| 摘要 |
In a semiconductor device, a plurality of interface cells is disposed on four sides of an LSI chip in connection with a logic circuit area including a plurality of logic cells. Each interface cell may include four functional blocks which are vertically or horizontally aligned without being rotated, thus forming an I/O buffer. The left I/O buffer has a vertical layout in which functional blocks are vertically aligned, whilst the upper I/O buffer has a horizontal layout in which functional blocks are horizontally aligned. This makes it possible to fix the same length direction of gates of transistors with respect to both the functional blocks of I/O buffers and the logic cells, so that engineers do not need to consider characteristic variations of transistors due to positional differences of transistors when designing the circuitry of an LSI chip.
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