Introduction
1.2
Intel® 6702PXH 64-bit PCI Hub Overview
1.2.1
PCI Express Interface (Primary Bus)
The primary bus interface between the Intel® 6702PXH 64-bit PCI Hub and the core logic chipset
component is the PCI Express interface. Maximum realized bandwidth on this interface is 2 GB/s
in each direction simultaneously, for an aggregate of 4 GB/s. The PCI Express interface is
compatible with the PCI Express Base Specification, Revision 1.0a. The Intel® 6702PXH 64-bit
PCI Hub supports X1, X4, and X8 widths for PCI Express. X4 width is supported on 3:0 (with
3 being lane 3) and 4:7 (with 4 being lane 3), and X1 width is supported on lanes 7, 4, 3, and 0. The
Intel® 6702PXH 64-bit PCI Hub also supports X8 lane reversal, plus X4 lane reversal on the lower
4 lanes only.
1.2.2
PCI/PCI-X Bus Interfaces (Secondary Bus)
The Intel® 6702PXH 64-bit PCI Hub has a single PCI Bus interface (PCI Bus A). 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® 6702PXH 64-bit PCI Hub support
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® 6702PXH 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® 6702PXH 64-bit PCI Hub supports PCI bus frequencies of 33 MHz and 66 MHz.
For the PCI-X Mode 1, the Intel® 6702PXH 64-bit PCI Hub supports PCI bus frequencies of
66 MHz, 100 MHz, and 133 MHz.
1.2.3
PCI Standard Hot Plug Controller
The Intel® 6702PXH 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® 6702PXH 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® 6702PXH 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® 6702PXH 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.
12
Intel® 6702PXH 64-bit PCI Hub Datasheet
INTEL [ INTEL ]
