| 摘要 |
A row block selection circuit and a method for allocating row redundancy delay time are provided to increase t_RCD(Ras to Cas Delay time) by removing unnecessary row redundancy delay time. According to a row selection circuit for transmitting a block selection signal to a row decoder, a number of block signal generation parts(552,554,556,558) receive a pre-decoded address signal(DRAij) and output a block selection signal. A compensation cell driving part(560) receives the pre-decoded address signal, and outputs the block selection signal and a compensation command signal to the row decoder and the block signal generation part respectively, when the selected cell block does not operate normally. A delay circuit(510,520,530,540) delays the block selection pulse signal, and outputs a block selection signal by performing logic AND operation of the delayed block selection pulse signal and the compensation command signal. The delay circuit delays the block selection pulse signal for a constant time in proportion to signal movement time between the compensation cell driving part and the block signal generation part of the selected cell block.
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