| 摘要 |
PURPOSE: A DQS(data strobe signal) generator of a semiconductor device is provided to output plural data in a single clock cycle. CONSTITUTION: A DQS generator(300) includes a preamble controller(302) to control the preamble state of a DQS. A pull up/down signal generator(304) receives first/second control signals for generating pull up/down signals. A DQS driver(308) outputs the DQS in response to the pull up/down signals. The preamble controller generates preamble control pulses by detecting the rising edge of DQS control signals. The pull up signal node of first pull up/down signal drivers(306a,316a,326a) and the pull down signal node of second pull up/down signal drivers(306b,316b,326b) are inputted to a pull up signal input terminal(402a) of the DQS driver. The pull down signal node of the first pull up/down signal driver and the pull up signal node of the second pull up/down signal drivers are inputted to a pull down signal input terminal(402b) of the DQS driver.
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