W83627DHG Nuvoton Technology Corporation of America, W83627DHG Datasheet - Page 145

• Manufacturer Part Number: W83627DHG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627DHG

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

10.2.8 Digital Input Register (DI Register) (Read base address + 7)
The Digital Input Register is an 8-bit, read-only register used for diagnostic purposes. In PC/XT or
PC/AT mode, only bit 7 is checked by the BIOS. When the register is read, bit 7 shows the complement
of DSKCHG#
In PS/2 mode, the bit definitions are as follows:
DSKCHG (Bit 7):
This bit indicates the complement of the DSKCHG# input.
Bit 6-3: These bits are always a logic 1 during a read.
DRATE1 DRATE0 (Bit 2, 1):
These two bits select the data rate of the FDC. See DR register bits 1 and 0 (Data Rate Register (DR
Register) (Write base address + 4)) for how the settings correspond to individual data rates.
HIGHDENS# (Bit 0):
0
1
In PS/2 Model 30 mode, the bit definitions are as follows:
500 KB/S or 1 MB/S data rate (high-density FDD)
250 KB/S or 300 KB/S data rate
,
while the other bits remain in tri-state. The bit definitions are as follows:
7
x
6
x
5
x
7
4
1
6
x
3
1
5
x
x
2
1
4
Reserved for the hard disk controller
During a read of this register, these bits are in tri-stat
x
1
1
3
x
0
2
-133-
DSKCHG
1
0
HIGH DENS#
DRATE0
DRATE1
DSKCHG
Publication Release Date: Aug, 22, 2007
W83627DHG
Version 1.4