FDC37M81x SMSC Corporation, FDC37M81x Datasheet - Page 15
FDC37M81x
Manufacturer Part Number
FDC37M81x
Description
PC98/99 Compliant Enhanced Super I/O Controller
Manufacturer
SMSC Corporation
Datasheet
1.FDC37M81X.pdf
(198 pages)
- Current page: 15 of 198
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FLOPPY DISK CONTROLLER
The Floppy Disk Controller (FDC) provides the
interface between a host microprocessor and the
floppy disk drive.
functions of the Formatter/Controller, Digital Data
Separator, Write Precompensation and Data Rate
Selection logic for an IBM XT/AT compatible FDC.
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.
The true CMOS 765B core guarantees 100% IBM
ADDRESS
PRIMARY
3F0
3F1
3F2
3F3
3F4
3F4
3F5
3F6
3F7
3F7
The FDC integrates the
SECONDARY
Table 2 - Status, Data and Control Registers
ADDRESS
(Shown with base addresses of 3F0 and 370)
370
371
372
373
374
374
375
376
377
377
R/W
R/W
R/W
R/W
W
W
R
R
R
R
15
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.
assumes that the primary addresses have been
selected.
Status Register A (SRA)
Status Register B (SRB)
Digital Output Register (DOR)
Tape Drive Register (TDR)
Main Status Register (MSR)
Data Rate Select Register (DSR)
Data (FIFO)
Reserved
Digital Input Register (DIR)
Configuration Control Register (CCR)
REGISTER
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