Intel mcs-48 manual 8272

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8272

SINGLE/DOUBLE DENSITY FLOPPY DISK CONTROLLER

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IBM Compatible in Both Single and Double Density Recording Formats

Programmable Data Record Lengths: 128,256,512, or 1024 Bytes/Sector

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Data Transfers in DMA or Non·DMA Mode

Parallel Seek Operations on Up to Four Drives

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Multi·Sector and Multi·Track Transfer Capability

Drive Up to 4 Floppy Disks

Data Scan Capability - Will Scan a Single Sector or an Entire Cylinder's Worth of Data Fields, Comparing on a Byte by Byte Basis, Data in the Processor'sMemory with Data Read from the Diskette

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Compatible with Most Microprocessors Including 8080A, 8085A, 8086 and 8088

Slngle·Phase 8 MHz Clock

Single +5 Volt Power Supply

Available in 40·Pln Plastic Dual·ln·Llne Package

The 8272 is an LSI Floppy Disk Controller (FDG) Chip, which contains the circuitry and control functions for Interfacing a processor to 4. Floppy Disk Drives. It is capable of supporting either IBM 3740 single density format (FM), or IBM System 34 Double Density format (MFM) including double sided recording. The 8272 provides control signals which simplify the design of an external phase locked loop, and write precompensation circuitry. The FDC simplifies and handles most of the burdens associated with implementing a Floppy Disk Drive Interface.

PIN CONFIGURATION				8272 INTERNAL BLOCK DIAGRAM
RESET	Vee
liD	RWISEEK	0 8 0.7	DATA BUS	REGISTERS
			BUFFER
AO
	WPITS
				SERIAL
				INTERFACE
				CONTROLLER
		TERMINAL
		COUNT - .
		DRQ			.....-.-READY
		mK _			WRITE PROTECTITWO SIDE
		INT			INDEX
		liD_			FAULTITRACK 0
		WR ~ CONTROL
		Ao	~ LOGIC
		RESET ~		DRIVE	DRIVE SELECT 0
			L-.,..-....I	INTERFACE	DRIVE SELECT 1
				CONTROLLER	MFM MODE
					l'iW/SEEK
		elK			HEAD LOAD
			~		HEAD SELECT
		Vee	- ...		LOW CURRENT/DIRECTION
		GND ---+-			FAULT RESET/STEP

Intel Corporation Assumes No Responsibllty for the Use of Any Circuitry Other Than Circuitry Embodied in 8n Intel Product. No Other Circuit Patent Licenses are Implied.

© INTEL CORPORATION. 1980 9-51