Flexible macrocell interconnect

Details Flexible macrocell interconnect Flexible macrocell interconnect

2007-01-09

2007-01-09

Cho, James H. (Department: 2819)

Electronic digital logic circuitry

Multifunctional or programmable

Array

C326S047000

Reexamination Certificate

active

11180069

ABSTRACT:
Methods and apparatus for novel routing structures and methods that improve fitting of user-defined functions onto programmable logic devices. In particular, second time fitting is improved. Exemplary structures and methods include allowing product terms to be expanded using inputs from more than one neighboring macrocell by providing multiple expansion and bypassing paths. Also, product term OR shifting prevents macrocell output stages from being buried and made inaccessible, and macrocell outputs are provided on expander word lines, increasing efficiency of those lines, as well as conserving routing resources. Expansion, bypassing, OR shifting, and expander word lines may terminate at logic array block boundaries or may continue beyond these boundaries to other logic array blocks.

REFERENCES:
patent: 5869981 (1999-02-01), Agrawal et al.
patent: 5952846 (1999-09-01), Silver
patent: 6084447 (2000-07-01), Graf, III

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