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14.3.3
Digital Video Output Port Checklist
Checklist Items
DVI Input Reference
Circuit
®
14.4
Intel
14.4.1
PCI Interface
Checklist Items
All
PERR#, SERR#
PLOCK#, STOP#
DEVSEL#, TRDY#
IRDY#, FRAME#
REQ[4:0] #, GPIO[1:0],
THRM#
PCIRST#
PCIGNT#
PME#
SERIRQ
GNT[A]#, /GPIO[16],
GNT[B]/ GNT[5]#/
GPIO[17]
14.4.2
Hub Interface
Checklist Items
HL11
HL_COMP
®
Intel
815EG Chipset Platform Design Guide
• See reference schematics in the documentation of the third party vendor of
the device of choice in your design. The Third-Party Vendor information is a
part of this design guide and its associated design guide updates.
ICH2 Checklist
• All inputs to the ICH2 must not be left floating. Many GPIO signals are fixed
inputs that must be pulled up to different sources. See Section 10.1 for
recommendations.
• These signals require a pull-up resistor. Recommend an 8.2 k Ω pull-up
resistor to VCC3.3 or a 2.7 k Ω pull-up resistor to VCC5. See PCI 2.2
Component Specification for pull-up recommendations for VCC3.3 and
VCC5.
• The PCIRST# signal should be buffered to form the IDERST# signal.
• 33 Ω series resistor to IDE connectors.
• No external pull-up resistors are required on PCI GNT signals. However, if
external pull-up resistors are implemented they must be pulled up to
VCC3.3.
• No extra pull-up resistors This signal has an integrated pull-up resistor of
24 k Ω.
• External weak (8.2 k Ω ) pull-up resistor to VCC3.3 is recommended.
• No extra pull-up needed. These signals have integrated pull-ups of 24 k Ω .
• GNT[A] has an added strap function of "top block swap". The signal is
sampled on the rising edge of PWROK. Default value is high or disabled
due to pull-up. A Jumper to a pull-down resistor can be added to manually
enable the function.
• No pull-up resistor required. Use a no-stuff or a test point to put the ICH2
into NAND chain mode testing
• Tie the COMP pin to a 40 Ω 1% or 2% (or 39 Ω 1%) pull-up resistor (to
VCC1.85) via a 10 mil wide, very short (~0.5 inch) trace. ZCOMP No longer
supported.
System Design Checklist
Recommendations
Recommendations
Recommendations
179
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