The W9967CF is a digital video processing chip offered by Winbond to facilitate adapterless connection between digital video camera and personal computer for video and still image capturing and editing, video e-mail, and video conferencing applications. Low-cost, high-performance, and high-quality digital video camera can be realized by using Winbond¢s W9967CF, which includes Universal Serial Bus (USB) technology and the international standard JPEG compression.
The digital video camera is becoming the next great input device for the PC. USB is now a common PC standard for connecting peripheral products, which features low cost, hot-attachable plug and play, adequate 12 Mb/s full speed bandwidth, and simultaneous attachment of multiple devices. The W9967CF has built-in full speed USB controller which benefits from using the isochronous data transfer mode of the USB bus, and which is compliant with the full power management requirements of the USB specification, including startup, operating, and suspend modes. To prevent saturation of the USB bus, the W9967CF uses no more than 8 Mb/s of available bandwidth to ensure the continued operation of other low bandwidth devices such as USB mice and keyboards.
Although USB provides a low-cost solution for low to medium speed peripherals, its 12 Mb/s bandwidth is not enough for high-quality and high-performance digital video camera. High-quality and low-cost compression is necessary to boost frame rate for a high-performance digital video camera.
The W9967CF has built-in the baseline JPEG compression, which corresponds to the ISO/IEC international standard 10918-1, with YCbCr4:2:2 or YCbCr4:2:0 components in non-interleaved scan. The baseline JPEG implementation in the W9967CF includes Discrete Cosine Transform (DCT), quantization, zig-zag scan, and Huffman encoder. With JPEG compression, the W9967CF can easily achieve good quality 30 frames per second (fps) in CIF r
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