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W83627UHG
Publication Release Date: March 24, 2008
-8-
Revision 1.44
SYMBOL
PIN
I/O
DESCRIPTION
HEFRAS
INcd
During power-on reset, this pin is pulled down internally and is
defined as HEFRAS, which provides the power-on value for
CR26 bit 6 (HEFRAS). The PCB layout should reserve space for
a 1-k
Ω resistor to pull down this pin so as to ensure the selection
of I/O port’s configuration address to 2EH, and a 1-k
Ω resistor is
recommended to pull it up if 4EH is selected as I/O port
′s
configuration address.
RTSB#
O
8
UART B Request To Send. An active-low signal informs the
modem or data set that the controller is ready to send data.
GP15
80
I/OD
8
General-purpose I/O port 1 bit 5.
RTSC#
O
8
UART C Request To Send. An active-low signal informs the
modem or data set that the controller is ready to send data.
GP35
111
I/OD
8
General-purpose I/O port 3 bit 5.
RTSD#
O
8
UART D Request To Send. An active-low signal informs the
modem or data set that the controller is ready to send data.
FAN_SET
IN
cd
Determines the initial FAN speed. Power-on configuration for 2
fan speeds, 50% or 100%. During power-on reset, this pin needs
a pulled-up or a pull-down resistor to decide whether the fan
speed is 50% or 100%.
GP45
119
I/OD
8
General-purpose I/O port 4 bit 5.
RTSE#
O
12
UART E Request To Send. An active-low signal informs the
modem or data set that the controller is ready to send data.
GP55
127
I/OD
12t
General-purpose I/O port 5 bit 5.
RTSF
O
24
UART F Request To Send. An active-low signal informs the
modem or data set that the controller is ready to send data.
DSA#
8
OD
24
Drive Select A. When set to 0, this pin enables disk drive A. This
is an open drain output.
DTRA#
O
8
UART A Data Terminal Ready. An active-low signal informs the
modem or data set that the controller is ready to communicate.
PFDCUART
52
INcd
During power-on reset, this pin is pulled down internally and is
defined as FDC enable, which provides the power-on value for
CR24 bit 1. A 1 k
Ω is reserved to pull down and a 1 kΩ resistor
is recommended if intends to pull-up to enable UART F.
DTRB#
O
8
UART B Data Terminal Ready. An active-low signal informs the
modem or data set that the controller is ready to communicate.
GP14
81
I/OD
12t
General-purpose I/O port 1 bit 4.
DTRC#
O
8
UART C Data Terminal Ready. An active-low signal informs the
modem or data set that the controller is ready to communicate.
GP34
112
I/OD
12t
General-purpose I/O port 3 bit 4.
DTRD#
O
8
UART D Data Terminal Ready. An active-low signal informs the
modem or data set that the controller is ready to communicate.
GP44
120
I/OD
8t
General-purpose I/O port 4 bit 4.