Storage elements for a configurable IC and method and apparatus for accessing data stored in the storage elements

• US 7,570,077 B2
• Filed: 12/21/2007
• Issued: 08/04/2009
• Est. Priority Date: 11/08/2004
• Status: Expired due to Fees

• Current Assignee: Altera Corporation (Intel Corporation)
• Original Assignee: Tabula Incorporated
• Inventors: Redgrave, Jason
• Primary Examiner(s): Tan, Vibol
• Assistant Examiner(s): Crawford, Jason
• Application Number:
  US11/963,771
• Publication Number:
  US 20080164906A1
• Time in Patent Office: 592 Days
• Field of Search: 326 37- 41, 326/47, 36518902-18903, 36523002-23003, 327 51- 57
• US Class Current: 326/38
• CPC Class Codes: H03K 19/17736 Structural details of routing resources
• CPC Class Codes: H03K 19/1776 for memories

Abstract

Some embodiments provide a circuit for accessing stored data in a configurable IC that includes several configurable circuits. The IC also includes several storage circuits. Each storage circuit has (1) several storage elements for storing data for the configurable circuits, and (2) output circuitry for outputting data stored in the storage elements. The output circuitry includes a first set of interconnects for receiving at least a first repeating periodic signal and for periodically outputting data from at least two storage elements to the configurable circuits.

Claims

1. An integrated circuit (IC) comprising:

a plurality of configurable circuits for configurably performing operations based on configuration data; and

a plurality of storage circuits, each particular storage circuit comprising;

(i) a stacked array of storage elements storing configuration data,

(ii) a set of sense amplifiers for reading the configuration data stored in the stacked array of storage elements, and

(iii) a set of interconnect circuits for selectively outputting configuration data read from a particular set of the storage elements to at least one configurable circuit based on a repeating periodic signal.

2. The IC of claim 1, wherein the stacked array comprises a row-column arrangement of the storage elements.

3. The IC of claim 2, wherein the configuration data of the particular set of the storage elements comprises configuration data of a row of storage elements within the stacked array.

4. The IC of claim 2, wherein the set of interconnect circuits are a first set of interconnect circuits, each particular storage circuit further comprising a second set of interconnect circuits arranged according to the row-column arrangement of the storage elements, wherein the second set of interconnect circuits periodically selects sets of data from the plurality of storage elements to be read by the sense amplifiers.

5. The IC of claim 4, wherein the repeating periodic signal is a first periodic signal, wherein the second set of interconnect circuits periodically selects sets of data from the plurality of storage elements to supply to the set of sense amplifiers based on a second periodic signal.

6. The IC of claim 5, wherein at least two interconnect circuits of the second set of interconnect circuits receive the second periodic signal with the same frequency but a different phase offset.

7. The IC of claim 1, wherein each storage element stores the configuration data at a reduced voltage that is less than an operating voltage of the IC, wherein the set of sense amplifiers level convert the reduced voltage to the operating voltage of the IC before outputting said configuration data to the at least one configurable circuit.

8. A method comprising:

storing configuration data for at least one particular configurable circuit of an integrated circuit (IC) within a plurality of storage elements of a particular storage circuit;

periodically selecting sets of configuration data from the plurality of storage elements to output from the particular storage circuit based on a repeating periodic signal; and

passing the periodically selected configuration data through a sense amplifier before passing said configuration data to configure the particular configurable circuit of the integrated circuit (IC).

9. The method of claim 8, wherein the particular storage circuit comprises a set of interconnect circuits associated with the plurality of storage elements, the method further comprising receiving the repeating periodic signal at the interconnect circuits, said repeating periodic signal for alternatively enabling particular interconnect circuits to output configuration data from associated storage elements.

10. The method of claim 8, wherein the particular storage circuit comprises an output circuit for receiving the repeating periodic signal and for receiving configuration data from at least two storage elements, the method further comprising:

from the output circuit, outputting a particular configuration data from the configuration data of the at least two storage elements based on the repeating periodic signal.

11. The method of claim 8 further comprising:

amplifying signals of the configuration data using the sense amplifier before passing said configuration data to the particular configurable circuit.

12. The method of claim 8, wherein passing said configuration data comprises receiving the periodically selected sets of configuration data at a reduced voltage that is less than the operating voltage of the IC and passing the configuration data at a voltage that is the operating voltage of the IC.

13. An integrated circuit (IC) comprising:

a plurality of configurable circuits for configurably performing operations; and

a plurality of storage circuits, each storage circuit comprising (i) a plurality of storage elements for storing data, (ii) a set of interconnect circuits for periodically selecting sets of data from the plurality of storage elements based on a repeating periodic signal, and (iii) a set of sensing circuits for sensing the periodically selected sets of data before passing said data to facilitate operations of at least one configurable circuit.

14. The IC of claim 13, wherein the data stored within the storage elements comprises configuration data for configuring the configurable circuit to perform a set of logic computations.

15. The IC of claim 13, wherein the data stored within the storage elements comprises data used by the configurable circuit.

16. The IC of claim 13, wherein the repeating periodic signal is a first periodic signal, wherein each storage circuit further comprises an output circuit for outputting the sensed data to the configurable circuit based on a second periodic signal that is faster than the first periodic signal.

17. The IC of claim 16, wherein the first periodic signal operates at a first rate, the second periodic signal operates at a second rate that is faster than the first rate, and the output circuit outputs configuration data at a third rate that is faster than the first and second rates.

18. The IC of claim 13, wherein each set of sensing circuits comprises a pair of cross coupled transistors.

19. An electronic device comprising:

an integrated circuit (IC) comprising;

a plurality of configurable circuits for configurably performing operations based on configuration data; and

a plurality of storage circuits, each particular storage circuit comprising;

(i) a stacked array of storage elements storing configuration data,

(ii) a set of sense amplifiers for reading the configuration data stored in the stacked array of storage elements, and

(iii) a set of interconnect circuits for selectively outputting configuration data read from a particular set of the storage elements to at least one configurable circuit based on a repeating periodic signal.

20. The electronic device of claim 19, wherein the stacked array comprises a row-column arrangement of the storage elements.

21. The electronic device of claim 20, wherein the set of interconnect circuits is a first set of interconnect circuits, each particular storage circuit further comprising a second set of interconnect circuits that are arranged according to the row-column arrangement of the storage elements.

22. The electronic device of claim 21, wherein the repeating periodic signal is a first repeating periodic signal, wherein the second set of interconnect circuits periodically selects sets of data from the plurality of storage elements to supply to the set of sense amplifiers based on a second repeating periodic signal.

23. An electronic device comprising:

an integrated circuit (IC) comprising;

a plurality of configurable circuits for configurably performing operations; and

a plurality of storage circuits, each storage circuit comprising (i) a plurality of storage elements for storing configuration data, (ii) a set of interconnect circuits for periodically selecting sets of configuration data from the plurality of storage elements based on a repeating periodic signal, and (iii) a set of sensing circuits for sensing the periodically selected sets of configuration data before passing said data to facilitate operations of at least one configurable circuit.

24. The electronic device of claim 23, wherein the repeating periodic signal is a first periodic signal, wherein each storage circuit further comprises an output circuit for outputting the sensed data to the configurable circuit based on a second periodic signal that is faster than the first periodic signal.