PRIXP420ABB 885158 Intel, PRIXP420ABB 885158 Datasheet - Page 47

• Manufacturer Part Number: PRIXP420ABB 885158
• Manufacturer: Intel

Specifications of PRIXP420ABB 885158

• Lead Free Status / Rohs Status: Compliant

General Hardware Design Considerations—Intel
plane processors
3.10.2
Figure 15.
3.10.3
December 2007
Document Number: 252817-008US
PCI Interface Block Diagram
PCI Interface
When one of the IXP42X product line and IXC1100 control plane processors is host, it
may interface to four PCI slots at 33 MHz or two PCI slots at 66 MHz. The limitation to
two slots at 66 MHz is due to load requirements to maintain signal integrity at the
higher frequency.
The PCI-to-PCI bridge must be used in order to address the PCI requirement that no
more than one load may be placed on the CompactPCI connector unless it is through a
PCI-to-PCI bridge. The IDSEL signals on the PCI slots can be connected onto the
PCI_AD bus.
Design Notes
• The processors do not support a 5-V PCI signal interface. They support 3.3-V signal
• The PCI Local Bus Specification, Rev. 2.2 requires that the bus is always “parked.”
• The processors’ GPIO pins can be used by PCI devices on PCI slots to request an
• PCI_INTA_N is an open-drain signal and is used to request an interrupt from an
interfaces only.
Some device is always driving the AD lines so there should NOT be any pull-ups on
these signals. The specification states that the following control lines should be
pulled up: FRAME#, TRDY#, IRDY#, DEVSEL#, STOP#, SERR#, PERR#, LOCK#,
INTA#, INTB#, INTC#, and INTD#.
interrupt from the processors’ PCI controller.
external PCI host if the processors implements PCI in option mode.
IXP42X Product Line
and IXC1100 Control
Plane Processors
Intel
®
Intel
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
®
IXP42X product line and IXC1100 control
PCI BUS
PCI Slots
Hardware Design Guidelines
B2260 -02
47