SEMICONDUCTOR INTEGRATED CIRCUIT, APPARATUS WITH SEMICONDUCTOR INTEGRATED CIRCUIT, AND CLOCK CONTROL METHOD IN SEMICONDUCTOR INTEGRATED CIRCUIT

摘要

A semiconductor integrated circuit includes, a fixed frequency-division clock generation unit configured to generate a fixed frequency-division clock with a fixed frequency based on an output clock of a clock source, a variable frequency-division clock generation unit configured to generate a variable frequency-division clock with a variable frequency based on the output clock of the clock source, and a data path selection unit configured to select a data path. The data path selection unit selects a data path with or without a synchronization unit for converting the data into clock-synchronous data on a receiving side according to whether the variable frequency-division clock is or is not, respectively, generated by the variable frequency-division clock generation unit.

主权项

1. A semiconductor integrated circuit comprising:
a fixed frequency-division clock generation unit configured to generate a fixed frequency-division clock with a fixed frequency based on an output clock of a clock source; a variable frequency-division clock generation unit configured to generate a variable frequency-division clock with a variable frequency based on the output clock of the clock source; and a data path selection unit configured to select a data path as a data path for transferring data between a first functional module operating based on the fixed frequency-division clock and a second functional module operating based on the variable frequency-division clock, wherein, while the variable frequency-division clock is generated by the variable frequency-division clock generation unit, the data path selection unit selects a data path using a synchronization unit for converting the data into clock-synchronous data on a receiving side, and wherein, while the variable frequency-division clock is not generated by the variable frequency-division clock generation unit, the data path selection unit selects a data path without using the synchronization unit.