Mask-programmable logic device with programmable...

Details Mask-programmable logic device with programmable... Mask-programmable logic device with programmable...

2007-12-04

2007-12-04

Barnie, Rexford (Department: 2819)

Electronic digital logic circuitry

Multifunctional or programmable

Having details of setting or programming of interconnections...

C326S037000, C326S047000, C326S101000

Reexamination Certificate

active

11117588

ABSTRACT:
A mask-programmable logic device includes a macrocell having an external input/output port for “place-and-route” programming by addition of metallization layers. A programmable “fixed” layer allows the external input/output port to be isolated from the remainder of the macrocell so that it “floats,” allowing signals to be routed through the external input/output port when the macrocell is not in use, to reduce routing blockages. The macrocell also may have at least one internal input/output port, potentially connected to different logic circuits, and a programmable “fixed” layer that can be used to control which internal input/output port is connected to the external input/output port. By thus allowing multiple logic circuits to share a single external input/output port, routing blockages are reduced.

REFERENCES:
patent: 5656548 (1997-08-01), Zavracky et al.
patent: 5742181 (1998-04-01), Rush
patent: 6222212 (2001-04-01), Lee et al.
patent: 6331790 (2001-12-01), Or-Bach et al.
patent: 7084666 (2006-08-01), Madurawe

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