FW82801E Intel, FW82801E Datasheet - Page 48

• Manufacturer Part Number: FW82801E
• Description: Communications I/O Controller Hub
• Manufacturer: Intel

Intel
3.2.20
48
Table 25. General Purpose I/O Signals (Sheet 2 of 2)
Table 26. Power and Ground Signals
®
82801E C-ICH
Power and Ground
GPIO[20:18]
GPIO[17:16]
GPIO[15:14]
GPIO[13:12]
GPIO[10:9]
GPIO[5:4]
GPIO[3:2]
GPIO[1:0]
V_CPU_IO
GPIO[21]
GPIO[11]
HUBREF
GPIO[8]
GPIO[7]
GPIO[6]
VccRTC
Vcc1_8
Vcc3_3
V5REF
Name
VBIAS
Name
Vss
0.9 V reference for the hub interface.
Reference for 5 V tolerance on Core well inputs.
RTC well bias voltage. The DC reference voltage applied to this pin sets a current that is
mirrored throughout the oscillator and buffer circuitry. See “External RTC Circuitry” on
page 50.
1.8 V supply for Core well logic.
3.3 V supply for Core well I/O buffers.
3.3 V (can drop to 2.0 V min. in G3 state) supply for the RTC well. This power is not
expected to be shut off unless the RTC battery is removed or completely drained.
NOTE: Implementations should not attempt to clear CMOS by using a jumper to pull
Powered by the same supply as the processor I/O voltage. This supply is used to drive the
processor interface outputs.
Ground.
Type
O
O
O
I
I
I
I
I
I
I
I
I
VccRTC low. Clearing CMOS in an 82801E C-ICH-based platform can be done
by using a jumper on RTCRST# or GPI, or using SAFEMODE strap.
Fixed as Output only. Main power well.
Fixed as Output only. Main power well.
Fixed as Output only. Main Power Well. Can instead be used for PC/PCI
GNT[A:B]#. GPIO[17] can also alternatively be used for PCI GNT[5]#. Integrated
pull-up resistor.
Not implemented.
Fixed as Input only. Main Power Well. Not muxed.
Fixed as Input only. Main Power Well. Can instead be used for SMBALERT#.
Not implemented.
Fixed as Input only. Main Power Well. Not muxed.
Fixed as Input only. Main power well. Not muxed.
Fixed as Input only. Main power well.
Fixed as Input only. Main power well. Can be used instead as PIRQ[G:H]#.
Reserved.
Fixed as Input only. Main Power Well. Can instead be used for PC/PCI
REQ[A:B]#. GPIO[1] can also alternatively be used for PCI REQ[5]#.
Description
Description
Advance Information Datasheet