Semiconductor memory device which can provide required data flexibly under simplified control and operating method therefor

摘要

An improved video RAM having two data registers for holding data of each row in a memory cell array 1. A transfer gate circuit transfers alternately data of each row of the memory cell array 1 to the two data registers. On the other hand, since a switching circuit selects data held in the two data registers alternately and provide the same serially. In addition, length of data to be provided can be controlled externally. When a special high speed data reading such as oblique reading is required, timing control of externally applied control signals can be simplified.