FRAME INTERRUPT CIRCUIT OF VIDEO SIGNAL PROCESSING SYSTEM

摘要

PURPOSE: A frame interrupt circuit of an image signal processing system is provided to display plurality of conference participants by using only one monitor and to generate an interrupt when one frame image data is recorded in a memory. CONSTITUTION: The frame interrupt circuit of the image signal processing system includes a data write detector(21), two counters(22,23), a frame detector(25) and a frame interrupt signal generator(27). The data write detector combines a chip select signal(CS) and a read/write signal(R/W) of the frame memory to detect the writing of the data on the frame memory. The counters counts the output of the data write detector. The frame detector ANDs the outputs of the counters to detect the storage of the data of one frame in the frame memory. The frame interrupt signal generator receives the output of the frame detector and generates the frame interrupt signal. The data write detector further includes an OR gate(21) which performs OR of the read/write signal and the chip select signal.