Universal Serial Bus (USB). EKF PC3-ALLEGRO

User Guide • PC3-ALLEGRO • CompactPCI

®

PlusIO CPU Board • Intel® i7-3xxx Processor

Universal Serial Bus (USB)

The PC3-ALLEGRO is provided with twelve USB ports. All of them are USB 2.0 capable, but two ports, routed to front panel connectors, are also supporting the USB 3.0 SuperSpeed standard.

The USB 2.0 interfaces are distributed to the front panel (two ports), two to the expansion board interface connectors J-EXP, four to the high speed expansion connector J-HSE, and four ports are available across the backplane connector J2.

The front panel USB connectors can source a minimum of 1.5A/5V each, over-current protected by two electronic switches. Protection for the USB ports on the expansion interfaces and on the J2 PlusIO connector is located on expansion boards. The USB xHCI and two EHCI controllers handling the USB port operation at SuperSpeed, high-speed, full-speed and low-speed are integrated into the QM77

PCH.

Utility Interfaces

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Besides the high speed mezzanine interface connectors J-HSE and J-PCIE, the PC3-ALLEGRO is provided with the utility interface expansion connector socket J-EXP. This connector comprises several interfaces, which may be useful for system expansion on mezzanine cards, as an option:

HD Audio

LPC (Low Pin Count)

SMBus

2 x USB

The SMBus is controlled by the QM77 platform controller hub. The SMBus signal lines on the J-EXP utility expansion connector can be switched on/off under software control (PCH GPIO) in order to isolate external components in case of an I

2

C address conflict.

The HD Audio port requires an additional audio codec, as provided e.g. on the PCS-BALLET side card.

The LPC bus presents an easy way to add legacy interfaces to the system. EKF offers a variety of mezzanine expansion boards (side cards), to be attached on top of the PC3-ALLEGRO, featuring all classic Super-I/O functionality, for example the PCS-BALLET or the CCO-CONCERT. Access to the connectors PS/2 (mouse, keyboard), COM, USB and audio in/out is given directly from the front panel.

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