Silicon Motion offers advanced display technology through USB and Network connections. SMI's CAT (Content Adaptive Technology) will compress display content to minimize the bandwidth needed to transmit content.
By offloading much of the compression work to a hardware accelerator, the CAT technology both runs faster and imposes less loading on the CPU. As will be shown later, this helps the SM768 to achieve very low CPU loading.
CPU loading depends on many variables, including the type of graphics or video signals to be compressed, the host CPU/graphics chipset, the amount of RAM available and the operating system. But in tests compressing an HD video clip for transfer over USB to dual HD displays on an Intel Core i5 chipset, the SM768 achieved an average loading some 22%-32% lower than that of competing devices
|USB graphics processor||Test set-up||CPU loading, range||CPU loading, average||Frame rate per second||Average CPU load/frame per second|
|SM768||Dual 1080 displays,USB 3.0 interface||33% - 48%||39.22%||102||102|
|Competitor 1||Dual 1080 displays,USB 3.0 interface||42% - 58%||50.13%||102||102|
|Competitor 2||Dual 1080 displays,USB 3.0 interface||46% - 61%||50.99%||91.34||91.34|
Compared to competing devices, then, SMI Graphics SoC offers much lower host CPU loading for an unimpaired user experience. This is backed by the excellent picture quality provided by the CAT compression feature, low latency in dual-display mode, low power consumption and compact dimensions. The architecture chosen by Silicon Motion also enables OEMs to implement complete docking station and other product designs with few external components.
The USB and CAT software as well as a real-time operating system run inside the SM768. The device also provides four USB 2.0 channels for connecting Human Interface Devices (HIDs) such as a wireless keyboard, mouse and dongle as well as a printer. This explains how it is able to support the latest docking station and dongle designs which are helping to bring greater flexibility, convenience and portability to many types of computing equipment in the home, office, store and factory. It is also worth noting that the same SM768 device also features a PCI-e interface for use with other types of hosts, enabling OEMs to develop designs both for the USB market and for other applications.