W83627DHG Datasheet, PDF (140/268 Pages) Winbond – WINBOND LPC I/O

W83627DHG
10.2.3 Digital Output Register (DO Register) (Write base address + 2)
The Digital Output Register is a write-only register that controls drive motors, drive selection, DRQ/IRQ
enable, and FDC reset. The bit definitions are as follows:
7 6 5 4 3 2 1-0
Drive Select: 00 select drive A
01 Reserved
10 Reserved
11 Reserved
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
Reserved
Reserved
Reserved
10.2.4 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 for the
floppy disk drive.
In normal floppy mode, this register only has bits 0 and 1, and the bit definitions are as follows:
765 43 ²¹ 0
XX XX X X
Tape sel 0
Tape sel 1
If the three-mode FDD function is enabled (EN3MODE = 1 in LD0 CRF0, Bit 0), the bit definitions are
as follows:
765 43 ²¹ 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
Media ID1 Media ID0 (Bit 7, 6):
These two bits are read-only. These two bits reflect the value of LD0 CRF1, bits 5 and 4.
-128-
Publication Release Date: Aug, 22, 2007
Version 1.4