FDC37B78X View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

Manufacturer

FDC37B78X

Enhanced Super I/O Controller with ACPI Support, Real Time Clock and Consumer IR

SMSC -> Microchip 

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 that facilitate the interfacing

between the host microprocessor and the disk

drive. TABLE 4 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 4 - STATUS, DATA AND CONTROL REGISTERS

(Shown with base addresses of 3F0 and 370)

PRIMARY SECONDARY

ADDRESS

ADDRESS

R/W

REGISTER

3F0

370

R Status Register A (SRA)

3F1

371

R Status Register B (SRB)

3F2

372

R/W Digital Output Register (DOR)

3F3

373

R/W Tape Drive Register (TSR)

3F4

374

R Main Status Register (MSR)

3F4

374

W Data Rate Select Register (DSR)

3F5

375

R/W Data (FIFO)

3F6

376

Reserved

3F7

377

R Digital Input Register (DIR)

3F7

377

W Configuration Control Register (CCR)

16

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