Intel Desktop Board DH77DF Technical Product Specification
26
1.5.3 USB
The PCH contains up to two Enhanced Host Controller Interface (EHCI) host controllers
that support USB high-speed signaling. High-speed USB 2.0 allows data transfers up to
480 Mb/s. All ports are high-speed, full-speed, and low-speed capable.
The PCH also contains an integrated eXtensible Host Controller Interface (xHCI) host
controller which supports USB 3.0 ports. This controller allows data transfers up to
5 Gb/s. The controller supports SuperSpeed (SS), high-speed (HS), full-speed (FS),
and low-speed (LS) traffic on the bus.
The board supports up to four USB 3.0 ports and ten USB 2.0 ports.
The Intel H77 Express Chipset provides the USB controller for the 2.0/3.0 ports. The
port arrangement is as follows:
• Four USB 3.0 ports:
⎯ Two USB 3.0 ports are implemented with stacked back panel connectors (blue)
⎯ Two front panel USB 3.0 ports are implemented through one internal connector
(blue)
• Ten USB 2.0 ports:
⎯ Four ports are implemented with stacked back panel connectors (two black and
two orange high current charging ports)
⎯ Two front panel high current charging ports are implemented through one
internal header (orange)
⎯ Two front panel ports are implemented through one internal header (black)
⎯ Two ports are implemented in the PCI Express Full-/Half–Mini Card slot
NOTE
Computer systems that have an unshielded cable attached to a USB port may not
meet FCC Class B requirements, even if no device is attached to the cable. Use a
shielded cable that meets the requirements for full-speed devices.
For information about Refer to
The location of the USB connectors on the back panel Figure 10, page 46
The location of the front panel USB headers Figure 11, page 47
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