F71862
1-0 FDD_TYPE
R/W
11
FDD drive type.
Reserved.
FDD Selection Register Index F4h
Bit Name R/W Default
Description
7-5 Reserved
4-3 FDD_DRT
-
-
R/W
00
Data rate table select, refer to table A.
00: select regular drives and 2.88 format.
01: 3-mode drive.
10: 2 mega tape.
11: reserved.
2
Reserved
-
-
Reserved.
1-0 FDD_DT
R/W
00
Drive type select, refer to table B.
TABLE A
Data Rate Table Select
Data Rate
DATARATE1 DATARATE0
Selected Data Rate
DENSEL
FDD_DRT[1]
FDD_DRT[0]
MFM
500K
300K
250K
1Meg
500K
500K
250K
1Meg
500K
2Meg
250K
1Meg
FM
250K
150K
125K
---
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
0
250K
250K
125K
---
0
1
0
250K
---
1
125K
---
TABLE B
Drive Type
DRVDEN0
DENSEL
Remark
FDD_DT1
FDD_DT0
0
4/2/1 MB 3.5”
2/1 MB 5.25”
1/1.6/1 MB 3.5” (3-Mode )
0
0
1
1
1
0
1
DATARATE1
DENSEL#
DATARATE0
78
July, 2008
V.28P
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
