FDC37M607 datasheet(12/182 Pages) SMSC

12 / 182 page

FLOPPY DISK CONTROLLER

The Floppy Disk Controller (FDC) provides the

interface between a host microprocessor and

the floppy disk drives. The FDC integrates the

functions of the Formatter/Controller, Digital

Data Separator, Write Precompensation and

Data Rate Selection logic for an IBM XT/AT

compatible FDC.

The true CMOS 765B core

guarantees 100% IBM PC XT/AT compatibility

in addition to providing data overflow and

underflow protection.

The FDC is compatible to the 82077AA using

SMSC's proprietary floppy disk controller core.

FDC INTERNAL REGISTERS

The

Floppy

Disk

Controller

contains

eight

internal registers which facilitate the interfacing

between the host microprocessor and the disk

drive. Table 2 shows the addresses required to

access these registers. Registers other than the

ones shown are not supported. The rest of the

description assumes that the primary addresses

have been selected.

Table 2 - Status, Data and Control Registers

(Shown with base addresses of 3F0 and 370)

PRIMARY

ADDRESS

SECONDARY

ADDRESS

R/W

3F0

3F1

3F2

3F3

3F4

3F5

3F6

3F7

370

371

372

373

374

375

376

377

R/W

Status Register A (SRA)

Status Register B (SRB)

Digital Output Register (DOR)

Tape Drive Register (TSR)

Main Status Register (MSR)

Data Rate Select Register (DSR)

Data (FIFO)

Reserved

Digital Input Register (DIR)

Configuration Control Register (CCR)

FDC37M607 Datasheet(PDF) 12 Page - SMSC Corporation

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