W83627EHF Datasheet, PDF (105/141 Pages) Winbond – evolving product from Winbonds most popular I/O family

W83627EHF/EF, W83627EHG/EG
CR F1h. (Default 00h)
BIT READ / WRITE
DESCRIPTION
Boot Floppy.
7~6
R/W
00: FDD A.
10: FDD C.
01: FDD B.
11: FDD D.
5~4
R/W
Media ID1, Media ID0. These bits will be reflected on FDC’s Tape Drive
Register bit 7, 6.
Density Select.
3~2
R/W
00: Normal.
01 Normal.
10: 1 (Forced to logic 1).
11: 0 (Forced to logic 0).
DISFDDWR =>
1
R/W
0: Enable FDD write.
1: Disable FDD write (forces pins WE, WD stay high).
SWWP =>
0
R/W
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
7~6
R/W
FDD D Drive Type.
5~4
R/W
FDD C Drive Type.
3~2
R/W
FDD B Drive Type.
1~0
R/W
FDD A Drive Type.
DESCRIPTION
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.
Data Rate Table selection (Refer to TABLE A).
4~3
R/W
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).
Publication Release Date: January 18, 2006
-99-
Revision 1.0