Clock tree synthesis method
AssigneeRealtek Semiconductor Corp.
InventorsEn-Cheng Liu, I-Ching Tsai, Yun-Chih Chang
Life of this patent
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Abstract
The invention discloses a clock tree synthesis method including steps of: determining a driving strength of a clock cell; determining a reserved space corresponding to the clock cell according to the driving strength; generating the clock cell and the reserved space, wherein the reserved space is adjacent to the clock cell; setting a decoupling capacitor filler cell in the reserved space, wherein the area and/or capacitance of the decoupling capacitor filler cell are/is associated with the driving strength; and fixing the attribute(s) of the clock cell and the attribute(s) of the decoupling capacitor filler cell.
Claims7
A clock tree synthesis method comprising:
- selecting a clock cell;
- setting a keep-out margin for the clock cell;
- performing clock tree synthesis to generate the clock cell and a reserved space adjacent to the clock cell, wherein the size of the reserved space corresponds to the keep-out margin;
- inserting, in areas other than the clock cell and the reserved space, a plurality of filler cells containing polycrystals;
- removing the keep-out margin;
- inserting a decoupling capacitor filler cell in the reserved space, wherein an area and/or capacitance of the decoupling capacitor filler cell are/is related to the keep-out margin;
- removing the filler cells;
- and
- fixing a position of the clock cell and a position of the decoupling capacitor filler cell.
A clock tree synthesis method comprising:
- determining a driving strength of a clock cell;
- determining a reserved space corresponding to the clock cell according to the driving strength;
- generating the clock cell and the reserved space, wherein the reserved space is adjacent to the clock cell;
- inserting, in areas other than the clock cell and the reserved space, a plurality of filler cells containing polycrystals;
- inserting a decoupling capacitor filler cell in the reserved space, wherein an area and/or capacitance of the decoupling capacitor filler cell are/is related to the driving strength;
- removing the filler cells;
- and
- fixing a position of the clock cell and a position of the decoupling capacitor filler cell.
Dependencies are inferred from the claim text.