Global American 2807940, User Manual

Page: 42 / 170

2807940 uATX Motherboard
Page 26
2.5.11.2 2807940 USB Implementation
All twelve of the Intel® ICH9DO USB ports are implemented on the 2807940. Four USB
ports (USB Port 1 to USB Port 4) are connected to four external connectors and eight USB
ports (USB Port 5 to USB Port 12) are connected to four 8-pin onboard pin-headers. See
Figure 2-11 .
Figure 2-11: Onboard USB Implementation
2.6 2807940 PCIe Bus Components
2.6.1 PCIe Bus Overview
The 2807940 has one PCIe x16 channel from the Intel® Q35 Northbridge and six PCIe x1
lanes from the Intel® ICH9DO Southbridge. The PCIe bus lanes are interfaced to the
following devices.
„ One PCIe x16 lane is connected to one PCIe x16 graphics card
„ Four PCIe x1 lanes are connected to one PCIe x4 expansion card
„ One PCIe x1 lane are connected to one Intel® PCIe GbE device
„ One PCIe x1 is shared with the Intel® ICH9DO Gigabit LAN Connect
Interface (GLCI), which is connected to a Intel® 82566DM Gigabit platform
LAN connect device