NCT6627UD Nuvoton Technology Corporation of America, NCT6627UD Datasheet - Page 23

• Manufacturer Part Number: NCT6627UD
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of NCT6627UD

• Lead Free Status / Rohs Status: Supplier Unconfirmed

PFDCUART
FAN_SET
SYMBOL
HEFRAS
RTSA#
RTSB#
RTSC#
RTSD#
RTSE#
DTRA#
DTRB#
GP15
GP35
GP45
GP55
RTSF
DSA#
GP14
PIN
111
119
127
51
80
52
81
8
I/OD
I/OD
I/OD
I/OD
I/OD
OD
IN
IN
IN
O
O
I/O
O
O
O
O
O
O
12
24
cd
cd
cd
8
8
8
8
8
8
24
12t
12t
8
8
8
UART A Request To Send. An active-low signal informs the
modem or data set that the controller is ready to send data.
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-kΩ resistor to pull down this pin so as to ensure the selection
of I/O port’s configuration address to 2EH, and a 1-kΩ resistor is
recommended to pull it up if 4EH is selected as I/O port′s
configuration address.
UART B Request To Send. An active-low signal informs the
modem or data set that the controller is ready to send data. (This
is for W83627UHG only)
General-purpose I/O port 1 bit 5.
UART C Request To Send. An active-low signal informs the
modem or data set that the controller is ready to send data.
General-purpose I/O port 3 bit 5.
UART D Request To Send. An active-low signal informs the
modem or data set that the controller is ready to send data.
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%.
General-purpose I/O port 4 bit 5.
UART E Request To Send. An active-low signal informs the
modem or data set that the controller is ready to send data.
General-purpose I/O port 5 bit 5.
UART F Request To Send. An active-low signal informs the
modem or data set that the controller is ready to send data. (This
is for W83627UHG only)
Drive Select A. When set to 0, this pin enables disk drive A. This
is an open drain output.
UART A Data Terminal Ready. An active-low signal informs the
modem or data set that the controller is ready to communicate.
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 kΩ is reserved to pull down and a 1 kΩ resistor
is recommended if intends to pull-up to enable UART F.
UART B Data Terminal Ready. An active-low signal informs the
modem or data set that the controller is ready to communicate.
(This is for W83627UHG only)
General-purpose I/O port 1 bit 4.
DESCRIPTION
-14-
W83627UHG/NCT6627UD
Publication Release Date: October 26, 2010
Revision 1.7