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IMBA-X9654 ATX Motherboard
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Figure 2-8: USB Connector
2.6 Intel® ICH8DO PCIe Bus Components
2.6.1 PCIe Bus Overview
The IMBA-X6954 Intel® ICH8DO southbridge PCIe bus is split into two PCIe x1 channels
and one PCIe x4 channel. The two PCIe x1 channels are each connected to a Broadcom
PCIe GbE controller. The PCIe x4 channel is connected to a PLX PEX8518 PCIe switch
which is connected in turn to three PCIe x4 slots.
2.6.2 PCIe x4 Interface Goldfinger
The PCIe x4 from the southbridge consists of four lanes. The four lanes are connected to
a PLX PEX8518 PCIe switch, which is then connected to three PCIe x4 expansion slots as
shown in Figure 2-9 .