FDC37M817-MS 查看數據表（PDF） - SMSC -> Microchip

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FDC37M817-MS

PC98/99 Compliant Enhanced Super I/O Controller with Keyboard/Mouse Wake-Up

SMSC -> Microchip 

FLOPPY DISK CONTROLLER

FDC INTERNAL REGISTERS

The Floppy Disk Controller (FDC) provides the

interface between a host microprocessor and the

floppy disk drive. 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 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.

The FDC is compatible to the 82077AA using

SMSC's proprietary floppy disk controller core.

PRIMARY

ADDRESS

3F0

3F1

3F2

3F3

3F4

3F4

3F5

3F6

3F7

3F7

Table 2 - 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 (TDR)

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)

15

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