MiTAC 7521 PLUS/N - Manual (Page 96)

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7521 7521 Plus / N N/B MAINTENANCE Plus / N N/B MAINTENANCE
5. Pin Descriptions Of Major Components
5.2 SiS630S Slot 1/Socket 370 2D/3D Ultra-AGP™ Single Chipset
RTC Interface
Name Tolerance Power
Plane
Type
Attr
Description
AUXOK 1.8V RTC I Auxiliary Power OK : This signal is supplied from
the power source of resume well. It is also used to
reset the logic in resume power well. If there is no
auxiliary power source on the system, this pin should
be tied together with PWROK.
BATOK 1.8V RTC I Battery Power OK: When the internal RTC is
enabled, this signal is used to indicate that the power
of RTC well is stable. It is also used to reset the logic
in RTC well. If the internal RTC is disabled, this pin
should be tied low.
OSC32KHI 1.8V RTC I RTC 32.768 KHz Input : When internal RTC is
enabled, this pin provides the 32.768 KHz clock
signal from external crystal or oscillator.
OSC32KHO <1.8V RTC O RTC 32.768 KHz Output : When internal RTC is
enabled, this pin should be connected with the other
end of the 32.768 KHz crystal or left unconnected if
an oscillator is used.
PWROK 1.8V RTC I Main Power OK : A high-level input to this signal
indicates the power being supplied to the system is in
stable operating state. During the period of PWROK
being low, CPURST and PCIRST# will all be
asserted until after PWROK goes high for 24 ms.
AC’97 interface
Name Tolerance Power
Plane
Type
Attr
Description
AC_BITCLK 3.3V/5V MAIN I AC’97Bit Clock : This signal is a 12.288MHz
serial data clock, which is generated by primary
Codec.
AC_RESET# 3.3V AUX O AC’97 Reset : Hardware reset signal for external
Codecs.
AC_SDIN[1:0] 3.3V/5V AUX I AC’97 Serial Data input : Serial data input from
primary Codec and secondary Codec.
AC_SDOUT 3.3V MAIN O AC’97 Serial Data output : Serial data output to
Codecs.
AC_SYNC 3.3V MAIN O AC’97 Syncronization : This is a 48KHz signal,
which is used to syncronize the Codecs.
SPDIF
GPIO7 3.3V/5V MAIN O
I/O/OD
S/PDIF Transmitter Output
General Purpose Input/Output 7 :
Refer to GPIO description.
Fast Ethernet and Homenetworking interface
Name Tolerance Power
Plane
Type
Attr
Description
EECS 3.3V AUX O Serial EEPROM Chip Select : This enables the EEPROM during loading of
the Ethernet configuration data.
EEDI 3.3V AUX O Serial EEPROM Data Input : During serial EEPROM access cycle, the
SiS630 will use this pin to serially write OP codes, addresses and data into the
serial EEPROM.
EEDO
GPIO3 3.3V/5V AUX I
I/O/OD
Serial EEPROM Data Output : During serial EEPROM access cycle, the
SiS630 will read the contents of the EEPROM serially through this pin.
Requires external pull-up resistor.
General Purpose Input/Output 3 : Refer to GPIO description.
EESK 3.3V AUX O Serial EEPROM Clock : This pin provides the clock for the serial EEPROM.
OSC25MHI 3.3V AUX I PHY 25MHz Clock Input : This pin is supplied the 25MHz clock signal input
from the external crystal or an oscillator.
PLEDO#
OC3#
GPIO8 3.3V AUX OD
O
I/O/OD
Programmable LED Output :
(A)Select 10/100Mbps LAN Mode: This pin is used as an LINK/ACTIVITY
indication output.
(B)Select Home Networking Mode: This pin is also an LINK/ACTIVITY
indication output.
OC3# : When this pin is configured as OC3#, it can
detects USB Port 3 over current condition.
General Purpose Input/Output 8 : Refer to GPIO description.
REXT AUX I Transmit Current Set : An external resistor connected between this pin and
GND will set the output current level for the twisted pair outputs.
TPIP AUX I Twisted Pair Receive Positive Input
TPIN AUX I Twisted Pair Receive Negative Input
TPOP AUX O Twisted Pair Transmit Positive Output
TPON AUX O Twisted Pair Transmit Negative Output
HRTXRXP AUX I/O Twisted Pair Transmit / Receive Positive Data
HRTXRXN AUX I/O Twisted Pair Transmit / Receive Negative Data