Device for creating timing constraints
AssigneeRenesas Technology Corp.
InventorGenichi Tanaka
Life of this patent
Estimating the term…
Abstract
A datapath extraction unit extracts, from among datapaths on which a timing verification is to be performed, those datapaths from a netlist, timing constraints, and a cell library, that are established between at least two child blocks of a parent block. A datapath output unit prepares and presents to a user a datapath list in which timing exceptions can be specified. A timing constraint modification unit modifies the previous timing constraints according to the timing exceptions specified by the user and creates new timing constraints.
Claims14
A device for creating timing constraints for a semiconductor integrated circuit designed using a hierarchical design, the device comprising:
- a datapath extraction unit that extracts datapaths on which a timing verification is to be performed, wherein the datapath extraction unit extracts the datapaths, which are established between at least two child blocks in a parent block, from a cell library that includes description of logic function and timing information of each cell in the parent block, timing constraints that include definitions of any clocks of the semiconductor integrated circuit, and a netlist that includes connection information between cells in the parent block;
- a datapath output unit that creates a datapath list which allows a user to selectively specify a timing exception corresponding to a datapath extracted, and displays the datapath list, for the user;
- and
- a timing constraints modification unit that creates new timing constraints by modifying existing timing constraints based on the timing exception specified by the user.
Dependencies are inferred from the claim text.