Circuit block for programmable logic devices, configurable as a

Details Circuit block for programmable logic devices, configurable as a Circuit block for programmable logic devices, configurable as a

1990-08-30

1992-03-24

Hudspeth, David

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307469, 36518908, H03K 1920

Patent

active

050991507

ABSTRACT:
A standard logic block, or macrocell, is provided for use on programmable logic devices. The macrocell uses RAM to perform logic functions, and further includes circuitry which allows writing of data to the RAM during use. Each logic block can be configured at programming time to be either a user RAM, allowing the user to write data to such memory during use, or configured as performing logic functions. The contents of macrocells configured as providing logic functions cannot be charged except by reprogramming the device.

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patent: 4642487 (1987-02-01), Carter
patent: 4727268 (1988-02-01), Hori
patent: 4754160 (1988-06-01), Ely
patent: 4780846 (1988-10-01), Tanabe et al.
patent: 4791602 (1988-12-01), Resnick
patent: 4855958 (1989-08-01), Ikeda

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