| 摘要 |
PURPOSE:To minimize the fluctuation of delay time in signal transmission and, at the same time, shorten the delay time as a whole. CONSTITUTION:In semiconductor integrated circuit having a six-layered wiring layer structure composed of the first layer in which gates are closely arranged, second layer 2 formed as a logical wiring layer, third layer 3, fourth layer 4, fifth layer 5, and sixth layer 6 formed as a power source layer, wiring is made in the longitudinal direction in the second and fourth layers 4 and transversal direction in the third and fifth layers 3 and 5 and the second layer 2 which is the lowest layer of the ordinary wiring layers, fifth layer 5 which is the highest layer of the ordinary wiring layers, or both layers 2 and 5 are used as the principal wiring layer which must be taken into account for the delay time in signal transmission. |
