| 摘要 |
<p>The carry-line (2) comprises a plurality of MOSFETs (N15-N0) connected in series. MOSFETs (P15-N0) precharge each node (3-15 to 3-0) when they receive precharge signals /PR. In the case of high-order priority designated mode, when input signals (Q15-Q0) are given for turning on MOSFETs located between one end of the high-order bit side of the carry-line (2), the control circuit (5a) discharges the intermediate node (3-8) separately from the carry-line (2). In the case of low-order bit priority designated mode, when input signals (Q15-Q0) are given for turning on MOSFETs located between one end of the low-order bit side of the carry-line (2) and the intermediate node (3-8), the control circuit (5b) discharges the intermediate node (3-8) separately from the carry-line. <MATH></p> |
