Swap MUX to relieve logic device input line stress

Details Swap MUX to relieve logic device input line stress Swap MUX to relieve logic device input line stress

2007-07-24

2007-07-24

Cho, James H. (Department: 2819)

Electronic digital logic circuitry

Multifunctional or programmable

Array

C326S047000

Reexamination Certificate

active

10777603

ABSTRACT:
Disclosed is a method an apparatus for selectively providing additional inputs into a logic block, such as a LAB of a PLD, carrying out a logic function requiring a relatively high number of inputs. A PLD in accordance with the present invention includes at least first and second LABs. A plurality of signal lines are capable of driving the second LAB and a plurality of output lines are driven by the first LAB. The PLD also includes a swap multiplexer (MUX) having a first selectable input capable of being driven by the output lines and a second selectable input capable of being driven by the signal lines. An output of the swap MUX is capable of driving the first LAB.

REFERENCES:
patent: 6184710 (2001-02-01), Mendel
patent: 6492834 (2002-12-01), Lytle et al.
patent: 6614261 (2003-09-01), Ngai et al.

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