Logic block for programmable logic devices

Details Logic block for programmable logic devices Logic block for programmable logic devices

1991-08-08

1992-07-07

Hudspeth, David

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

36518908, H03K 19177

Patent

active

051285592

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 changed except by reprogramming the device.

REFERENCES:
patent: 4293783 (1981-10-01), Patil
patent: 4524430 (1985-06-01), Page
patent: 4642487 (1987-02-01), Carter
patent: 4754160 (1988-06-01), Ely
patent: 4975601 (1990-12-01), Steele

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