Method and apparatus for specifying multiple power domains in electronic circuit designs

• US 6,083,271 A
• Filed: 05/05/1998
• Issued: 07/04/2000
• Est. Priority Date: 05/05/1998
• Status: Expired due to Term
• 

• Current Assignee: Bell Semiconductor, LLC (Hilco Inc. (d/b/a Hilco Global))
• Original Assignee: LSI Logic Corporation (Broadcom, Inc.)
• Inventors: Morgan, David Allen
• Primary Examiner(s): Lintz, Paul R.
• Assistant Examiner(s): GARBOWSKI, LEIGH M
• Application Number:
  US09/072,566
• Time in Patent Office: 791 Days
• Field of Search: 395/500.02, 395/500.05, 395/500.06, 395/500.08, 395/500.2, 364/488, 364/489, 364/490, 364/491, 716/1, 716/2, 716/7, 716/8, 716/9, 716/13
• US Class Current: 716/120
• CPC Class Codes: G06F 30/30 Circuit design

Abstract

Methods and apparatus for use with electronic circuit design tools to define and test multiple power and ground domains within an electronic circuit design. The present invention defines a power and ground specification associated with a CAD/CAE tools design database. To build the power and ground specification, first, power and ground domains are defined and the circuit design is partitioned into one or more groups of devices which correspond to the power and ground domains. Second, power and ground signals are associated with these defined groups of devices. Lastly, this information is stored within a power and ground specification integrated with the information within the design database to allow the CAD/CAE tools to test the multiple power and ground domains within the IC or circuit board design.

Claims

1. A computer operable method for managing multiple power and ground connections within an electronic circuit design, said method comprising the steps of:

defining within a design database a plurality of groups, each group comprising at least one device from said circuit design;

defining within a desian database a plurality of power and ground attributes wherein a portion of said plurality of power and ground attributes are associated with said plurality of groups in said circuit design and a portion of said plurality of power and ground attributes are associated with said power and ground connections in said circuit design; and

establishing connectivity between said plurality of groups and said multiple power and ground connection by associating at least one power and ground connection of said multiple power and ground connections with at least one group of said plurality of groups in accordance with said power and ground attributes within said design database;

.

2. The method of claim 1 wherein the step of defining a plurality of groups includes the step of:

receiving user input identifying devices associated with each said group.

3. The method of claim 1 wherein the step of defining a plurality of groups includes the steps of:

identifying at least one power and ground attribute associated with a portion of a plurality of devices in said circuit design; and

defining a group comprising said plurality of devices.

4. The method of claim 3 wherein said at least one power and ground attribute identifies at least one of said plurality of power and ground connections.

5. The method of claim 3 wherein said at least one power and ground attribute is common to each of said plurality of devices comprising said group.

6. The method of claim 3 wherein said at least one power and ground attribute identifies the physical proximity characteristic of said plurality of devices comprising said group.

7. The method of claim 6 wherein said at least one power and ground attribute identifies said physical proximity characteristic of said plurality of devices for at least one core Cell.

8. The method of claim 6 wherein said at least one power and ground attribute identifies said physical proximity characteristic of said plurality of devices for at least one I/O Cell.

9. The method of claim 1 wherein at least one of said plurality of power and ground attributes identifies the physical proximity characteristic of devices in at least one of said plurality of groups.

10. The method of claim 1 wherein at least one of said plurality of power and ground attributes identifies at least one of said plurality of power and ground connections.

11. The method of claim 1 wherein at least one of said plurality of power and ground attributes include at least one user-defined power and ground attribute.

12. The method of claim 1 wherein said plurality of power and ground attributes include user defined attributes and wherein the step of establishing connections by associating includes the step of:

associating at least one power and ground connection of said plurality of power and ground connections with at least one group of devices of said plurality of groups of devices in accordance with said user defined attributes.

13. The method of claim 1 wherein said electronic circuit design comprises an integrated circuit.

14. A program storage device readable by a machine, tangibly embodying a program of instructions executable by the machine to perform method steps, for managing multiple power and ground connections within an electronic integrated circuit design, said method including the steps of:

defining within a design database a plurality of groups, each group comprising at least one device from said circuit design;

defining within a design database a plurality of power and ground attributes wherein a portion of said plurality of power and ground attributes are associated with said plurality of groups in said circuit design and a portion of said plurality of power and ground attributes are associated with said power and ground connections in said circuit design; and

establishing connectivity between said plurality of groups and said multiple power and ground connection by associating at least one power and ground connection of said multiple power and ground connections with at least one group of said plurality of groups in accordance with said power and ground attributes within said design database;

.

15. The program storage device of claim 14 wherein the step of defining a plurality of groups includes the steps of:

identifying at least one power and ground attribute associated with a portion of a plurality of devices in said circuit design; and

defining a group comprising said plurality of devices.

16. The program storage device of claim 14 wherein at least one of said plurality of power and ground attributes identifies the physical proximity characteristic of devices in at least one of said plurality of groups.

17. The program storage device of claim 14 wherein at least one of said plurality of power and ground attributes identifies at least one of said plurality of power and ground connections.

18. An apparatus operable within computer aided electronic design tools, for managing multiple power and ground connections within an electronic integrated circuit design, said apparatus including:

means for defining a plurality of groups in a desian database, each group including at least one cell from said integrated circuit design;

means for defining a plurality of power and ground attributes in a design database wherein a portion of said plurality of power and ground attributes are associated with said plurality of groups in said integrated circuit design and a portion of said plurality of power and ground attributes are associated with said power and ground connections in said circuit design; and

means for establishing connectivity between said plurality of aroups and said multiple power and ground connections by associating at least one power and ground connection of said multiple power and ground connections with at least one group of said plurality of groups in accordance with said power and ground attributes within said design database.

19. The apparatus of claim 18 wherein the means for defining a plurality of groups includes:

means for identifying at least one power and ground attribute associated with a portion of a plurality of devices in said circuit design; and

means for defining a group comprising said plurality of devices.

20. The apparatus of claim 18 wherein at least one of said plurality of power and ground attributes identifies the physical proximity characteristic of devices in at least one of said plurality of groups.

21. The apparatus of claim 18 wherein at least one of said plurality of power and ground attributes identifies at least one of said plurality of power and ground connections.

22. A method for establishing connectivity between cells in a circuit and multiple power and ground connections comprising the steps of:

defining a plurality of group attributes in a design database;

defining multiple power and ground connections in said design database;

associating in said design database a portion of said plurality of group attributes with each of said multiple power and ground connections;

associating in said design database a portion of said plurality of group attributes with each of said cells in said circuit; and

establishing connectivity between said cells of said circuit and said multiple power and ground connections by matching said group attributes associated with said multiple power and ground connections with said group attributes associated with said cells.

23. The method of claim 22 wherein at least one attribute of said plurality of group attributes identifies the physical proximity characteristic of said cells.

24. The method of claim 23 wherein said at least one attribute identifies said physical proximity characteristic for at least one Core Cell of said plurality of cells.

25. The method of claim 23 wherein said at least one attribute identifies said physical proximity characteristic for at least one I/O Cell of said plurality of cells.