Electronic digital logic circuitry – Multifunctional or programmable – Array
Patent
1998-03-03
2000-02-01
Santamauro, Jon
Electronic digital logic circuitry
Multifunctional or programmable
Array
326 37, H03K 19177
Patent
active
060207566
ABSTRACT:
A configurable logic block (CLB) which includes a function generator, carry logic and a first multiplexer. To operate the CLB as a multiplier, the function generator and the carry logic are each coupled to receive a first multiplier bit, a second multiplier bit and a carry signal. The function generator and carry logic are configured to provide a sum signal and a carry signal, respectively, in response to these input signals. The first multiplexer is coupled to receive the sum signal, the first multiplier bit, the second multiplier bit and a logic zero signal. The first multiplexer is controlled to pass a selected one of these signals in response to a first multiplicand bit and a second multiplicand bit. As a result, the CLB effectively creates and adds the partial products which result from multiplying the first and second multiplier bits and the first and second multiplicand bits. The carry logic takes into account the carry result from a less significant position and provides a carry result to a more significant position. The CLB can also operate as a relatively large multiplexer. In the multiplexer mode, the function generator is effectively bypassed in favor of the first multiplexer, which provides a larger multiplexing function than that normally available from the function generator. In another mode, the first multiplexer is effectively bypassed, such that the CLB operates as a conventional CLB.
REFERENCES:
patent: 5894565 (1999-04-01), Furtek et al.
patent: 5942913 (1999-08-01), Young et al.
"The Programmable Logic Data Book" copyright 1994, pp. 2-5 to 2-102 and 8-105 to 8-115, Xilinx, Inc., 2100 Logic Drive, San Jose, CA 95124.
Hoffman E. Eric
Santamauro Jon
Xilinx , Inc.
Young Edel M.
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