BUFFER DEVICE HAVING MAIN BUFFER AND SMALLER SUB BUFFER, AND DRIVING METHOD OF THE BUFFER DEVICE USING DOMAIN OVERLAP

摘要

PURPOSE: A buffer device and a driving method of the buffer device are provided to reduce the chip size and to prevent the data loss due to a buffer overrun by having a main buffer and a smaller sub buffer and by using domain overlap. CONSTITUTION: A buffer device for interfacing between plural different domains, comprises a main buffer(21) having predetermined capacity; a sub buffer(22) having smaller capacity than the main buffer; an overlapped domain(23) that is the rest domain while subtracting the sub buffer from the main buffer. Wherein, each read pointer(RP1, RP2) and each write pointer(WP1, WP2) of the main buffer and the sub buffer use the overlapped domain(23) in common.