W83877 Winbond Electronics Corp America, W83877 Datasheet - Page 34

• Manufacturer Part Number: W83877
• Description: Winbond I/O
• Manufacturer: Winbond Electronics Corp America

0
1
2.2.3 Digital Output Register (DO Register) (Write base address + 2)
The Digital Output Register is a write-only register controlling drive motors, drive selection, DRQ/IRQ
enable, and FDC resetting. All the bits in this register are cleared by the MR pin. The bit definitions
are as follows:
2.2.4 Tape Drive Register (TD Register) (Read base address + 3)
This register is used to assign a particular drive number to the tape drive support mode of the data
separator. This register also holds the media ID, drive type, and floppy boot drive information of the
floppy disk drive. In normal floppy mode, this register includes only bit 0 and 1. The bit definitions are
as follows:
If three mode FDD function is enabled (EN3MODE = 1 in CR9), the bit definitions are as follows:
DSC (Bit 0):
Drive C has been selected
Drive C has not been selected
7
6
5
7
4
6
X
7
3
X
5
6
5
X
2
4
X
4
3
1-0
X
3
2
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Drive Select: 00 select drive A
Floppy Disk Controller Reset
Active low resets FDC
DMA and INT Enable
Active high enable DRQ/IRQ
Motor Enable A. Motor A on when active high
Motor Enable B. Motor B on when active high
Motor Enable C. Motor C on when active high
Motor Enable D. Motor D on when active high
X
2
1
1
0
0
Tape Sel 0
Tape Sel 1
Floppy boot drive 0
Floppy boot drive 1
Drive type ID0
Drive type ID1
Media ID0
Media ID1
01 select drive B
10 select drive C
11 select drive D
Tape sel 1
Tape sel 0
W83877F