W83627DHG Datasheet, PDF (199/268 Pages) Winbond – WINBOND LPC I/O

W83627DHG
20.2 Logical Device 0 (FDC)
CR 30h. (Default 01h)
BIT READ / WRITE
DESCRIPTION
7~1 Reserved.
0
R/W
0: Logical device is inactive.
1: Activate the logical device.
CR 60h, 61h. (Default 03h,F0h)
BIT READ / WRITE
DESCRIPTION
7~0
R/W
These two registers select FDC I/O base address <100h: FF8h> on 8
bytes boundary.
CR 70h. (Default 06h)
BIT READ / WRITE
7~4 Reserved.
DESCRIPTION
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
7 Reserved.
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.
00: Model 30.
01: PS/2.
3~2
R/W
10: Reserved.
11: AT Mode
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Publication Release Date: Aug, 22, 2007
Version 1.4