FDC37C669_07 SMSC [SMSC Corporation], FDC37C669_07 Datasheet - Page 132

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

CR1F
This register can only be accessed in the
Configuration Mode and after the CSR has
been initialized
DTx = Drive Type select
CR20
This register can only be accessed in the
Configuration Mode and after the CSR has been
initialized to 20H.
register after power up is 3CH. This register is
used to select the base address of the floppy
disk
Note:
ADR9
DT0
DB7
D7
controller
FDD3
0
0
1
1
DENSEL, DRATE1 and DRATE0 map onto two output pins DRVDEN0 and DRVDEN1.
DT0
ADR8
DB6
DT1
D6
to 1FH. The default value
(FDC).
0
1
0
1
The default value of this
DT1
ADR7
DB5
DT0
DENSEL
DRATE1
nDENSEL
DRATE0
D5
DRVDEN0
The
(Note)
FDD2
FDC
ADR6
DB4
DT1
D4
DRATE0
DRATE0
DRATE0
DRATE1
can
DRVDEN1
(Note)
132
of this register after power up is 00H.
register indicates the Drive Type used for each
drive.
register.
be set to 48 locations, on 16 byte boundaries
from 100H-3F0H.
ADR9 and ADR8 to zero.
Upper Address Decode requirements: nCS='0'
and A10='0' are required to access the FDC
registers. A[3:0] are decoded as 0XXXb.
ADR5
DT0
DB3
D3
4/2/1 MB 3.5"
2/1 MB 5.25" FDDS
2/1.6/1 MB 3.5" (3-MODE)
PS/2
FDD1
Refer to CR0B for Data Rate Table
ADR4
DT1
DB2
D2
Drive Type
To disable the FDC, set
DB1
DT0
D1
0
FDD0
DB0
DT1
D0
0
This