FDC37B80X SMSC [SMSC Corporation], FDC37B80X Datasheet - Page 13

• Manufacturer Part Number: FDC37B80X
• Description: PC98/99 Compliant Enhanced Super I/O Controller with Keyboard/Mouse Wake-Up
• Manufacturer: SMSC [SMSC Corporation]

FLOPPY DISK CONTROLLER
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.
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.
ADDRESS
PRIMARY
3F0
3F1
3F2
3F3
3F4
3F4
3F5
3F6
3F7
3F7
The true CMOS 765B core
SECONDARY
Table 2 - Status, Data and Control Registers
(Shown with base addresses of 3F0 and 370)
ADDRESS
370
371
372
373
374
374
375
376
377
377
R/W
R/W
R/W
R/W
W
W
R
R
R
R
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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.
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)
REGISTER