W83627EHF Datasheet, PDF (104/141 Pages) Winbond – evolving product from Winbonds most popular I/O family

W83627EHF/EF, W83627EHG/EG
CR 70h. (Default 06h)
BIT READ / WRITE
DESCRIPTION
7~4 Reserved.
3~0
R/W
These bits select IRQ resource for FDC.
CR 74h. (Default 02h)
BIT READ / WRITE
DESCRIPTION
7~3 Reserved.
These bits select DRQ resource for FDC.
2~0
R/W
000: DMA0. 001: DMA1. 010: DMA2.
1xx: No DMA active.
011: DMA3.
CR F0h. (Default 8Eh)
BIT READ / WRITE
DESCRIPTION
This bit controls the internal pull-up resistors of the FDC input pins
RDATA#, INDEX#, TRAK0#, DSKCHG# and WP#.
7
R/W
0: The internal pull-up resistors of FDC are turned on.
1: The internal pull-up resistors of FDC are turned off. (Default)
This bit determines the polarity of all FDD interface signals.
6
R/W
0: FDD interface signals are active low.
1: FDD interface signals are active high.
5
R/W
When this bit is logic 0, indicates a second drive is installed and is
reflected in status register A. (PS2 mode only)
Swap Drive 0, 1 Mode =>
4
R/W
0: No Swap.
1: Drive and Motor select 0 and 1 are swapped.
Interface Mode.
3~2
R/W
00: Model 30.
10: Reserved.
01: PS/2.
11: AT Mode
FDC DMA Mode.
0: Burst Mode is enabled
1
R/W
1: Non-Burst Mode.
Floppy Mode.
0
R/W
0: Normal Floppy Mode.
1: Enhanced 3-mode FDD.
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