The Design And Implementation Of The OSD In Digital Media Processor

OSD (On screen display) system is the foundation of intercommunion between product and customer, send the video signals dealed with by OSD to customers, so it plays a important role in the contention of the markets.Based on existing OSD theory, this paper is absorbed in unique characteristics of the design, including: optimizing OSD inside frame and expand the function of it. Especially for the scaling of Chinese character, we extract the parameter of the vector fonts from the Window vector fonts, and create new minitype vector fonts for this system. For this way, we can eliminate the distortion when scale the Chinese character. Beside it, aim to the so many functions of the OSD system, we have a programmable design, the users can select the IP they need to form the OSD for the different product. Thereby we can decrease the repeatable work and shorten the cycle of the research. There are three parts in this thesis: system design, hardware implement and deep discussion.The OSD system design is partitioned into several parts as follows: function definition, system structure design, arithmetic research and confirmation, RTL coding, simulation and verification.In the processing of discussing implementation of hardware, in concrete design processing, skills of writing synthesizable VerilogHDL codes are explained in detail and discuss some problems in the verification.Finally several problems related to implementation are discussed and summarized.This design is a part of video processing integrated circuits, the system will be used in video decoder chip and TV in the future.