Intel EP80579 Guide

Intel
®
EP80579 Integrated Processor Product Line—General Purpose I/O (GPIO) and Interrupt
Interface
Intel
®
EP80579 Integrated Processor Product Line
Platform Design Guide May 2010
202 Order Number: 320068-005US
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). Table 75 provides the functional
definitions for the GPIO pins, Table 76 shows how the GPIOs are used in the
Development Board and Table 77 shows how the GPIOs are used as external interrupt
pins.
Table 75. GPIO Pin Definitions (Sheet 1 of 2)
Signal(s)
I/O Type
(Default
Mode)
Function
(Default
Mode)
Alternate
Mode
Description
GPIO[1:0] I GPI N/A Unmultiplexed
GP2_PIRQE# I GPI PIRQE# GPIO[2] multiplexed with PIRQE#
GP3_PIRQF# I GPI PIRQF# GPIO[3] multiplexed with PIRQF#
GP4_PIRQG# I GPI PIRQG# GPIO[4] multiplexed with PIRQG#
GP5_PIRQH# I GPI PIRQH# GPIO[5] multiplexed with PIRQH#
GPIO[10:6] I GPI N/A Unmultiplexed
GP11_SMBALERT# I SMBALERT# GPIO[11]
SMBALERT# multiplexed with
GPIO[11]
GPIO[15:12] I GPI N/A Unmultiplexed
GPIO[16] I/O GPIO IRQ24 Multiplexed with IOAPIC IRQ24
GPIO[17] I/O GPIO IRQ25 Multiplexed with IOAPIC IRQ25
GPIO[18] I/O GPIO IRQ36 Multiplexed with IOAPIC IRQ36
GPIO[19] I/O GPIO IRQ37 Multiplexed with IOAPIC IRQ37
GPIO[20] I/O GPIO IRQ26 Multiplexed with IOAPIC IRQ26
GPIO[21] I/O GPIO IRQ27 Multiplexed with IOAPIC IRQ27
GPIO[23] I/O GPIO IRQ28 Multiplexed with IOAPIC IRQ28
GPIO[24] I/O GPIO IRQ29 Multiplexed with IOAPIC IRQ29
GPIO[25] I/O GPIO IRQ38 Multiplexed with IOAPIC IRQ38
GP26_SATA0GP I GPI SATA0GP Multiplexed with SATA0GP

Intel EP80579 Specifications

General

Brand	Intel
Model	EP80579
Category	Computer Hardware
Language	English