Layout circuit having a combined tie cell
First Claim
1. A circuit layout method, comprising:
- placing and routing standard cells on a layout area;
adding a spare cell on the layout area, wherein the spare cell is provided for replacing one of the standard cells while adding or changing function; and
adding a combined tie cell on the layout area for tying a voltage provided to the replaced standard cell, wherein the combined tie cell is independent of the standard cells.
1 Assignment
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Accused Products
Abstract
A layout circuit is provided, comprising standard cells, a spare cell, combined tie cells and normal filler cells. The standard cells are disposed and routed on a layout area. The spare cell is added on the layout area and provided for replacing one of the standard cells while adding or changing functions later. The combined tie cells are added on the layout area. The normal filler cells are added on the rest of the layout area. The combined tie cell comprises a tie-high circuit, a tie-low circuit and a capacitance circuit. Some standard cells are disposed near at least one combined tie cell for avoiding routing congestion between the combined tie cells and the replaced standard cell. A circuit layout method is also provided.
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Citations
16 Claims
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1. A circuit layout method, comprising:
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placing and routing standard cells on a layout area; adding a spare cell on the layout area, wherein the spare cell is provided for replacing one of the standard cells while adding or changing function; and adding a combined tie cell on the layout area for tying a voltage provided to the replaced standard cell, wherein the combined tie cell is independent of the standard cells. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A layout circuit, comprising:
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standard cells disposed on a layout area; a spare cell disposed on the layout area, wherein the spare cell is provided for replacing one of the standard cells; and a combined tie cell disposed on the layout area for tying a voltage provided to the replaced standard cell, wherein the combined tie cell is independent of the standard cells. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification