Intel IQ31244 User Manual
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
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
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.
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