W83627UHG Nuvoton Technology Corporation of America, W83627UHG Datasheet - Page 114

• 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

9.3.6
The Data Rate Register is used to set the transfer rate and write precompensation. However, in PC-
AT and PS/2 Model 30 and PS/2 modes, the data rate is controlled by the CC register, not by the DR
register. As a result, the real data rate is determined by the most recent write to either the DR or CC
register. The bit definitions for this register are as follows:
DEFAULT
NAME
BIT
BIT
7
6
5
4
3
2
1
0
7
6
5
4
3
2
BIT
Data Rate Register (DR Register) (Write base address + 4)
Request for Master (RQM). A high on this bit indicates Data Register is ready to send or
receive data to or from the processor.
DATA INPUT/OUTPUT (DIO). If DIO = HIGH, then the transfer is from Data Register to
the processor. If DIO = LOW, the transfer is from processor to Data Register.
Non-DMA mode. The FDC is in the non-DMA mode, this bit is set only during the
execution phase in non-DMA mode.
FDC Busy (CB). A read or write command is in the process when CB = HIGH.
FDD 3 Busy. (D3B = 1) FDD number 3 is in the SEEK mode.
FDD 2 Busy. (D2B = 1) FDD number 2 is in the SEEK mode.
FDD 1 Busy. (D1B = 1) FDD number 1 is in the SEEK mode.
FDD 0 Busy. (D0B = 1) FDD number 0 is in the SEEK mode.
S/W RESET. The software reset bit.
POWER DOWN.
0: FDC in normal mode.
1: FDC in power-down mode.
0
PRECOMP 2.
PRECOMP 1.
PRECOMP 0.
RESET
S/W
7
0
POWER
DOWN
6
0
5
0
PRECOMP2
DESCRIPTION
DESCRIPTION
4
0
-103-
PRECOMP1
Selects the value of write precompensation.
The
precompensation
combination of these bits. Please see the
tables below.
3
0
Publication Release Date: May 25, 2007
following
PRECOMP0
2
0
tables
values
W83627UHG
DRATE1
1
1
show
for
Revision 1.0
DRATE0
every
0
0
the