Configurable circuits, IC's and systems

• US 7,616,027 B2
• Filed: 12/28/2006
• Issued: 11/10/2009
• Est. Priority Date: 02/14/2004
• 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, Butts, Michael, Hutchings, Brad L., Teig, Steven
• Primary Examiner(s): Tan, Vibol
• Assistant Examiner(s): WHITE, DYLAN C
• Application Number:
  US11/617,671
• Publication Number:
  US 20070241777A1
• Time in Patent Office: 1,048 Days
• Field of Search: 326 37- 41, 326/47
• US Class Current: 326/47
• CPC Class Codes: H03K 19/1737 using multiplexers H03K19/1738 takes precedence
• CPC Class Codes: H03K 19/17736 Structural details of routing resources
• CPC Class Codes: H03K 19/17752 for hot reconfiguration
• CPC Class Codes: H03K 19/17756 for partial configuration or partial reconfiguration

Abstract

Some embodiments of the invention provide a configurable integrated circuit (IC). The configurable IC includes first and second interconnect circuits. The first interconnect circuit has a set of input terminals, a set of output terminals, and several connection schemes for communicatively coupling the input terminal set to the output terminal set. During the operation of the IC, the second connection circuit supplies sets of configuration data to the first interconnect circuit at a particular rate for at least a particular time period. At least two supplied configuration data sets are different and configure the first interconnect circuit to use two different connection schemes that differently couple the input and output terminal sets.

Claims

1. An integrated circuit (IC) comprising:

a) a first interconnect circuit comprising a set of input terminals, a set of output terminals, and a plurality of connection schemes for communicatively coupling the input terminal set to the output terminal set;

b) a second connection circuit for supplying sets of configuration data to the first interconnect circuit, the second connection circuit for receiving a multi-bit periodic control signal that directs the second connection circuit to supply configuration data sets to the first interconnect circuit, the multi-bit periodic control signal having a particular rate for at least a particular time period during an operation of the IC; and

c) a signal generator for producing said multi-bit periodic control signal from a periodic clock signal.

2. The IC of claim 1, wherein the first interconnect circuit is a multiplexer.

3. The IC of claim 1, wherein the first interconnect circuit is a decoder.

4. The IC of claim 1, wherein the periodic control signal is a clock signal.

5. The IC of claim 1, wherein the second connection circuit includes a plurality of sub-circuits, each sub-circuit for storing configuration data sets and for supplying subsets of said configuration data sets to the first interconnect circuit at the particular rate.

6. A method of reconfiguring a configurable interconnect circuit of an integrated circuit (IC), the method comprising:

receiving a plurality of configuration data sets at a connection circuit;

receiving a clock signal;

based on the received clock signal, generating a multi-bit periodic control signal;

receiving the multi-bit periodic control signal at the connection circuit, wherein the multi-bit periodic control signal changes between at least two values at a particular rate and the values of the multi-bit periodic control signal repeat at intervals of equal duration; and

based on the received multi-bit periodic control signal, supplying at least two configuration data sets to the configurable interconnect circuit, wherein the supplied configuration data sets reconfigure the configurable interconnect circuit to use at least two different connection schemes that differently couple a set of input and output terminals of the configurable interconnect circuit.

7. The method of claim 6, wherein the periodic control signal is a clock signal.

8. The method of claim 6, wherein said particular rate is faster than a configuration rate of the configurable interconnect circuit.

9. The method of claim 6, wherein said particular rate is equal to a configuration rate of the configurable interconnect circuit.

10. A configurable interconnect circuit for an integrated circuit (IC), the configurable interconnect circuit comprising:

a set of input terminals;

a set of output terminals; and

a set of control lines for receiving a multi-bit periodic control signal and for causing the configurable interconnect circuit to configurably couple the set of input terminals to the set of output terminals at a first rate for at least a first time period, the multi-bit periodic control signal for changing between at least two values at a second rate for at least a second time period during an operation of the IC, wherein the values of the multi-bit periodic control signal repeat at intervals of equal duration and are derived from a periodic clock signal.

11. The configurable interconnect circuit of claim 10, wherein the first and second rates are equal.

12. The configurable interconnect circuit of claim 10, wherein the first and second time periods are equal.

13. An electronics system comprising:

a memory for storing configuration data; and

an integrated circuit (IC) comprising;

a first interconnect circuit comprising a set of input terminals, a set of output terminals, and a plurality of connection schemes for communicatively coupling the input terminal set to the output terminal set;

a second connection circuit for supplying sets of configuration data to the first interconnect circuit, the second connection circuit for receiving a multi-bit periodic control signal that directs the second connection circuit to supply configuration data sets to the first interconnect circuit, the multi-bit periodic control signal having a particular rate for at least a particular time period during an operation of the IC; and

a signal generator for producing said multi-bit periodic control signal from a periodic clock signal.

14. The electronic system of claim 13 further comprising a non-volatile memory for storing configuration data sets and for supplying configuration data sets to the configurable IC when the configurable IC powers up.

15. The electronic system of claim 14, wherein said supplied configuration data sets are simultaneously stored in the IC.

16. The electronic system of claim 13, wherein the IC further comprises a storage for storing configuration data sets, wherein the second connection circuit communicatively couples to the first interconnect circuit and to the storage to supply subsets of configuration data sets stored in the storage to the first interconnect circuit.

17. The electronic system of claim 16, wherein the storage comprises memory cells.

18. The electronic system of claim 17, wherein the memory cells are read-writeable memory cells.