METHOD FOR PREVENTING WRINGING EFFECT IN DDR SDRAM AND APPARATUS FOR THE SAME, ESPECIALLY PREVENTING WRINGING EFFECT BY DQS BUFFER

摘要

PURPOSE: A method for preventing the wringing effect in DDR SDRAM and an apparatus for the same are provided to prevent the wringing effect by DQS buffer in such a way that the DQS signal having the wringing effect does not pass the DQS buffer. CONSTITUTION: A method for preventing the wringing effect in DDR SDRAM includes the steps of: (a) receiving a plurality of data through the data input buffer; (b) storing the DQS signal outputted from the DQS buffer on the DQS latch; (c) generating the second signal with synchronizing the falling edge of the DQS signal; (d) storing the first data among the plurality data outputted from the data input buffer to the data input latch; (e) storing the second data among the plurality of the data outputted from the data input buffer on the data input latch; (f) transmitting the first and the second data stored at the data input latch to the data input/output sense amplifier; and (g) controlling the operation of the DQS buffer by discriminating the time finishing the burst length.