| 摘要 |
A semiconductor memory device has a data masking function during a write operation. The semiconductor memory device includes a data mask input unit that receives a data mask signal. A data input unit receives data and delays the output of the data more than the output of the data mask signal. A write driver selectively drives the data outputted from the data input unit according to the data mask signal outputted from the data mask input unit. The semiconductor memory device ensures that the data mask signal is inputted into the write driver prior to the input of the data, thus preventing a timing mismatch between data and the data masking signal and poor data masking.
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