FDC37C672 Просмотр технического описания (PDF) - SMSC -> Microchip

Номер в каталоге

Компоненты Описание

производитель

FDC37C672

Enhanced Super I/O Controller with Fast IR

SMSC -> Microchip 

Chapter 6 Floppy Disk Controller

Enhanced Super I/O Controller with Fast IR

Datasheet

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.

6.1

FDC Internal Registers

The Floppy Disk Controller contains eight internal registers which facilitate the interfacing between the host

microprocessor and the disk drive. Table 6.1 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.

PRIMARY

ADDRESS

3F0

3F1

3F2

3F3

3F4

3F4

3F5

3F6

3F7

3F7

Table 6.1 - Status, Data and Control Registers

(Shown with base addresses of 3F0 and 370)

SECONDARY

ADDRESS

R/W

REGISTER

370

R

Status Register A (SRA)

371

R

Status Register B (SRB)

372

R/W Digital Output Register (DOR)

373

R/W Tape Drive Register (TSR)

374

R

Main Status Register (MSR)

374

W Data Rate Select Register (DSR)

375

R/W Data (FIFO)

376

Reserved

377

R

Digital Input Register (DIR)

377

W Configuration Control Register (CCR)

SMSC FDC37C672

Page 18

DATASHEET

Rev. 10-29-03

Share Link: