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W83627DHG
Publication Release Date: Aug, 22, 2007
-188- Version
1.4
Continued
BIT
READ / WRITE
DESCRIPTION
1
R / W
FDC DMA Mode.
0: Burst Mode is enabled
1: Non-Burst Mode.
0
R / W
Floppy Mode.
0: Normal Floppy Mode.
1: Enhanced 3-mode FDD.
CR F1h. (Default 00h)
BIT
READ / WRITE
DESCRIPTION
7~6
R / W
Boot Floppy.
00: FDD A.
01: Reserved.
10:
Reserved.
11:
Reserved.
5~4
R / W
Media ID1, Media ID0. These bits will be reflected on FDC’s Tape Drive
Register bit 7, 6.
3~2
R / W
Density Select.
00: Normal.
01: Normal.
10: 1 (Forced to logic 1).
11: 0 (Forced to logic 0).
1
R / W
DISFDDWR =>
0: Enable FDD write.
1: Disable FDD write (forces pins WE, WD to stay high).
0
R / W
SWWP =>
0: Normal, use WP to determine whether the FDD is write protected or not.
1: FDD is always write-protected.
CR F2h. (Default FFh)
BIT
READ / WRITE
DESCRIPTION
7~2 Reserved.
1~0
R / W
FDD A Drive Type.
CR F4h. (Default 00h)
BIT
READ / WRITE
DESCRIPTION
7 Reserved.
6
R / W
0: Enable FDC Pre-compensation.
1: Disable FDC Pre-compensation.
5 Reserved.
4~3
R / W
Data Rate Table selection (Refer to TABLE A).
00: Select regular drives and 2.88 format.
01: 3-mode drive.
10: 2 Meg Tape.
11: Reserved.
2 Reserved.
1~0
R / W
Drive Type selection (Refer to TABLE B).
Summary of Contents for W83627DHG
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