USB is the ubiquitous peripherals interconnect of choice for a large number of computing and consumer applications. Many systems provide a comprehensive set of drivers to support all commonly available USB peripherals. This enables consumers to purchase and use USB peripherals without having to install a new driver, thus strengthening the popularity of USB. In addition, Arasan supplies USB silicon, so costs are normally very low for product manufacturing of USB hosts and peripherals.
It is becoming increasingly attractive to use USB as a chip-to-chip interconnect within a product (without the use of external cables and connectors). However, because USB was designed to enable hot-plugging of peripherals over cables up to 5 meters in length, there are certain power and implementation issues that are not attractive for many chip-to-chip interconnect solutions.
USB 2.0 HSIC PHY
To better meet the needs of a USB chip-to-chip interconnect, HSIC removes the analog transceivers, thus reducing complexity, cost and manufacturing risk.
USB 2.0 HSIC PHY is a 2-signal (strobe, data) source-synchronous serial interface which uses 240Mhz DDR signaling to provide High-Speed 480Mps USB transfers which are 100% host driver compatible with traditional USB cable-connected topologies. Full-Speed (FS) and Low-Speed (LS) USB transfers are not directly supported by the HSIC interface (an HSIC enabled hub can provide FS and LS support, as well as IC_USB support).