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