USB IC Interface Buses

The USB 2.0 standard contains provisions for two different Integrated Circuit interfaces, [IC-to-IC buses] ~ Chip-to-Chip Bus.

The first interface bus is an implementation of the USB protocol using LVCMOS as the electrical interface. HSIC or High-Speed Inter-Chip uses DDR as the data transfer method, and operates at 240MHz, which is the only speed. A link was added off the Interface Buses 'H' page, and USB page.

The second USB IC interface is called Inter-IC USB, or IC_USB. This interface bus resembles USB more than the HSIC interface. A link was added of the Interface Buses 'I' page, and the USB page. This interface is a transition from the cable USB interface to the IC, after the connector.

Neither new page was listed to the IC Buses page, I'll need to do that later. The 'all buses' page is already getting to large, so the listing will not be added.

I used the 1-wire bus page as the starting point for both pages, which was also updated today.

In almost all cases a chip-to-chip interface only operates between two IC's on the same Printed Wiring Board [PWB], some times more than one IC. Normally an IC-to-IC bus will not drive a cable or a backplane, but there are always exceptions. LVDS is but one example that is both a chip-to-chip interface or cable interface, IEEE-644 is another.

I'll try and get these two pages into the sitemap before the end of the week.