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8.1.2
PCI/PCI-X Routing Requirements (No Hot-Plug Switch)
®
The Intel
bus is shown in
down on the motherboard at the end of the daisy chain.
configurations Intel simulated. These topologies may also be used for Hot-Plug Parallel mode
configurations where a Hot-Plug switch is not used.
Figure 83.
Typical PCI/PCI-X Bus Topology
Intel
P64H2
®
Table 63.
Intel
P64H2 PCI/PCI-X Length Requirements
33 MHz, 5 slots / 1 device down
66 MHz, 4 slots / 0 devices down
100 MHz, 2 slots / 0 devices down
100 MHz, 2 slots / 1 device down
100 MHz, 1 slot / 2 devices down
133 MHz, 1 slot / 0 devices down
133 MHz, 0 slots / 1 devices down
NOTES:
1. During simulation, slot to slot lengths were held constant for some configurations. Therefore, no range may
be given for these length requirements.
2. The 8.25 inches maximum only applies to the signals in the original 32-bit space. The 64-bit extension has
a maximum length of 7.0 inches
8.1.3
PCI/PCI-X Hot-Plug Switch Routing Requirements
®
The Intel
These configurations require the usage of a Hot-Plug switch. The Hot-Plug topology of the bus is
shown in
down on the motherboard at the end of the daisy chain.
configurations that Intel simulated.
Design Guide
®
Intel
Pentium
P64H2 supports a large number of PCI/PCI-X configurations. The basic topology of the
Figure
83. Multiple slots are connected in a daisy chain topology with the device(s)
®
P64H2 to Slot
Configuration
Intel
device
P64H2 supports a large number of PCI/PCI-X Hot-Plug serial mode configurations.
Figure
84. Hot-Plug switches are connected in a daisy chain topology with the device(s)
®
M Processor and Intel
Table 63
Slot 1
Slot
to Slot
®
Intel
P64H2
Slot to Slot
to Slot
2.0" – 7.0"
1.0"
6.0" – 8.0"
1.5"
5.0" – 8.0"
1.0" – 1.75"
3.0" – 3.5"
0.75"
2.0" – 4.0"
(device to device) 5.0"
2
1.0" – 8.25"
N/A
1.25" – 10.0"
®
N/A
P64H2 to
Table 64
®
E7501 Chipset Platform
®
Intel
82870P2 (Intel P64H2)
documents the lengths for the
Slot 2
Slot to
Device Down
1
Slot to Device Down
3.0" – 6.0"
N/A
N/A
2.5" – 3.0"
2.0"
N/A
N/A
documents the lengths for the
Device
Down
125
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