| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a memory interface circuit which does not need special calibration and receives correct data by removing glitch caused in a data strobe signal. <P>SOLUTION: The memory interface comprises input receivers (buffers) 102 for receiving the data strobe signals DQS, a mask control signal generating circuit 107 for generating a mask control signal REN, a delay circuit 104 for delaying the inputted DQS to output a delayed signal DQSD, an I/O replica circuit 103 for delaying the REN by a delay amount corresponding to the input/output delay characteristic of input/output buffers, a delay circuit 105 for delaying RENFB by the replica circuit following to the delay of the DQS to output a delay-controlled signal REND, and a mask circuit 106 for generating the data strobe signal by using the REND as a reference timing to generate a mask signal and masking the delayed signal DQSD corresponding to the mask signal for a preset time to remove the glitch. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
