Memory module
A memory module and feedback loop technology, applied in the field of memory modules, can solve problems such as large skew and distortion of output data, and the problem that the output detection window cannot be determined, and achieve the effect of enhanced reliability
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[0028] Before describing the embodiments of the present invention, a description will be given of how timing adjustment of a clock signal is performed at the time of memory module development. Figure 1 shows the general construction of a DIMM. The DIMM 10 shown here includes a plurality of SDRAM devices 16, and a PLL-based clock driver 20 for distributing clock signals to the SDRAM devices.
[0029] In DIMM 10 , differential clock signals CLK, / CLK input via DIMM edge terminals are phase adjusted by PLL-based clock driver 20 before being distributed to individual SDRAM devices 16 . Here, / CLK is an alternative symbol for CLK with a horizontal line across it. Each SDRAM device 16 operates in synchronization with the supplied clock signal, and outputs differential data DQS, / DQS to the DIMM edge terminal. In the DIMM 10, reference numeral 12 designates a CLK terminal (or / CLK terminal), and 14 designates a DQS terminal (or / DQS terminal). The wiring pattern for the clock sign...
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