MiTAC 7521 PLUS/N User Manual
96
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
USB interface
Name
Tolerance Power
Plane
Type
Attr
Description
CLK48M
3.3V/5V
MAIN
I
USB 48 MHz clock input : This signal provides
the fundamental clock for the USB Controller.
the fundamental clock for the USB Controller.
OC0#
PCIREQ3#
GPIO0
PCIREQ3#
GPIO0
3.3V/5V
MAIN
I
I
I
I/O/OD
USB Port 0 Over Current Detection : OC0# is
used to detect the over current condition of USB
Port 0.
External PCI Master Request 3: PCIREQ3# is
used for PCI Device on PCI Slot 3 to assert its
request to hold PCI Bus.
General Purpose Input/Output 0 : Refer to GPIO
description.
used to detect the over current condition of USB
Port 0.
External PCI Master Request 3: PCIREQ3# is
used for PCI Device on PCI Slot 3 to assert its
request to hold PCI Bus.
General Purpose Input/Output 0 : Refer to GPIO
description.
OC1#
PCIGNT3#
GPIO1
PCIGNT3#
GPIO1
3.3V/5V
MAIN
I
O
I/O/OD
USB Port 1 Over Current Detection : OC1# is
used to detect the over current condition of USB
Port 1.
External PCI Master Grant 3 : PCIGNT3# is
used to indicate PCI Device on PCI Slot 3 the PCI
Bus has been granted.
General Purpose Input/Output 1 : Refer to GPIO
description.
used to detect the over current condition of USB
Port 1.
External PCI Master Grant 3 : PCIGNT3# is
used to indicate PCI Device on PCI Slot 3 the PCI
Bus has been granted.
General Purpose Input/Output 1 : Refer to GPIO
description.
OC3#
LDRQ1#
GPIO2
LDRQ1#
GPIO2
3.3V/5V
MAIN
I
I
I
I/O/OD
USB Port 3 Over Current Detection: OC3# is
used to detect the over current condition of USB
Port 3.
LPC DMA Request 1 : LDRQ1# is the second
LPC DMA request signal used by LPC Device to
request DMA cycles.
General Purpose Input/Output 2 : Refer to GPIO
description.
used to detect the over current condition of USB
Port 3.
LPC DMA Request 1 : LDRQ1# is the second
LPC DMA request signal used by LPC Device to
request DMA cycles.
General Purpose Input/Output 2 : Refer to GPIO
description.
USBP[4:0]P
3.3V
AUX
I/O
USB Port [4:0] Positive Input/Output
USBP[4:0]N
3.3V
AUX
I/O
USB Port [4:0] Negative Input/Output
Power and Ground Signals
Name
Tolerance
Power
Plane
Type
Attr
Description
VSS
GROUND
0V
IVDD
MAIN
1.8V
IVDD (AUX)
AUX
1.8V
OVDD
(AUX)
(AUX)
AUX
3.3V
USBVDD
AUX
3.3V
RTCVDD
RTC
1.8V
DCLKAVDD
MAIN
3.3V
ECLKAVDD
MAIN
3.3V
TXAVDD
AUX
3.3V
RXAVDD
AUX
3.3V
DACAVDD
MAIN
3.3V
IDEAVDD
MAIN
1.8V
SDAVDD
MAIN
3.3V
CPUAVDD
MAIN
3.3V
VTTB
MAIN
1.5V
VSSQ
GROUND
0V
VTTA
MAIN
1.5V
VCC3
MAIN
3.3V
Legacy I/o and Miscellaneous Signals
Name
Tolerance Power
Plane
Type
Attr
Description
SPK
3.3V
MAIN
O
Speaker output : The SPK is connected to the
system speaker.
system speaker.