Overview

The LC82221L is a full-color digital image data expansion IC that accepts data in formats that essentially conform to the JPEG standard. With the provision of frame memory, this IC can input and output image data in standard video formats. In addition, it also supports a wide range of image display functions using that frame memory. As compared to earlier JPEG ICs, this IC features simplified JPEG functionality and a greater emphasis on display functions. Thus it supports the creation of excellent cost-performance ratio systems for applications that require a display system.

特性 Features

? High image quality image expansion using the JPEG system

? Superlative cost performance achieved by only providing decoding functions.

? Two built-in quantization tables.

? High-speed processing achieved by using fixed Huffman tables. Application do not have to set up these tables.

? Two Huffman tables, one for luminance data and one for chrominance data, are provided.

? Supports scaling factor parameters that allow the quantization factor to be changed.

? DRAM for code data buffering and image data playback can be connected directly.

? Applications can use either 2Mb or 4Mb DRAMs based on the sizes of the image handled and the structure of the system. However, 16-bit data path DRAMs must be used.

? Image data is output in synchronization with an image display synchronizing signal.

? Color structure of the code data is Y:U:V=4:1:1.

? Dedicated code data input bus provided to avoid loading the host bus. DMA transfers are also supported.

? Users can select either RGB or YUV for image data output.

? Built-in YUV to RGB color conversion circuit

? The LC82221L supports image sizes up to 1024 pixels in the horizontal direction. The range of vertical sizes handled can be set up arbitrarily, since it is limited by the size of the DRAM provided.

? 3.3-V single-voltage power supply. Low power.

? The display position and display size can be set.

? SOI and EOI marker support

? Horizontal and vertical scrolling display functions

? Support for overwrite display, in which the next data for expansion is displayed by overwriting the previously expanded image data