FDC37C666GT View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
FDC37C666GT
SMSC -> Microchip
'FDC37C666GT' PDF : 152 Pages View PDF
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. The true CMOS 765B core
guarantees 100% IBM PC XT/AT compatibility
in addition to providing data overflow and
underflow protection.
FLOPPY DISK CONTROLLER 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.
The FDC37C665GT and FDC37C666GT are
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
SECONDARY
ADDRESS
REGISTER
370
R Status Register A
371
R Status Register B
372
R/W Digital Output Register
373
R/W Tape Drive Register
374
R Main Status Register
374
W Data Rate Select Register
375
R/W Data (FIFO)
376
Reserved
377
R Digital Input Register
377
W Configuration Control Register
SRA
SRB
DOR
TSR
MSR
DSR
FIFO
DIR
CCR
For information on the floppy disk on Parallel Port pins, refer to Configuration Register CR4
and Parallel Port Floppy Disk Controller description.
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