Pci Pullup Resistors Not Required; Pci-X Signals; Pci/Pci-X Frequency/Mode Straps - Intel 41210 Design Manual

PCI-X Layout Guidelines
Table 6.

PCI-X Signals

Timing Critical Signals
Reset Signals
Non Timing Critical
Table 7.

PCI/PCI-X Frequency/Mode Straps

A_PCIXCAP, B_PCIXCAP
PCI-X 66MHz cards connect this
signal to ground through a 10K
±5% resistor in parallel with a
0.01uF ±10% capacitor.
PCI-X 133 MHz cards connect
PCIXCAP to ground through a
0.01uF ±10% capacitor.
PCI-X 133 MHz cards connect
PCIXCAP to ground through a
0.01uF ±10% capacitor.
Note: All signals sampled on the rising edge of PERST#.
8.3.1

PCI Pullup Resistors Not Required

PCI control signals on the 41210 Bridge do NOT require pullup resistors on the adapter card to
ensure that they contain stable values when no agent is actively driving the bus. These include:
A_ACK64#, A_AD[63:32], A_CBE#[7:4], A_DEVSEL#, A_FRAME#, A_INTA#, A_INTB#,
A_INTC#, A_INTD#, A_IRDY#, A_PERR#, A_PAR, A_GNT#[5:0], A_REQ#[5:0], A_LOCK#,
A_PAR64, A_REQ64#, A_SERR#, A_STOP#, A_TRDY#, B_ACK64#, B_AD[63:32],
34
A PCI Bus Segment:
A_ACK64#, A_AD[63:0], A_CBE_[7:0]#, A_DEVSEL#, A_FRAME#,
A_GNT_[5:0]#, A_IRDY#, A_LOCK#, A_PAR64, A_REQ64#, A_REQ_[5:0]#,
A_STOP#, A_TRDY#, A_CLKO[6:0], A_CLKI
B PCI Bus Segment:
B_ACK64#, B_AD[63:0], B_CBE_[7:0]#, B_DEVSEL#, B_FRAME#,
B_GNT_[5:0]#, B_IRDY#, B_LOCK#, B_PAR64, B_REQ64#, B_REQ_[5:0]#,
B_STOP#,B_TRDY#, B_CLKO[6:0], B_CLKI
A PCI Bus Segment:
A_RST#, A_PME#
B PCI Bus Segment:
B_RST#, B_PME#
A PCI Bus Segment:
A_133EN, A_IRQ[15:0]#, A_M66EN, A_PCIXCAP, A_PERR#, A_SERR#
Signals
B PCI Bus Segment:
B_133EN, B_IRQ[15:0]#, B_M66EN, B_PCIXCAP, B_PERR#, B_SERR#
0
0
A_M66EN, A_133EN,
B_M66EN B_133EN
(on board)
0 X
1 X
X X
X 0
X 1
Intel® 41210 Serial to Parallel PCI Bridge Design Guide
Bus
Mode/
Freq
PCI 33
PCI 66
PCI-X 66
PCI-X 100
PCI-X 133