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OV511+ based on OV511, is a low cost and highly integrated soluTIon for USB PC cameraapplicaTIons. It remains OV511’s performance unchanged or is improved, while some newfeatures were implemented. New features include built-in USB transceiver with selectableexternal USB transceiver interface, more effecTIve packet size of the isochronous pipe,programmable LED control, programmable switching power clock with frequencies of24K/48K/96K/192KHz, etc.OV511+ is a USB PC camera controller that includes a proprietary compression enginesupporTIng real time image transfer through USB bus. A complete USB camera system consistsof OV511+, a 256Kx16 EDO DRAM, and a digital camera such as OV7620 for VGA resolution orOV6620 for CIF resolution.Camera Interface generates different image formats by taking either 16-bit YUV 4:2:2/RGB rawdata or 8-bit Y 4:0:0/RGB raw data inputs. OmniCE is the proprietary compression engine. It notonly performs 10~15fps for VGA and 30fps for CIF, but also allows very fast decompression withlow CPU utilization. Depending on the camera device that is built with the system, either SCCBor Parallel IO bus can be chosen. The SCCB bus master uses two dedicated pins “SIO-0” &“SIO-1”, while the PIO shares with Y & UV buses. Snapshot button allows users to take a highquality, VGA resolution uncompressed still imageThe functional blocks of OV511+, as shown in the following figure, consist of Camera Interface,DRAM Interface, OmniCE, UDC interface, ISO FIFO, System Control, SCCB and PIO.
