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Intel
®
IQ31244 Customer Reference Board
14 User’s Manual
2.0 PCI-X Interface
The IQ31244 contains two 64-bit PCI-X buses. The primary PCI bus, clocked at up to 100 MHz,
interfaces with the Intel
®
80321 I/O Processor, the Intel
®
82546 Dual-Port Gigabit Ethernet
Controller, the Intel
®
31154 133 MHz PCI Bridge, and the PCI-X expansion slot.
Note: The PCI-X expansion slot must be used for PCI-X cards only.
The secondary PCI bus, clocked at 100 MHz, provides the interface between the Intel
®
31154
133 MHz PCI Bridge and the four Intel
®
31244 PCI-X to Serial ATA Controllers.
In addition, the two buses can communicate with each other by means of the Intel® FW31154
133 MHz PCI-X Bridge. The primary bus and secondary bus can operate at different speeds and
modes independently of each other. Depending on the peripheral add-in card capability, the
primary bus can operate at either conventional PCI, PCI-X 66 MHz, or PCI-X 100 MHz. The mode
of the IQ31244 primary bus can also be set by jumpers Z3 and Z4, as shown in Table 6.
Table 6. Primary PCI Bus
Type of PCI Speed Z4 Z3
PCI-X 100 100 MHz Open Open
PCI-X 66 66 MHz Open Closed
Conventional PCI 66 MHz Closed Open