System Design Checklist
R
Intel
®
815 Chipset Platform Design Guide 161
13.4 ICH Checklist
13.4.1 PCI Checklist
Checklist Items Recommendations
AD[31:0] • AD16,17 pass through 100 Ω resistor.
ACK 64#
REQ 64#
• (5V PCI environment) 2.7 kΩ (approximate) pull-up resistors to VCC5.
• (3V PCI environment) 8.2 kΩ (approximate) pull-up resistors to VCC3_3.
• Each REQ 64# and ACK 64# requires it’s own pull-up.
PTCK • Pull-down through 5.6 kΩ to GND
• Connect to PCI Connectors only.
PTDI, PTRST#, PTMS • Pull-up through 5.6 kΩ resistor to VCC5
• Connect to PCI Connectors only.
PRSNT#21, PRSNT#22,
PRSNT#31, PRSNT#32
• Decoupled with 0.1 µF capacitor to GND
PIRQ#C, PIRQ#D,
U2_ACK64#,
U2_REQ64#,
U3_ACK64#,
U3_REQ64#, PREQ#1,
PLOCK#1, STOP#,
TRDY#, SERR#, PREQ#3,
PIRQ#A, PERR#,
PREQ#0, PREQ#2
DEVSEL#, FRAME#,
IRDY#
• Pull-up through 2.7 kΩ resistor to VCC5
PCIRST# • Pull signal down through 0.1 µF capacitor when input for USB. Input to
buffer for PCIRST_BUF#.
PCPCI_REQ#A,
REQ#B/GPIO1,
GNT#B/GPIO17, PGNT#0,
PGNT#1, PGNT#2,
PGNT#3
• Pull-up through 8.2 kΩ resistor to VCC3_3
PCLK_3 • Signal coming from Intel
®
CK-815 device pass through a 33 Ω resistor to
PCI connector.
PCIRST_BUF# • Signal comes from buffered PCIRST#
• Pull-up through 8.2 kΩ resistor to VCC3_3
• Passes through 33 Ω resistor
SDONEP2, SDONEP3,
SBOP2, SBOP3
• Pull-up through 5.6 kΩ resistor to VCC5
R_RSTP#, R_RSTS# • Signal is from PCIRST_BUF# and passes through a 33 Ω resistor
IDSEL lines to PCI
connectors
• 100 Ω series resistor.
3V_AUX • Optional to 3VSB, but required if PCI devices supporting wake up events.
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