Automated circuit design

• US 9,069,920 B2
• Filed: 01/27/2014
• Issued: 06/30/2015
• Est. Priority Date: 10/04/2004
• Status: Active Grant

• Current Assignee: Synopsys Incorporated
• Original Assignee: Synopsys Incorporated
• Inventors: Tian, Bing, McElvain, Kenneth S.
• Primary Examiner(s): Parihar, Suchin
• Application Number:
  US14/165,466
• Publication Number:
  US 20140143743A1
• Time in Patent Office: 519 Days
• Field of Search: 716/100, 716/103
• US Class Current: 1/1
• CPC Class Codes: G06F 30/30 Circuit design
• CPC Class Codes: G06F 30/327 Logic synthesis; Behaviour synthesis, e.g. mapping logic, HDL to netlist, high-level language to RTL or netlist
• CPC Class Codes: G06F 30/394 Routing G06F30/396 takes precedence

Abstract

A method implemented on a data processing system for circuit synthesis is discussed. In one embodiment, the method comprises determining a net of a circuit design, the net driving one or more first loads to use a first type of routing resources and one or more second loads to use a second type of routing resources, and splitting the net into a first net and a second net, the first net driving the one or more first loads, the second net driving the one or more second loads.

Claims

1. A method implemented on a data processing system for circuit synthesis, the method comprising, upon receiving a circuit design:

determining, using a processor, a net of the circuit design, the net including a first driver driving one or more control loads via a first routing resource and one or more non-control loads via a second routing resource; and

purifying the net into a first net and a second net, the first net including the first driver driving the one or more control loads via the first routing resource, the second net having a second driver driving the one or more non-control loads via the second routing resource;

the first driver and the second driver having the same inputs;

wherein the first net and the first routing resource are optimized during a placement and routing phase for routing the control loads;

wherein the first net and the second net, and the first driver and the second driver are used in the implementation of a resulting circuit design in a vendor'"'"'s technology/architecture dependent integrated circuit.

2. The method of claim 1, wherein said purifying comprises:

replicating the first driver of the net to generate the second driver driving the second net.

3. The method of claim 1, wherein said purifying comprises:

identifying a second driver comprising a replication of the first driver of the net; and

configuring the second driver to drive the second net.

4. The method of claim 1, wherein each of the control loads comprise one or more of:

a clock pin;

a reset pin;

a set pin;

a register enable pin;

or

a multiplexer select pin.

5. The method of claim 4, wherein the first and second routing resources of the circuit design is for field programmable gate arrays (FPGA).

6. The method of claim 1, wherein the one or more non-control loads comprises a logic gate load.

7. A non-transitory machine readable medium containing executable computer program instructions which when executed by a digital processing system cause said system to perform a method for circuit synthesis, the method comprising upon receiving a circuit design:

determining a net of the circuit design, the net driving one or more control loads via a first routing resource and one or more non-control loads via a second routing resource; and

purifying the net into a first net and a second net, the first net including the first driver driving the one or more control loads via the first routing resource, the second net driving the one or more non-control loads via the second routing resource;

the first driver and the second driver having the same inputs;

wherein the first net and the first routing resource are optimized during a placement and routing phase for routing the control loads;

wherein the first net and the second net, and the first driver and the second driver are used in the implementation of a resulting circuit design in a vendor'"'"'s technology/architecture dependent integrated circuit.

8. The medium of claim 7, wherein said purifying comprises:

replicating the first driver of the net to generate the second driver driving the second net.

9. The medium of claim 7, wherein said splitting purifying comprises:

identifying the second driver comprising a replication of the first driver of the net; and

configuring the second driver to drive the second net.

10. The medium of claim 7, wherein each of the one or more control loads comprise one or more of:

a clock pin;

a reset pin;

a set pin;

a register enable pin;

or

a multiplexer select pin.

11. The medium of claim 7, wherein the first and second routing resources of the circuit design is for field programmable gate arrays (FPGA).

12. The medium of claim 7, wherein the one or more non-control loads comprises a logic gate load.

13. A data processing system for circuit synthesis, the data processing system comprising:

a memory; and

a processor coupled to the memory, wherein the processor, upon receiving a circuit design, is configured to determine a net of the circuit design, the net including a first driver driving one or more control loads via a first routing resource and one or more non-control loads via a second routing resource; and

the processor configured to purify the net into a first net and a second net, the first net having the first driver driving the one or more control loads, the second net having a second driver driving the one or more non-control loads, the first driver and the second driver having the same inputs;

wherein the first net and the first routing resource are optimized during a placement and routing phase for routing the control loads;

wherein the first net and the second net, and the first driver and the second driver are used in the implementation of a resulting circuit design in a vendor'"'"'s technology/architecture dependent integrated circuit.

14. The data processing system of claim 13, further comprising:

said processor further configured to replicate the first driver element of the net to generate a second driver driving the second net.

15. The data processing system of claim 13, further comprising:

said processor further configured to locate a replication of the first driver of the net; and

configure the replication driver as the second driver to drive the second net.

16. The data processing system of claim 13, wherein each of the one or more control loads comprises one or more one of:

a clock pin;

a reset pin;

a set pin;

a register enable pin;

or

a multiplexer select pin.

17. The data processing system of claim 13, wherein the first and second routing resources of the circuit design is for field programmable gate arrays (FPGA).

18. The data processing system of claim 13, wherein the one or more non-control loads comprises a logic gate load.

19. A data processing system for circuit synthesis, comprising:

means for determining a net of a circuit design, the net having a first driver driving one or more control loads to use a first routing resource and one or more non-control loads to use a second routing resource; and

means for purifying the net into a first net and a second net, the first net having the first driver driving the one or more control loads via first routing resource, and the second net having a second driver driving the one or more non-control loads via the second routing resource, the first river and the second driver having the same inputs;

wherein the first net and the first routing resource are optimized during a placement and routing phase for routing the control loads;

wherein the first net and the second net, and the first driver and the second river are used in the implementation of a resulting circuit design in a vendor'"'"'s technology/architecture dependent integrated circuit.

20. The data processing system of claim 19, wherein

said means for purifying comprises

means for replicating the first driver of the net the replicating creating the second driver driving the second net.

21. The data processing system of claim 19, wherein said means for purifying comprises means for locating an existing replication of the first driver of the net;

and

means for configuring the existing replication of the first driver element to drive the second net.