EP80579 Datasheet, PDF (1745/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
Table 48-11. General-Purpose IO Signals (Sheet 2 of 5)
Signal Name
GPIO[9]
GPIO[10]
GPIO[12]
GPIO[13]
GPIO[14]
GPIO[15]
GP16_IRQ24
GP17_IRQ25
IO Type
LVTTL,3.3V
LVTTL,3.3V
LVTTL,3.3V
LVTTL,3.3V
LVTTL,3.3V
LVTTL,3.3V
LVTTL,3.3V
LVTTL,3.3V
Direction
Ball
Count
External
Pull-Up/
Down
[Ohms]
BSC/
XOR
Signal Description Normal/Alternate Mode
I
1
BSC
General Purpose IO 9: Resides in the Suspend
power well.
I
1
BSC
General Purpose IO 10: Resides in the Suspend
power well.
I
1
BSC
General Purpose IO 12: Resides in the Core
power well.
I
1
BSC
General Purpose IO 13: Resides in the Core
power well.
I
1
BSC
General Purpose IO 14: Resides in the Suspend
power well.
I
1
BSC
General Purpose IO 15: Resides in the Suspend
power well.
General Purpose IO 16: This signal can function
as either GPIO[16] or IRQ[24]. Resides in the
Core power well.
Note: Internal pullup is always enabled (50K
nominal).
I/O
1
No pullup
required in BSC
IRQ mode
A16 Override Strap: This strap selects the
treatment of A16 for cycles going to BIOS space
(but not feature space) in the FWH.
The EP80579 interprets this strap as follows:
0 = IICH does not invert A16.
1 = IICH inverts A16 on some BIOS cycles
(default)
General Purpose IO 17: This signal can function
as either GPIO[17] or IRQ[25]. Resides in the
Core power well.
Note: Internal pullup is always enabled (50K
nominal).
Boot BIOS Selection Strap: This strap selects
the source of the BIOS during boot.
No pullup
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
GP18_IRQ36
LVTTL,3.3V I/O
Note: Intel recommends using the SPI for
Pre-boot firmware due to the reduced
availability of LPC FWH.
General Purpose IO 18: This signal can function
as either GPIO[18] or IRQ[36]. Resides in the
Core power well.
No pullup
Notes:
1
required in BSC
IRQ mode
• Internal pullup is always enabled (50K
nominal).
• Do not drive this signal low until the
CPURST# signal is de-asserted.
August 2009
Order Number: 320066-003US
Intel^® EP80579 Integrated Processor Product Line Datasheet
1745