Semiconductor integrated circuit
A semiconductor integrated circuit includes a first cell spanning one of the p-wells and one of the n-wells adjacent to each other, and having one end on a dividing line inside the p-well and another end on a dividing line inside the n-well, and having a height determined by the one end and the another end; and a second cell, spanning another one of the p-wells and another one of the n-wells adjacent to each other, with a height covering the entire widths of the p- and n-wells measured along the column direction, the height of the second cell is double that of the first cell.
1. A semiconductor integrated circuit including a plurality of standard cells implemented by p-wells and n-wells, extending along the row direction, the row of the p-wells and n-wells are arranged periodically and alternately along the column direction, comprising:
a first cell spanning one of the p-wells and one of the n-wells adjacent to each other, and having one end on a dividing line inside the p-well and another end on a dividing line inside the n-well, and having a height determined by the one end and the another end; and
a second cell, spanning another one of the p-wells and another one of the n-wells adjacent to each other, with a height covering the entire widths of the p- and n-wells measured along the column direction, wherein the height of the second cell is double that of the first cell, and one end and another end of the second cell is different from a position of a cell border in the row direction of the first cell in the column direction, and
wherein a same row is included in the first cell and the second cell.
2. The semiconductor integrated circuit of claim 1 , further comprising one of low- and high-level power supply wires extending along the row direction in the vicinity of the center line of the row of the p-wells.
3. The semiconductor integrated circuit of claim 1 , further comprising one of low- and high-level power supply wires extending along the row direction in the vicinity of the center line of the row of the n-wells.
4. The semiconductor integrated circuit of claim 1 , wherein the high-level power supply wire detours around the second cell.
5. The semiconductor integrated circuit of claim 1 , wherein the low-level power supply wire detours around the second cell.
6. The semiconductor integrated circuit of claim 1 , wherein the one end and the another end of the first cell is different from a position of a cell border in the row direction of the second cell by half of the height of the first cell in the column direction.
7. The semiconductor integrated circuit of claim 1 , further comprising a filler provided in an empty space generated by a gap of heights between the first and second cells.
8. The semiconductor integrated circuit of claim 1 , wherein the first cell includes a functional circuit.
9. The semiconductor integrated circuit of claim 1 , wherein the second cell includes a functional circuit.
10. The semiconductor integrated circuit of claim 1 , wherein the p-and n-wells of the second cells have areas for disposing larger transistors than the transistors disposed in the p- and n-wells of the first cells.
11. The semiconductor integrated circuit of claim 1 , wherein a width in the row direction of the first cell is freely determined.
12. The semiconductor integrated circuit of claim 1 , wherein a width in the row direction of the second cell is freely determined.