Pci-X Two Devices Down-Routing Requirements; Device Down After Pci-X Riser Card Topology; Device Down With Stub Before Pci-X Riser Card Topology - Intel Pentium M Processor Design Manual

® ®
Intel Pentium M Processor and Intel
®
Intel 82870P2 (Intel P64H2)
Figure 87.

Device Down After PCI-X Riser Card Topology

Table 67. Device Down After PCI-X Riser Card Length Requirements
Configuration
PCI-X 100 MHz, 1 slot riser
PCI-X 66 MHz, 3 slot riser
Figure 88
to riser leg, close to the riser itself. This topology may only be run at PCI 66 MHz or below.
Figure 88.

Device Down with Stub Before PCI-X Riser Card Topology

Table 68. Device Down with Stub Before PCI-X Riser Card Length Requirements
Configuration
PCI-X 66 MHz, 3 slot riser
8.1.5

PCI-X Two Devices Down-Routing Requirements

The following guideline is for a system that uses two devices down on a single PCI-X channel. A
good example of usage for this configuration is an I/O Processor or RAID device and a SCSI
controller. This channel may be run at PCI-X 100 MHz.
128
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E7501 Chipset Platform
®
Intel
P64H2
Intel
Lower
0.0" – 8.0"
1.0" – 6.0"
shows a device down before a PCI-X riser card. Place a 22 Ω series resistor on the stub
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Intel
P64H2
®
Intel P64H2 to Stub
Lower
3.3" – 5.6"
Riser
P64H2 to Riser Riser to Dev ice
®
P64H2 to Riser
Upper
0.0" – 8.0"
1.0"– 4.0"
P64H2 to Stub Stub to Riser
Stub to Dev ice
Dev ice
Stub to Riser
Upper Lower
3.3" – 4.6" 0.2" – 2.3"
Dev ice
Riser to Device
Lower Upper
0.0" – 8.0" 0.0" – 8.0"
1.0" – 4.0" 1.0" – 2.25"
Riser
Stub to Device
Upper Lower
0.2" – 1.3" 1.9" – 6.5" 1.9" – 5.5"
Design Guide
Upper