Intel Desktop Board DZ77BH-55K Technical Product Specification
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1.5.3 USB
The PCH contains 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 ten USB 2.0 ports and six USB 3.0 ports. Fourteen ports are
provided by the Intel Z77 Express Chipset and two ports are provided by a discrete
controller. The port arrangement is as follows:
• Six USB 3.0 ports:
Four ports are implemented with stacked back panel connectors (blue)
Two ports are implemented through one dual-port internal connectors (blue)
• Ten USB 2.0 ports:
Four ports are implemented with stacked back panel connectors (four black and
two orange high current charging ports)
Six front panel ports are implemented through three dual-port internal headers
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 12, page 48
The location of the front panel USB headers Figure 13, page 49
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