W83627UHG Nuvoton Technology Corporation of America, W83627UHG Datasheet - Page 112

• Manufacturer Part Number: W83627UHG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627UHG

• Applications: PC's, PDA's
• Interface: LPC
• Voltage - Supply: 3.3V, 5V
• Package / Case: 128-XFQFN
• Mounting Type: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The Digital Output Register is a write-only register that controls drive motors, drive selection,
DRQ/IRQ enable, and FDC reset. All the bits in this register are cleared by the MR pin. The bit
definitions are as follows:
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:
DEFAULT
DEFAULT
9.2.3 Digital Output Register (DO Register) (Write base address + 2)
9.2.4 Tape Drive Register (TD Register) (Read base address + 3)
NAME
NAME
BIT
1-0
BIT
7-5
1-0
BIT
2
4
3
2
BIT
BIT
WE F/F. Indicates the complement of the latched WE# output pin.
Reserved.
Reserved.
MOTOR ENABLE A. A logical 1 enables Motor A.
DMA & INT ENABLE. A logical 1 enables DRQ/IRQ.
FDC RESET. Floppy Disk Controller Reset. A logical 0 resets the FDC.
DRIVE SELECT.
Bits
1 0
0 0: Select Drive A.
0 1: Select Drive B.
1 0: Select Drive C.
1 1: Select Drive D.
NA
7
0
7
RESERVED
NA
6
0
6
NA
5
0
5
RESERVED
ENABLE A
MOTOR
DESCRIPTION
DESCRIPTION
DESCRIPTION
-97-
NA
4
0
4
DMA&INT
ENABLE
NA
3
0
3
Publication Release Date: March 24, 2008
RESET
FDC
NA
2
0
2
W83627UHG
Tape sel 1
1
0
1
0
DRIVE SELECT
Revision 1.44
Tape sel 0
0
0
0
0