EP80579 Datasheet, PDF (1747/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
Table 48-11. General-Purpose IO Signals (Sheet 4 of 5)
Signal Name
GP33_IRQ33
IO Type
LVTTL,3.3V
Direction
Ball
Count
External
Pull-Up/
Down
[Ohms]
BSC/
XOR
Signal Description Normal/Alternate Mode
General Purpose IO 33: This signal can function
as either GPIO[33] or IRQ[33]. Resides in the
Core power well.
Note: Internal pullup is always enabled (50K
nominal).
Boot BIOS Selection Strap: This strap selects
No pullup
the source of the BIOS during boot.
The EP80579 interprets this strap as follows:
I/O
1
required in BSC _{GP17 GP33 Boot Option}
IRQ mode
0
0 Boot BIOS from SPI
0
1 Reserved
1
0 Reserved
1
1 (Default) Boot BIOS from LPC
GP34_IRQ34
GP40_IRQ35
LVTTL,3.3V I/O
LVTTL,3.3V I
GPIO[48]
LVTTL,3.3V O
GP5_PIRQH#
LVTTL,3.3V I
GP4_PIRQG#
LVTTL,3.3V I
GP3_PIRQF#
LVTTL,3.3V I
GP2_PIRQE#
LVTTL,3.3V I
Note: Intel recommends using the SPI for
Pre-boot firmware due to the reduced
availability of LPC FWH.
No pullup
General Purpose IO 34: This signal can function
1
required in BSC as either GPIO[34] or IRQ[34]. Resides in the
IRQ mode
Core power well.
No pullup
General Purpose IO 40: This signal can function
1
required in BSC as either GPIO[40] or IRQ[35]. Resides in the
IRQ mode
Core power well.
General Purpose IO 48: Resides in the Core
power well.
Note: Internal pullup is always enabled (50K
1
BSC
nominal).
The EP80579 interprets this strap as follows:
0 = Reserved
1 = UART/GPIO mode (default).
PCI Interrupt Requests: General purpose or PCI
10K Up (in
interrupt pin. In Non-APIC mode, the
1
PIRQ
BSC GP5_PIRQH# signal is fixed routed to IRQ[23].
mode)
This signal is 5 V tolerant.
PCI Interrupt Requests: General purpose or PCI
10K Up (in
interrupt pin. In Non-APIC mode, the
1
PIRQ
BSC GP4_PIRQG# signal is fixed routed to IRQ[22].
mode)
This signal is 5 V tolerant.
PCI Interrupt Requests: General purpose or PCI
10K Up (in
interrupt pin. In Non-APIC mode, the
1
PIRQ
BSC GP3_PIRQF# signal is fixed routed to IRQ[21].
mode)
This signal is 5 V tolerant.
PCI Interrupt Requests: General purpose or PCI
10K Up (in
interrupt pin. In Non-APIC mode, the
1
PIRQ
BSC GP2_PIRQE# signal is fixed routed to IRQ[20].
mode)
This signal is 5 V tolerant.
August 2009
Order Number: 320066-003US
Intel^® EP80579 Integrated Processor Product Line Datasheet
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