MiTAC 8224, Service Manual

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8224 N/B Maintenance
8224 N/B Maintenance
94
5.2 Intel ICH7-M South Bridge (5)
USB Interface Signals
Name Type Description
USBP0P,
USBP0N,
USBP1P,
USBP1N
I/O
Universal Serial Bus Port [1:0] Differential:
These differential pairs are used to transmit Data/Address/Command
signals for ports 0 and 1. These ports can be routed to UHCI
controller #1 or the EHCI controller.
NOTE: No external resistors are required on these signals. The Intel
®
ICH7 integrates 15 k
Ω
pull-downs and provides an output driver
impedance of 45
Ω
which requires no external series resistor.
USBP2P,
USBP2N,
USBP3P,
USBP3N
I/O
Universal Serial Bus Port [3:2] Differential:
These differential pairs are used to transmit data/address/command
signals for ports 2 and 3. These ports can be routed to UHCI
controller #2 or the EHCI controller.
NOTE: No external resistors are required on these signals. The ICH7
integrates 15 K
Ω
?pull-downs and provides an output driver
impedance of 45
Ω
which requires no external series resistor.
USBP4P,
USBP4N,
USBP5P,
USBP5N I/O Universal Serial Bus Port [5:4] Differential:
These differential pairs are used to transmit Data/Address/Command
signals for ports 4 and 5. These ports can be routed to UHCI
controller #3 or the EHCI controller.
NOTE: No external resistors are required on these signals. The ICH7
integrates 15 K
Ω
? pull-downs and provides an output driver
impedance of 45
Ω
which requires no external series resistor.
USBP6P,
USBP6N,
USBP7P,
USBP7N I/O Universal Serial Bus Port [7:6] Differential:
These differential pairs are used to transmit Data/Address/Command
signals for ports 6 and 7. These ports can be routed to UHCI
controller #4 or the EHCI controller.
NOTE: No external resistors are required on these signals. The ICH7
integrates 15 K
Ω
? pull-downs and provides an output driver
impedance of 45
Ω
which requires no external series resistor.
OC[4:0]#
OC5#/
GPIO29
OC6#/ GPIO30
OC7#/ GPIO31
I Overcurrent Indicators:
These signals set corresponding bits in the USB controllers to indicate
that an overcurrent condition has occurred.
OC[7:4]# may optionally be used as GPIOs.
NOTE: OC[7:0]# are not 5 V tolerant.
USBRBIAS O USB Resistor Bias:
Analog connection point for an external resistor. Used to set transmit
currents and internal load resistors.
USBRBIAS# I USB Resistor Bias Complement:
Analog connection point for an external resistor. Used to set transmit
currents and internal load resistors.
EEPROM Interface Signals
Name Type Description
EE_SHCLK
O
EEPROM Shift Clock:
Serial shift clock output to the EEPROM.
EE_DIN I EEPROM Data In:
Transfers data from the EEPROM to the Intel
®
ICH7. This signal
has an integrated pull-up resistor.
EE_DOUT O EEPROM Data Out:
Transfers data from the ICH7 to the EEPROM.
EE_CS O EEPROM Chip Select:
Chip select signal to the EEPROM.
Interrupt Signals
Name Type Description
SERIRQ I/O Serial Interrupt Request:
This pin implements the serial interrupt protocol.
PIRQ[D:A]# I/OD PCI Interrupt Requests:
In non-APIC mode the PIRQx# signals can be routed to interrupts 3,
4, 5, 6, 7, 9, 10, 11, 12, 14 or 15 as described in the Interrupt Steering
section. Each PIRQx# line has a separate Route Control register.
In APIC mode, these signals are connected to the internal I/O APIC in
the following fashion: PIRQA# is connected to IRQ16, PIRQB# to
IRQ17, PIRQC# to IRQ18, and PIRQD# to IRQ19. This frees the
legacy interrupts.
PIRQ[H:E]# /
GPIO[5:2]
I/OD PCI Interrupt Requests:
In non-APIC mode the PIRQx# signals can be routed to interrupts 3,
4, 5, 6, 7, 9, 10, 11, 12, 14 or 15 as described in the
Interrupt Steering
section. Each PIRQx# line has a separate Route Control register.
In APIC mode, these signals are connected to the internal I/O APIC in
the following fashion: PIRQE# is connected to IRQ20, PIRQF# to
IRQ21, PIRQG# to IRQ22, and PIRQH# to IRQ23. This frees the
legacy interrupts. If not needed for interrupts,
these signals can be used as GPIO.
IDEIRQ I IDE Interrupt Request:
This interrupt input is connected to the IDE drive.
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