Configurable IC with large carry chains
First Claim
Patent Images
1. A configurable integrated circuit (“
- IC”
) comprising;
a plurality of sets of circuits, each set of circuits for performing an addition or subtraction operation,each set of circuits comprising (i) at least one circuit for producing a propagate signal and a generate signal and (ii) at least one carry circuit for producing a carry signal,wherein the carry circuit of at least one set of circuits is arranged adjacent to the carry circuits of at least three other sets of circuits to reduce propagation delay of the carry signal from one set of circuits to another set of circuits.
3 Assignments
0 Petitions
Accused Products
Abstract
Some embodiments provide a configurable IC that includes several configurable logic circuits, where the logic circuits include several sets of associated configurable logic circuits. For each several sets of associated configurable logic circuits, the reconfigurable IC also includes a carry circuit for performing up to N carry operations sequentially, wherein N is greater than two.
-
Citations
23 Claims
-
1. A configurable integrated circuit (“
- IC”
) comprising;a plurality of sets of circuits, each set of circuits for performing an addition or subtraction operation, each set of circuits comprising (i) at least one circuit for producing a propagate signal and a generate signal and (ii) at least one carry circuit for producing a carry signal, wherein the carry circuit of at least one set of circuits is arranged adjacent to the carry circuits of at least three other sets of circuits to reduce propagation delay of the carry signal from one set of circuits to another set of circuits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- IC”
-
11. An electronic device comprising:
a configurable integrated circuit (“
IC”
) comprising;a plurality of sets of circuits, each set of circuits for performing an addition or subtraction operation, each set of circuits comprising (i) at least one circuit for producing a propagate signal and a generate signal and (ii) at least one carry circuit for producing a carry signal, wherein the carry circuit of at least one set of circuits is arranged adjacent to the carry circuits of at least three other sets of circuits to reduce propagation delay of the carry signal from one set of circuits to another set of circuits. - View Dependent Claims (12, 13, 14, 15, 16)
-
17. An integrated circuit (“
- IC”
) comprising;a) a first set of tiles aligned according to a first arrangement, each tile in the first set of tiles comprising a configurable logic circuit and a carry circuit, wherein the first arrangement orients each tile in the first set of tiles such that each of the carry circuits of the first set of tiles borders at least three other carry circuits in the first set of tiles; and b) a second set of tiles aligned according to a second arrangement, each tile in the second set of tiles comprising a configurable logic circuit and a carry circuit, wherein the second arrangement orients each tile in the second set of tiles such that at least one of the carry circuits of the second set of tiles borders at least three other carry circuits in the second set of tiles, wherein said first arrangement of configurable logic circuits and carry circuits performs a fast M-bit addition or subtraction operation and said second arrangement of configurable logic circuits and carry circuits performs a fast N-bit addition or subtraction operation, and wherein an output of a carry circuit of the first set of tiles is supplied as an input to a carry circuit of the second set of tiles in order to perform an N+M-bit addition or subtraction operation. - View Dependent Claims (18, 19, 20, 21, 22, 23)
- IC”
Specification