Video,Display,Controller,AVide business, insurance Video Display Controller
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AVideo Display Controller or VDC is an integrated circuit which is themain component in a video signal generator, a device responsible forthe production of a TV video signal in a computing or game system.Some VDCs also generate a sound signal, but in that case it's nottheir main function.VDCswere most often used in the old home-computers of the 80s, but alsoin some early video game systems.TheVDC is always the main component of the video signal generator logic,but sometimes there are also other supporting chips used, such as RAMto hold the pixel data, ROM to hold character fonts, or perhaps somediscrete logic such as shift registers were necessary to build acomplete system. In any case, it's the VDC's responsibility togenerate the timing of the necessary video signals, such as thehorizontal and vertical synchronization signals, and the blankinginterval signal.Mostoften the VDC chip is completely integrated in the logic of the maincomputer system, (its video RAM appears in the memory map of the mainCPU), but sometimes it functions as a co processor that canmanipulate the video RAM contents independently from the main CPU.Typesof Video Display ControllersThefew types of controllers are discussed below :Videoshifters, or "Video shift register based systems" are themost simple type of video controllers; they are responsible for thevideo timing signals, but they normally do not access the Video RAMdirectly. They get the video data from the main CPU, a byte at atime, and convert it to a serial bit stream (hence the technical name"Video shifter"). This serial data stream is then used,together with the synchronization signals, to output a (color) videosignal. The main CPU needs to do the bulk of the work. Normally thesechips only support a very low resolution Raster graphics mode. ACRTC, or CRT Controller, generates the video timings and reads videodata from a RAM attached to the CRTC, to output it via an externalcharacter generator ROM, (for text modes) or directly, (for highresolution graphics modes) to the video output shift register.Because the actual capabilities of the video generator depend to alarge degree on the external logic, video generator based on a CRTCchip can have a wide range of capabilities. From very simple (textmode only) systems to very high resolution systems supporting a widerange of colors. Sprites however are normally not supported by thesesystems. Videointerface controllers are much more complex than CRT controllers, andthe external circuitry that is needed with a CRTC is embedded in thevideo controller chip. Sprites are often supported, as are (RAMbased) character generators and video RAM dedicated to colorattributes and palette registers (Color lookup tables) for thehigh-resolution and/or text-modes.Videoco processors have their own internal CPU dedicated to reading (andwriting) their own video RAM, and converting the contents of thisvideo RAM to a video signal. The main CPU can give commands to the coprocessor, for example to change the video modes or to manipulate thevideo ram contents. The video co processor also controls the (mostoften RAM based) character generator, the color attribute RAM,Palette registers and the Spite logic (as long as these exist ofcourse). Engineering Services Article Tags: Video Display Controller, Video Display, Display Controller, Video Signal, Most Often
Video,Display,Controller,AVide