| 摘要 |
PURPOSE:To reduce the number of input/output pins to facilitate making a circuit into an LSI by converting a refresh address to serial data and reconverting it to parallel data. CONSTITUTION:Up-counting of a refresh address counter 3 is started through a refresh address control circuit 2 in accordance with an interrupt signal from a request acceptance control circuit 103. A parallel refresh address outputted from the counter 3 is converted to serial data by a refresh address bit selecting circuit 105 and is supplied to a shift register 102 through one pin and is reconverted to parallel data and is stored in a refresh address register 104. By this transfer of serial data, the number of output/input pins is reduced and the refresh circuit including the register 102 and following circuits can be taken easily in the refresh control circuit which is made into an LSI and includes circuits up to the refresh address bit selecting circuit. |
