Semiconductor integrated circuit and method of operating the same

A semiconductor integrated circuit comprising:

• a first clock network configured to divide a clock signal into first output clock signals with a high frequency;
• a second clock network configured to divide the clock signal into second output clock signals with a non-high frequency;
• a plurality of selection circuits configured to be connected between the first clock network and the second clock network, and configured to select and output one of the first output clock signals and the second output clock signals, according to a power mode;
• and
• a plurality of clock sinks configured to sink output clock signals respectively output from the selection circuits.

A semiconductor integrated circuit comprising:

• a first clock network configured in a mesh structure to generate first output clock signals;
• a second clock network configured in a tree structure to generate second output clock signals;
• a plurality of selection circuits configured to receive the first output clock signals and the second output clock signals, each of the selection circuits is configured to select and output one of the first output clock signals or one of the second output clock signals, according to a power mode;
• and
• a plurality of clock sinks configured to receive the one of the first output clock signals or one of the second output clock signals from respective selection circuits, each of the clock sinks is configured to sink the one of the first output clocks signals or one of the second output signals output from a respective selection circuit,
• wherein the plurality of selection circuits is further configured to be connected between the first clock network and the second clock network.