Integrated floppy disk drive controller

Details Integrated floppy disk drive controller Integrated floppy disk drive controller

1986-12-18

1988-05-03

Harkcom, Gary V.

Boots, shoes, and leggings

G06F 1312, G06F 306

Patent

active

047424486

ABSTRACT:
A floppy disk drive controller interface implemented as an integrated circuit on a single semi-conductor chip. The controller connects to a host computer data bus and one or more floppy disk drives. Based upon clocking and control signals received from a digital computer, the controller generates serial encoded data for recording on a floppy disk and receives serial encoded data previously recorded on a floppy disk. The controller comprises a read control circuit including a read data register, write control means including a write data register, a mode register, a status register, state latches, a decoder and special function registers. The controller operates by the setting and clearing of the state latches and reading or writing the mode register, the status register, the special function registers, the read data register and the write data register. The setting of a state latch and accessing of a register is done simultaneously. The controller, under software control, operates in a synchronous or asynchronous read/write mode, and slow or fast read/write mode.

REFERENCES:
patent: 4100601 (1978-07-01), Kaufman et al.
patent: 4148098 (1979-04-01), MeCreight et al.
patent: 4210959 (1980-07-01), Wozniak
patent: 4357657 (1982-11-01), Fellinger
patent: 4423480 (1983-12-01), Bauer et al.
patent: 4433378 (1984-02-01), Leger
patent: 4494196 (1985-01-01), Greer
patent: 4549262 (1985-10-01), Chung et al.
Western Digital; May 1980; FD179X-02 Floppy Disk Formatter/Controller Family; 24 pages.
Zaks; 1979; Microprocessor Interfacing Techniques; pp. 198-207.
Intel, 8271/2 Data Sheets, 1979.

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