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FDC37B72X

128 Pin Enhanced Super I/O Controller with ACPI Support

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 5

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 5 - 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)

15

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