Introduction
1.2.2
PCI/PCI-X Bus Interfaces (Secondary Bus)
The Intel® 6700PXH 64-bit PCI Hub has two PCI Bus interfaces (PCI Bus A and PCI Bus B). In
this document these buses are referred to as the secondary buses. These interfaces can be
independently configured as either a PCI Bus or PCI-X Bus. The Intel® 6700PXH 64-bit PCI Hub
supports conventional PCI and PCI-X Mode 1. PCI Bus extensions are also supported; these
include 64-bit addressing outbound, with the capability to assert DAC, and full 64-bit addressing
inbound. The inbound packet size is based on cache line size of the platform.
The PCI Bus interface is compliant with the PCI Local Bus Specification Revision 2.3. The PCI-X
interface on the Intel® 6700PXH 64-bit PCI Hub is compliant with the PCI-X Addendum to the
PCI Local Bus Specification Revision 1.0b as well as the Mode 1 section of the PCI-X Electrical
and Mechanical Addendum to the PCI Local Bus Specification Revision 2.0a and the PCI-X
Protocol Addendum to the PCI Local Bus Specification Revision 2.0a. For conventional PCI Mode,
the Intel® 6700PXH 64-bit PCI Hub supports PCI bus frequencies of 33 MHz and 66 MHz. For
the PCI-X Mode 1, the Intel® 6700PXH 64-bit PCI Hub supports PCI bus frequencies of 66 MHz,
100 MHz, and 133 MHz. Four PCI-X bus slots are supported at 66 MHz, two slots are supported at
100 MHz, and one slot is supported at 133 MHz.
1.2.3
PCI Standard Hot Plug Controller
The Intel® 6700PXH 64-bit PCI Hub hot plug controller is compliant with PCI Standard-Hot Plug
Controller and Subsystem Specification, Revision 1.0 and allows PCI card removal, replacement,
and addition without powering down the system. The Intel® 6700PXH 64-bit PCI Hub hot plug
controller supports three to six PCI slots through an input/output serial interface when operating in
Serial Mode, and one to two slots through an input/output parallel interface when operating in
Parallel Mode. The Intel® 6700PXH 64-bit PCI Hub can also operate in “one-slot-no-glue” hot
plug mode, which does not require and on-board logic for enabling and disabling the bus and
clocks signals to the PCI/PCI-X hot plug slots. The input serial interface is polling and is in
continuous operation. The output serial interface is “demand” and acts only when requested. These
serial interfaces run at about 8.25 MHz regardless of the speed of the PCI bus. In parallel mode, the
Intel® 6700PXH 64-bit PCI Hub performs the serial to parallel conversion internally, so the serial
interface cannot be observed. However, internally the hot plug controller always operates in a serial
mode.
1.2.4
1.2.5
I/OxAPIC Controller
The Intel® 6700PXH 64-bit PCI Hub contains two I/OxAPIC controllers, both of which reside on
the primary bus. The intended use of these controllers for the Intel® 6700PXH 64-bit PCI Hub is to
have the interrupts from PCI bus A connected to the interrupt controller on device 0, function 1 and
have the interrupts on PCI bus B connected to the interrupt controller on device 0, function 3.
SMBus Interface
The SMBus interface can be used for system and power management related tasks. The interface is
compliant with System Management Bus Specification Revision 2.0. The SMBus interface allows
full read/write access to all configuration and memory spaces in the Intel® 6700PXH 64-bit PCI
Hub.
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Intel® 6700PXH 64-bit PCI Hub Datasheet
INTEL [ INTEL ]
