Dedicated logic cells employing configurable logic and...

Details Dedicated logic cells employing configurable logic and... Dedicated logic cells employing configurable logic and...

2006-10-09

2008-10-21

Cho, James H (Department: 2819)

Electronic digital logic circuitry

Multifunctional or programmable

Array

C326S046000

Reexamination Certificate

active

07439768

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 some embodiments, the configurable logic function comprises a plurality of look-up tables coupled to a multiplexer with configurable bits that is capable to perform a four 4-input look-up table, one 6-input look-up tables or a 4-to-1 multiplexer. In the first function that operates as the four 4-input look-up table, the dedicated logic cell has four look-up tables for receiving four inputs respectively. In the second function that operates as one 6-input look-up table, a fifth input from a multiplexer and a sixth input from a multiplexer are added to the four inputs. In the third function that operates as a 4-to-1 multiplexer, a multiplexer receives four inputs respectively from the four look-up tables with two select lines.

REFERENCES:
patent: 6107827 (2000-08-01), Young et al.
patent: 6191611 (2001-02-01), Altaf
patent: 6943580 (2005-09-01), Lewis et al.

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