37C67X Datasheet, PDF (13/194 Pages) SMSC Corporation – ENHANCED SUPER I/O CONTROLLER WITH FAST IR

FLOPPY DISK CONTROLLER
FDC INTERNAL REGISTERS
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 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 (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)
13