Dedicated logic cells employing sequential logic and control...

Details Dedicated logic cells employing sequential logic and control... Dedicated logic cells employing sequential logic and control...

2008-05-06

2008-05-06

Cho, James H (Department: 2819)

Electronic digital logic circuitry

Multifunctional or programmable

Array

C326S047000

Reexamination Certificate

active

07368941

ABSTRACT:
A dedicated logic cell in a programmable logic structure is described that comprises the following primary components: a configurable logic function or look-up table (LL), a dedicated logic function (DL), a sequential logic function (LS), and a control logic function (LC). In this illustration, the dedicated logic cell comprises two configurable logic functions, two sequential logic functions, a dedicate logic function, and a control logic function. In a first embodiment, the dedicated logic cell is constructed with a combination of configurable logic functions that are coupled to a dedicated logic function in order to perform a four 2-input function, an AND function, an OR function, or an XOR function. In a second embodiment, the dedicated logic cell is constructed with a combination of configurable logic functions that are coupled to a dedicated logic function in order to perform a four 2-to-1 multiplexer function. In a third embodiment, the dedicated logic cell is constructed with a plurality of configurable logic functions that operate as a two 6-input function with separate inputs. In a fourth embodiment, the dedicated logic cell is constructed with a combination of a configurable logic function with sequential logic functions that operate as a loadable, resettable, clearable shift register. In a fifth embodiment, the dedicated logic cell is constructed with a combination of configurable logic functions, a dedicated logic function, and sequential logic functions that operate as an accumulator.

REFERENCES:
patent: 5943490 (1999-08-01), Sample
patent: 6288570 (2001-09-01), New
patent: 6998872 (2006-02-01), Chirania et al.

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