| 摘要 |
PURPOSE: A semiconductor chip, having a bus circuit like an embedded processor, is provided to reduce power consumption for a bus circuit without increasing an area of a chip. CONSTITUTION: The device, a semiconductor chip, comprises a bus A(30), a bus B(31), a CPU(32), a registry file, a DRAM(34), a PIO(Parallel I/O, 35), and a driver cell(36). The CPU(32) is connected to the bus A(30). The DRAM(34) is connected to the bus B(31). The driver cell(36) is for driving the bus A(30) and the bus B(31). Namely, the plural function blocks, consisting of the semiconductor chip, are partitioned in two groups, i.e. a group of frequently accessing function blocks and a group of relatively infrequently accessing function blocks, which are connected to the bus A(30), and the bus B(31), respectively. The bus driver cell includes a bus driver for driving the bus B(31) and an input latch for receiving data from the bus B(31). The bus driver uses a three phase inverter, and the input latch includes a three phase inverter and two inverters. The structure of the bus driver cell for driving the bus A(30) is the same as that of the bus driver cell for driving the bus B(31).
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