主权项 |
1. A method for adjusting output, timing of a plurality of memory devices, the method comprising the steps of:
providing a clock signal to each of the plurality of memory devices, wherein each one of the plurality of memory devices delays the clock signal in a respective variable delay circuit to provide a respective output clock signal; sequentially issuing read commands to each of the plurality of memory devices, whereby each one of the plurality of memory devices provides read data in synchronization with the respective output clock signal; receiving read data from each of the plurality of memory devices; determining a respective delay time for each of the plurality of memory devices, wherein the respective delay time is indicative of an elapsed period between a time at which the read command is issued to the respective memory device and a time at which the read data is provided by the respective memory device; identifying a slowest memory device as the memory device having the longest delay time; and adjusting the respective variable delay circuit in each of the plurality of memory devices other than the slowest memory device so as to make the delay time for the memory device substantially the same as the delay time of the slowest memory device. |