Bus-based logic blocks with optional constant input

Details Bus-based logic blocks with optional constant input Bus-based logic blocks with optional constant input

2011-07-19

2011-07-19

Cho, James H. (Department: 2819)

Electronic digital logic circuitry

Multifunctional or programmable

Having details of setting or programming of interconnections...

C326S041000, C326S047000, C326S093000, C708S505000, C708S523000

Reexamination Certificate

active

07982496

ABSTRACT:
A bus-based logic block for an integrated circuit includes a provision for placing an arbitrary constant onto a data bus in the logic block. An exemplary logic block has multi-bit first and second inputs and a multi-bit output. The logic block includes a multi-bit multiplexer circuit, a multi-bit programmable logic circuit, and a constant generator circuit. The multiplexer circuit has a multi-bit first input coupled to a multi-bit first input of the logic block, a multi-bit second input, and a multi-bit output. The programmable logic circuit has a multi-bit first input coupled to the output of the multiplexer circuit, and a multi-bit output. The constant generator circuit has a multi-bit output coupled to the second input of the multiplexer circuit. Each bit of the logic block may be commonly controlled with all other bits of the logic block.

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