| 摘要 |
PROBLEM TO BE SOLVED: To suppress signal reflection by a simple method in a DDR memory system composed of chip selects having different data bus widths. SOLUTION: The DDR (double data rate) memory system is provided with a function for controlling ODT (on die termination) for each chip select, and is further provided with a memory controller, a first data bus and a second data bus connected to the memory controller, a first chip select connected to the first data bus, and a second chip select connected to the first data bus and the second data bus. The ODT resistance of the first chip select is controlled according to the ODT resistance (reference value) of the second chip select. COPYRIGHT: (C)2009,JPO&INPIT
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