General Purpose I/O (Gpio) And Interrupt Interface; Gpio Signals; Gpio Pin Definitions - Intel EP80579 Manual

Intel
17.0 General Purpose I/O (GPIO) and Interrupt
Interface
17.1

GPIO Signals

The EP80579 provides 36 general-purpose input/output (GPIO) pins for use in
generating and capturing application-specific input and output signals. By design, each
GPIO pin is hard-wired as input (GPI), output (GPO), or input/output (GPIO). Only the
Input/Output (GPIO) pins can be re-programmed as an input or output. Some of the
GPIO signals are multiplexed and can be reconfigured to provide alternate functionality,
such as IOAPIC interrupts. All GPIO pins which are configured as IRQ inputs do not
require any external pull-up resistors. Additionally, SIU_TXD2 (UART_TXD2) should be
pulled-down with a 510 ohm resistor to enable the configuration of the GPIOs to
function as IOAPIC Interrupts. When a GPIO pin is configured as an IOAPIC IRQ, the
pin direction is automatically set as an input (I).
definitions for the GPIO pins,
Development Board and
pins.
Table 75. GPIO Pin Definitions (Sheet 1 of 2)
Signal(s)
GPIO[1:0]
GP2_PIRQE#
GP3_PIRQF#
GP4_PIRQG#
GP5_PIRQH#
GPIO[10:6]
GP11_SMBALERT#
GPIO[15:12]
GPIO[16]
GPIO[17]
GPIO[18]
GPIO[19]
GPIO[20]
GPIO[21]
GPIO[23]
GPIO[24]
GPIO[25]
GP26_SATA0GP
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Intel EP80579 Integrated Processor Product Line
Platform Design Guide
202
®
EP80579 Integrated Processor Product Line—General Purpose I/O (GPIO) and Interrupt
Table 76
Table 77
I/O Type
(Default
Mode)
I
I
I
I
I
I
I
I
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I
Table 75
shows how the GPIOs are used in the
shows how the GPIOs are used as external interrupt
Function
Alternate
(Default
Mode
Mode)
GPI N/A
GPI PIRQE#
GPI PIRQF#
GPI PIRQG#
GPI PIRQH#
GPI N/A
SMBALERT# GPIO[11]
GPI N/A
GPIO IRQ24
GPIO IRQ25
GPIO IRQ36
GPIO IRQ37
GPIO IRQ26
GPIO IRQ27
GPIO IRQ28
GPIO IRQ29
GPIO IRQ38
GPI SATA0GP
Interface
provides the functional
Description
Unmultiplexed
GPIO[2] multiplexed with PIRQE#
GPIO[3] multiplexed with PIRQF#
GPIO[4] multiplexed with PIRQG#
GPIO[5] multiplexed with PIRQH#
Unmultiplexed
SMBALERT# multiplexed with
GPIO[11]
Unmultiplexed
Multiplexed with IOAPIC IRQ24
Multiplexed with IOAPIC IRQ25
Multiplexed with IOAPIC IRQ36
Multiplexed with IOAPIC IRQ37
Multiplexed with IOAPIC IRQ26
Multiplexed with IOAPIC IRQ27
Multiplexed with IOAPIC IRQ28
Multiplexed with IOAPIC IRQ29
Multiplexed with IOAPIC IRQ38
Multiplexed with SATA0GP
May 2010
Order Number: 320068-005US