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
204 Order Number: 320068-005US
17.2 Interrupts
EP80579 provides support for up to four PCI interrupt pins (PIRQ[E:H]) and PCI 2.3
message-based interrupts. EP80579 also maintains support for ISA (legacy)-style
interrupts via the serial interrupt protocol (SERIRQ). PCI Interrupts (PIRQ[A:D]) are
not pinned out on EP80579, but supported via SERIRQ. When IOAPIC is active,
IRQ[39:24] are externally driven interrupts through GPIO pins, enabled if SIU_TXD2 is
pulled low on power-up.
Table 77 shows the mapping of the various interrupts when the IOAPIC is active.
GP18_IRQ36 I T_GPO18_HSS2_INT_N IRQ36 HSS2_INT_N
GP19_IRQ37 I T_GPO19_HSS1_INT_N IRQ37 HSS1_INT_N
GP20_IRQ26 O T_GPO20_SMB_C GPO SMBus_C Enable
GP21_IRQ27 O T_GPO21_SMB_B GPO SMBus_B Enable
GP23_IRQ28 O T_GPO23_SMB_A GPO SMBus_A Enable
GP24_IRQ29 I/O T_GPIO24_FPGA_IO_0 GPIO FPGA_I/O_0
GP25_IRQ38 I/O T_GPIO25_FPGA_IO_1 GPIO FPGA_I/O_1
GP26_SATA0GP I T_GPIO_26_FPGA_IN_11 GPIO FPGA_IN_11
GP27_IRQ39 I/O T_GPIO27_FPGA_IO_2 GPIO FPGA_I/O_2
GP28_IRQ30 I/O T_GPIO28_FPGA_IO_3 GPIO FPGA_I/O_3
GP29_SATA1GP I T_GPIO_29_FPGA_IN_8 GPIO FPGA_IN_8
GP30_IRQ31 I IMCH_SLP_N IRQ31 Sleep signal by External Jumper
GP31_IRQ32 I T_GPI31 GPI Header
GP33_IRQ33 I/O T_GPIO33_FPGA_IO_4 GPIO FPGA_I/O_4/SPI Boot Select
GP34_IRQ34 I/O HPI_GPIO_34 GPIO HSS1 EXT
GP40_IRQ35 I IERR_GPI40 GPI IERR Signal)
LDRQ[1]_N I L_DRQ1_N GPI LPC DMA Request
GPIO[48] O T_GPO_48_FPGA_OUT_5 GPO FPGA_OUT_5
Table 76. Development Board GPIO Usage (Sheet 2 of 2)
Pin Name
I/O
(Default
Mode)
Signal Name
Mode of
Operatio
n
Function
Table 77. Interrupt Configurations - APIC Mode (Sheet 1 of 2)
IRQ #
Interrupt
Name
Source Pin Name
16 PIRQA SERIRQ N/A
17 PIRQB SERIRQ N/A
18 PIRQC SERIRQ N/A
19 PIRQD SERIRQ N/A
20 PIRQE External PIRQE
21 PIRQF External PIRQF
22 PIRQG External PIRQG
23 PIRQH External PIRQH
24 External GPIO[16]

Intel EP80579 Specifications

General

Brand	Intel
Model	EP80579
Category	Computer Hardware
Language	English