Programmable logic device

Details Programmable logic device Programmable logic device

1992-03-26

1994-08-16

Westin, Edward P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307469, 307473, H03K 19173

Patent

active

053389824

ABSTRACT:
A semiconductor integrated circuit capable of electrically writing functions according to this invention comprises a plurality of logical blocks capable of electrically writing functions and wire elements capable of programmably connecting the logical blocks to each other. Each of the logical blocks includes a gate element as an output buffer having a control terminal. The gate element assumes a high impedance state when inputting a control signal to the control terminal. An output of the logical block is thereby made unable; or the respective logical blocks are directly wired-connectable to effect logical sum outputting. Alternatively, the gate element assumes two output states of an open drain output and a totem-pole output. Hence, in the semiconductor integrated circuit of this invention, it is possible to improve a gate using efficiency of the small-sized programmable logical blocks and attain a high-density and high-integrated programmable logic device.

REFERENCES:
patent: 4223277 (1980-09-01), Taylor et al.
patent: 4758746 (1988-07-01), Birkner et al.
patent: 4833349 (1989-05-01), Liu et al.
patent: 4847612 (1989-07-01), Kaplinsky
patent: 4987326 (1991-01-01), Satoh et al.
patent: 5028821 (1991-07-01), Kaplinsky
patent: 5185706 (1993-02-01), Agrawal

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