Clock distribution circuit and layout design method using same
AssigneeNEC Electronics Corporation
InventorToshiaki NAKAHASHI
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Abstract
A layout design method in accordance with an exemplary aspect of the present invention is a layout design method for a clock tree circuit, including disposing a first clock distribution circuit in a clock tree circuit, wiring the clock tree circuit in which the first clock distribution circuit is disposed, verifying timing of the wired clock tree circuit, and replacing the first distribution element by a second clock distribution circuit based on a result of the timing verification, the second clock distribution circuit having roughly a same input load capacitance as the first clock distribution circuit and a different delay value from the first clock distribution circuit.
Claims9
A layout design method for a clock tree circuit, comprising:
- disposing a first clock distribution circuit in a clock tree circuit;
- wiring the clock tree circuit in which the first clock distribution circuit is disposed;
- verifying timing of the wired clock tree circuit;
- and
- replacing the first distribution element by a second clock distribution circuit based on a result of the timing verification, the second clock distribution circuit having roughly a same input load capacitance as the first clock distribution circuit and a different delay value from the first clock distribution circuit.
A clock distribution circuit comprising a first inverter circuit, the first inverter circuit comprising:
- serially-connected N transistors having a first conductive type (N is a natural number equal to or greater than 2);
- and
- M transistors having a second conductive type (M is a natural number equal to or greater than 1), the M transistors being connected in series with the N transistors having the first conductive type,
- wherein a delay value is adjusted by a combination of a pair of a transistor having the first conductive type and a transistor having the second conductive type of which an input signal is input to a control terminal.
Dependencies are inferred from the claim text.