FDC37C669_07 SMSC [SMSC Corporation], FDC37C669_07 Datasheet - Page 18

• Manufacturer Part Number: FDC37C669_07
• Description: PC 98/99 Compliant Super I/O Floppy Disk Controller with Infrared Support
• Manufacturer: SMSC [SMSC Corporation]

FLOPPY DISK CONTROLLER
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.
guarantees 100% IBM PC XT/AT compatibility
in addition to providing data overflow and
underflow protection.
The FDC37C669 is
82077AA using SMSC's proprietary floppy disk
controller core.
For information on the floppy disk on Parallel Port pins, refer to Configuration Register CR4
and Parallel Port Floppy Disk Controller description.
ADDRESS
BASE I/O
+0
+1
+2
+3
+4
+4
+5
+6
+7
+7
The true CMOS 765B core
compatible
Table 2 - Status, Data and Control Registers
R/W
R/W
R/W
W
W
R
R
R
R
to
Status Register A
Status Register B
Digital Output Register
Tape Drive Register
Main Status Register
Data Rate Select Register
Data (FIFO)
Reserved
Digital Input Register
Configuration Control Register
the
18
REGISTER
FLOPPY
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
FDC description assumes the Base I/O Address
is 3F0.
DISK
CONTROLLER
FIFO
DOR
MSR
CCR
SRA
SRB
TSR
DSR
DIR
INTERNAL