Configurable logic element with expander structures

Details Configurable logic element with expander structures Configurable logic element with expander structures

2007-07-24

2007-07-24

Tran, Anh Q. (Department: 2819)

Electronic digital logic circuitry

Multifunctional or programmable

Array

C326S039000, C326S047000

Reexamination Certificate

active

11585534

ABSTRACT:
A configurable logic element (CLE) for a field programmable gate array (FPGA) includes “expanders”, i.e., connectors that allow fast signal communication between logic blocks. Expanders allow the configurable interconnection of a plurality of logic blocks, or portions thereof, to form a single logical entity that can implement large user circuits such as PALs, lookup tables, multiplexers, tristate buffers, and memories. One embodiment includes a configurable logic block. In a first mode, the logic block provides two N-input LUTs having N shared inputs and two separate outputs. The outputs are then combined using an expander to generate an (N+1)-input function. In a second mode, the logic block provides two N-input LUTs having M unshared inputs. An optional third mode provides a plurality of product term output signals based on the values of the N input signals.

REFERENCES:
patent: 5362999 (1994-11-01), Chiang
patent: 5432719 (1995-07-01), Freeman et al.
patent: 5473266 (1995-12-01), Ahanin et al.
patent: 5473267 (1995-12-01), Stansfield
patent: 5801547 (1998-09-01), Kean
patent: 5815726 (1998-09-01), Cliff
patent: 5828229 (1998-10-01), Cliff et al.
patent: 5936424 (1999-08-01), Young et al.
patent: 6020759 (2000-02-01), Heile
patent: 6107822 (2000-08-01), Mendel et al.
patent: 6144573 (2000-11-01), Heile
patent: 6150838 (2000-11-01), Wittig et al.
patent: 6288970 (2001-09-01), Reddy et al.
patent: 6480025 (2002-11-01), Altaf
patent: 6747480 (2004-06-01), Kaptanoglu et al.
patent: 6847229 (2005-01-01), New et al.
patent: 6873182 (2005-03-01), Mohan et al.
patent: 913 944 (1999-05-01), None
Xilinx, Inc.; “Virtex-II Platform FPGA Handbook”; published Dec. 2000; available from Xilinx, Inc., 2100 Logic Drive, San Jose, California 95124; pp. 46-54.
Xilinx, Inc,; “The Programmable Logic Data Book” Sep. 1996; available from Xilinx, Inc. 2100 Logic Drive, San Jose, California 95124; pp. 4-11 to 4-20 and 4-294 to 4-296.
Xilinx, Inc.; “The Programmable Logic Data Book” 2000; published Apr. 200; available from Xilinx, Inc. 2100 Logic Drive, San Jose, California 95124; pp. 3-9 to 3-11 and 3-79 to 3-82, Apr. 2000.
Wilton, Steve J. E.; “SMAP: Heterogenous Technology Mapping for Area Reduction in FPGAs with Embedded Memory Arrays”, published Feb. 1998; ACM/SIGDA International Symposium on Field-Programmable Gate Arrays.

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