Method and apparatus for generating memory clock of video controller

The present invention relates to a video controller which automatically changes the memory clock at the frequency of the command of the control memory, which stores the image data to be transferred to the monitor video memory; Susinneun a command transmitted via the host bus from the CPU bus interface; According to the instructions received from the bus interface control means for generating address, data, and control signals for controlling the read / write memory for the video; At a predetermined time unit, for setting a frequency by varying the frequency of the memory clock for the video memory access in accordance with the occupancy of the video memory access cycle for the entire bus cycle setting means; And to characterized in that it includes a frequency generation means for generating a memory-click according to the set memory click frequency, the number of memory access cycles increases, increasing the frequency of the memory clock signal to a maximum as well as the best performance of the memory access When there is a small number automatically advantages that can minimize power consumption by lowering the chip to the memory clock frequency.