Beyond VGA/LCD Display Controller
The Beyond VGA Display Controller core provides VGA capabilities for embedded systems. It supports both CRT and LCD displays with resolutions up to 2048x2048 and user programmable video timings, thus providing compatibility with almost all available LCD and CRT displays. The Display Controller supports a number of color modes, including 32bpp, 24bpp, 16bpp, 8bpp grayscale, and 8bpp-pseudo color. The video memory is located outside the primary core, thus providing the most flexible memory solution possible. It can be located on-chip or off-chip, shared with the system’s main memory (VGA on demand) or be dedicated to the VGA system. Image data is fetched automatically via the multiport AHB or WISHBONE Master interface, making this an ideal “program-and-forget” video solution. More demanding video applications, like streaming video or video games, can benefit from the video-bank-switching function. Flicker and cluttered images are reduced by automatically switching between video-memory pages and/or color lookup tables on each vertical retrace. The horizontal, vertical, and composite synchronization polarization levels, as well as the blanking polarization level are programmable by software.
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