FDC37C78_07 SMSC [SMSC Corporation], FDC37C78_07 Datasheet - Page 70

• Manufacturer Part Number: FDC37C78_07
• Description: Floppy Disk Controller
• Manufacturer: SMSC [SMSC Corporation]

CR1F
This register can only be accessed in the Configuration Mode and after the CSR has been initialized
to 1FH. The default value of this register after power up is 00H. This register indicates the Drive Type
used for each drive. Refer to CR0B for Data Rate Table register.
DTx = Drive Type select
Note:
0
0
1
1
DT0
DT0
D7
DENSEL, DRATE1 and DRATE0 map onto two output pins DRVDEN0 and DRVDEN1.
FDD3
0
1
0
1
DT1
DT1
D6
DENSEL
DRATE1
nDENSEL
DRATE0
DRVDEN0
(Note)
DT0
D5
DRATE0
DRATE0
DRATE0
DRATE1
FDD2
DRVDEN1
(Note)
DT1
D4
4/2/1 MB 3.5"
2/1 MB 5.25" FDDS
2/1.6/1 MB 3.5" (3-MODE)
70
DT0
D3
FDD1
DT1
D2
Drive Type
DT0
D1
FDD0
DT1
D0