USB HSIC

What is HSIC?
HSIC (High-Speed Inter-Chip) is an industry standard for USB chip-to-chip interconnect with a 2-signal (strobe, data) source synchronous serial interface using 240 MHz DDR signaling to provide only high-speed (480 Mbps data rate). No external cables or connectors and hot plug-n-play are supported. There is also no analog transceivers, and hence reduces the complexity, cost, power consumption, and manufacturing risk. Low power can be achieved with 1.2 V LVCMOS signaling levels instead of the 3.3 V signaling requirement. Both data and strobe are bi-directional utilizing NRZI encoding. In addition, HSIC interface is always operated at high speed, 480 Mbps. Hence, no high-speed chirp protocol is needed during enumeration. Finally, HSIC USB is fully compatible with existing USB software stacks and provides all data transfer needs through a single unified USB software stack. For more technical information regarding the requirements to implement a HSIC USB solution, please refer to the High-Speed Inter-Chip USB Electrical Specification, Version 1.0 (a supplement to the USB 2.0 specification.) which is now available online at http://www.usb.org/developers/docs/docs

http://www.synopsys.com/dw/dwtb/hsic_usb2_device/hsic_usb2_device.html