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3.10.2
PCIX Initialization Summary
Figure 16
secondary side of the PCI-X bridge. The 80219, GbE device, and the PCI-X expansion slot all reside
on this bus.
Figure 16.
PCI-X Routing Diagram on Secondary PCI-X Bridge
Switch
S8E1-4
Sel 100
PCI-X
Bridge
3.10.2.1
User Defined Switches
User can set the PCIXCAP signal to force one of the following modes:
•
PCI-X 100/133
The IQ80219 platform is by default set to operate this bus in PCI-X 66 MHz mode. The loading on
the secondary PCI-X bus may result in marginal operation when speed is greater than that.
When an expansion card is placed on the PCI-X expansion slot, the mode is based on the least
capable device on the bus. For example, when the bus is forced to be PCI-X 66 capable and then
places a PCI 66 card in the expansion slot, then the bus is configured as PCI 66.
Important: The clock selection is manually configured. Pay close attention to setting this up correctly.
Important: All settings must be done prior to power-up/reset.
3.10.2.2
PCI-X Bridge Initialization Signals
The On-board PCI-X bridge samples the PCIXCAP, SEL100, and M66EN signals to drive/indicate the
correct mode to the secondary bus devices. The 80219 uses these signals to set its internal PLs,
providing correct frequency to the Intel XScale
Board Manual
Intel® IQ80219 General Purpose PCI Processor Evaluation Platform
shows a routing guidance on how PCI-X mode is determined/implemented on the
Switch
Switch
S7E1-8
S7E1-6
S7E1-7
Enable
Selection
Clock
Multiplier/Buffer
PCI-X Clock
PCIXCAP
M66EN Signal
S_DEVSEL
S_FRAME
S_IRDY
S_STOP
S_TRDY
Switch
Switch
S8E2-1
S8E2-2
S8E2-4
PCIXCAP
M66EN
OSC
r
•
PCI-X 66
®
core, as well as internal, peripheral, and DDR buses.
Hardware Reference Section
SPCI-X Slot
®
Intel
80219
General
Purpose
PCI
Processor
82544
Gigabit Ethernet
•
PCI
B2840-01
53
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