Configurable logic circuits with commutative properties

• US 7,439,766 B2
• Filed: 09/25/2006
• Issued: 10/21/2008
• Est. Priority Date: 06/30/2004
• Status: Expired due to Fees

• Current Assignee: Tahoe Research Limited (f/k/a Learndale Limited) (Vector Capital Corporation)
• Original Assignee: Tabula Incorporated
• Inventors: Schmit, Herman, Teig, Steven
• Primary Examiner(s): CHANG, DANIEL D
• Application Number:
  US11/535,058
• Publication Number:
  US 20070241776A1
• Time in Patent Office: 757 Days
• Field of Search: 326 37- 41, 326/46, 326/47
• US Class Current: 326/38
• CPC Class Codes: H03K 19/1737 using multiplexers H03K19/1738 takes precedence
• CPC Class Codes: H03K 19/17756 for partial configuration or partial reconfiguration

Abstract

Some embodiments of the invention provide a configurable logic circuit. The logic circuits has inputs for receiving input data. It also has a first connecting circuit for receiving configuration data and at least a portion of the input data. Based at least partially on the received portion of the input data, the first connecting circuit selects configuration data sub-sets. The logic circuit also includes a second core-logic circuit for receiving configuration data sub-sets from the first connecting circuit and for providing the output data. At least two configuration data sub-sets configure the configurable logic circuit to perform at least two different functions on the input data to produce output data.

Claims

1. A configurable logic circuit for receiving input data on which the logic circuit configurably performs one of a plurality of operations to produce output data, the logic circuit comprising:

a first connecting circuit for selecting a configuration data set at least partially based on a portion of the input data; and

a second core-logic circuit for receiving the configuration data set from the first connecting circuit and for receiving at least a portion of a configuration signal, the second circuit for producing output data based on the received configuration data set.

2. The configurable logic circuit of claim 1, wherein the second core-logic circuit receives all of the configuration signal.

3. The configurable logic circuit of claim 1, wherein the first connecting circuit receives all of the input data.

4. The configurable logic circuit of claim 1, wherein the first and second circuits are multiplexers.

5. The configurable logic circuit of claim 1, wherein the first circuit includes a set of multiplexers and the second circuit includes a set of multiplexers, wherein each multiplexer receives input signals and select data and provides an output by selecting a sub-set of its input signals based on the received select data.

6. The configurable logic circuit of claim 5, wherein each first-circuit multiplexer receives input data as select data, and each second-circuit multiplexer receives the configuration signal as select data.

7. The configurable logic circuit of claim 1, wherein the first connecting circuit receives at least a portion of the configuration signal.

8. The configurable logic circuit of claim 1, wherein the second core-logic circuit receives at least a portion of the input data.

9. The configurable logic circuit of claim 1, wherein the configuration signal is a periodic signal.

10. The configurable logic circuit of claim 9, wherein the periodic signal is a clock signal.

11. The configurable logic circuit of claim 1, wherein the configuration signal is a control signal.

12. A configurable logic circuit (“

IC”

) comprising inputs for receiving input data, the logic circuit comprising;

a first connecting circuit for receiving configuration data and a periodic signal, and for sequentially selecting configuration data sub-sets based on the received periodic signal; and

a second circuit for receiving configuration data sub-sets from the first connecting circuit and for providing output data;

wherein at least two configuration data sub-sets configure the configurable circuit to perform at least two different operations on the input data to produce the output data.

13. The configurable IC of claim 12, wherein the second circuit is a configurable logic circuit.

14. The configurable IC of claim 12, wherein the second circuit is a configurable interconnect circuit.

15. A configurable integrated circuit (“

IC”

) for receiving a configuration signal and for receiving input data on which the integrated circuit configurably performs one of a plurality of operations to produce output data, the integrated circuit comprising;

a plurality of storage circuits, wherein during a particular period in the operation of the IC each storage circuit repetitively receives and stores configuration data from a previous storage circuit and passes configuration data to a next storage circuit; and

a second configurable circuit for receiving configuration data sets from one of said storage circuits and for configurably performing an operation based on the received configuration data set.

16. The configurable IC of claim 15, wherein the second circuit is a configurable logic circuit.

17. The configurable IC of claim 15, wherein the second circuit is a configurable interconnect circuit.

18. The configurable IC of claim 15, wherein the IC is a single integrated circuit chip.