Dynamic power-down of a block of a pattern-recognition processor

1. A device, comprising:

a data source comprising data to be analyzed; and

a pattern-recognition processor coupled to the data source, wherein the pattern-recognition processor receives data to be analyzed from the data source when the pattern-recognition processor is in operation, the pattern-recognition processor comprising:

a plurality of blocks, each block of the plurality of blocks comprising:

a plurality of feature cells configured to analyze at least a portion of the data to be analyzed and to selectively provide a result of the analysis; and

block deactivation logic associated with only the plurality of feature cells of the block and configured to determine whether any of the feature cells of the block are active in the analysis and to dynamically power-down the block when the block deactivation logic determines that none of the feature cells of the block are active in the analysis, wherein the pattern-recognition processor comprises an activation-routing matrix coupled to the block deactivation logic, wherein the activation-routing matrix is configured to transmit an indication of whether any of the plurality of feature cells of the block are active in the analysis.

2. The device of claim 1 , wherein the block deactivation logic is configured to receive an indication of whether any of the plurality of feature cells of the block are active in the analysis.

3. The device of claim 2 , wherein the block deactivation logic is configured to dynamically power-down the block based at least in part on the indication of whether any of the plurality of feature cells are active in the analysis.

4. The device of claim 1 , wherein the block deactivation logic comprises a memory cell configured to receive an indication of whether any of the plurality of feature cells of the block are active in the analysis.

5. The device of claim 4 , wherein the block deactivation logic is configured to dynamically power-down the block based at least in part on a value stored in the memory cell.

6. The device of claim 1 , wherein the block deactivation logic circuit comprises a plurality of AND gates each having an output terminal coupled to a respective local input conductor, wherein each respective local input conductor is coupled to one of the blocks.

7. The device of claim 6 , wherein the plurality of AND gates each have an input terminal coupled to a respective global input conductor, wherein each respective global input conductor is coupled to at least two of the blocks.

8. The device of claim 6 , wherein the block deactivation logic circuit comprises an OR gate, wherein the plurality of AND gates each have an input terminal coupled to an output terminal of the OR gate.

9. The device of claim 8 , wherein each of the blocks comprise a detection cell, wherein the OR gate has an input terminal coupled to the detection cell.

10. The device of claim 9 , wherein the detection cell is configured to output a value indicative of whether one of the plurality of feature cells of the block is active in the analysis.

11. The device of claim 1 , wherein the block deactivation logic is configured to dynamically power-down the block based at least in part on the indication of whether any of the plurality of feature cells of the block are active in the analysis.

12. A pattern-recognition processor, comprising:

an input coupled to a data source, wherein the input receives data to be analyzed when the pattern-recognition processor is in operation;

a first block of first feature cells configured to analyze at least a portion of the data to be analyzed and to provide a result of the analysis;

a second block of second feature cells configured to analyze at least a second portion of the data to be analyzed and to provide a second result of the analysis;

block deactivation logic coupled to the first block of feature cells and corresponding only to the first block of feature cells and configured to determine whether any of the feature cells of the first block are active in the analysis and to dynamically power-down the first block when the block deactivation logic determines that none of the feature cells of the first block are active; and

an activation-routing matrix coupled to the block deactivation logic, wherein the activation-routing matrix is configured to transmit an indication of whether any of the first feature cells of the first block are active in the analysis.

13. The pattern-recognition processor of claim 12 , wherein the block deactivation logic is configured to receive the indication of whether any of the first feature cells of the first block are active in the analysis and dynamically power-down the first block based at least in part on the indication of whether any of the first feature cells are active in the analysis.

14. The pattern-recognition processor of claim 13 , wherein the block deactivation logic comprises memory configured to store the indication of whether any of the first feature cells of the first block are active in the analysis.

15. The pattern-recognition processor of claim 12 , comprising a second block deactivation logic coupled to the second block of feature cells and only corresponding to the second block of feature cells and configured to dynamically power-down the second block.

16. The pattern-recognition processor of claim 15 , wherein the activation-routing matrix is coupled to the second block deactivation logic, wherein the activation-routing matrix is configured to transmit an indication of whether any of the second feature cells of the second block are active in the analysis.

17. The pattern-recognition processor of claim 16 , wherein the second block deactivation logic is configured to receive the indication of whether any of the second feature cells of the second block are active in the analysis and dynamically power-down the second block based at least in part on the indication of whether any of the second feature cells are active in the analysis.

18. The pattern-recognition processor of claim 16 , wherein the second block deactivation logic comprises memory configured to store the indication of whether any of the second feature cells of the second block are active in the analysis.

19. A method, comprising:

receiving data to be analyzed by at least one of a first block of feature cells and a second block of feature cells;

transmit by an active routing matrix coupled to a block deactivation logic, an indication of whether any of the feature cells of the block are active in the analysis;

determining via block deactivation logic coupled to the first block of feature cells and corresponding only to the first block of feature cells if any feature cells in the first block of feature cells are active in the analysis of the data; and

transmitting a block deactivation signal from the block deactivation logic to power-down the first block if none of the feature cells of the first block of feature cells are active in the analysis of the data.

20. The method of claim 19 , wherein determining whether any of the feature cells of the first block of feature cells are active in the analysis of the data comprises outputting a signal from an OR gate coupled to each of the feature cells of the first block of feature cells.

21. The method of claim 19 , wherein determining whether any of the feature cells of the first block of feature cells are active in the analysis of the data comprises outputting a value stored by a memory cell in the block deactivation logic, wherein the value is indicative of whether any of the feature cells of the first block of feature cells are active in the analysis of the data.

22. The method of claim 19 , comprising:

determining via the block deactivation logic if any of the feature cells of the second block of feature cells are active in the analysis of the data; and

transmitting a second block deactivation signal from the block deactivation logic to power-down the second block of feature cells if none of the feature cells of the second block of feature cells are active in the analysis of the data.

23. The method of claim 19 , comprising searching the data via the first block of feature cells or the second block of feature cells according to search criteria.