppy disk controller may also have a data register, a standby code decoder, and additional logic circuitry to transmit a standby control signal to the control circuit. The floppy disk controller may also have a digital output register having several ports, one to drive each of the floppy disk units, this digital output register being written to by the host system.

REFERENCES:
patent: 4980836 (1990-12-01), Carter et al.
patent: 5274277 (1993-12-01), Chan
patent: 5300831 (1994-04-01), Pham et al.
patent: 5388265 (1995-02-01), Volk
patent: 5404546 (1995-04-01), Stewart
"Method of Power On/Off Diskette Controller", IBM Technical Disclosure Bulletin, Sep. 29, 1986, vol. 29, No. 4, pp. 1723-1724.
"Method to Provide Low Power Standby Mode for Online Devices", IBM Technical Disclosure Bulletin, Apr. 1987, vol. 29, No. 11, p. 4763.

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