High speed configuration independent programmable macrocell

Details High speed configuration independent programmable macrocell High speed configuration independent programmable macrocell

1994-12-20

1996-03-26

Westin, Edward P.

Electronic digital logic circuitry

Multifunctional or programmable

Sequential or with flip-flop

326 40, 326 50, 326 97, 327203, H03K 19173, H03K 190948

Patent

active

055024033

ABSTRACT:
A user configurable circuit contains clock logic, a switching element and a data path circuit. Input data is received in the switching element, and the switching element and the data path circuit constitute the entire data path for the circuit. A plurality of user configurable inputs are received to configure the circuit for a particular user application. The clock logic and the switching element implement a logic function that is configurable by the user configurable inputs. The logic function is pre-processed in the clock logic so that minimal delay occurs in the data path. In addition, the propagation delay through the switching element and the register is independent of the user configurable inputs. The user configurable circuit of the present invention has application for use as a macro cell for a programmable logic device permitting the user to configure the circuit as a D-type flip-flop, a T-type flip-flop. In addition, the user selects the polarity for the output circuit.

REFERENCES:
patent: 4870302 (1989-09-01), Freeman
patent: 5225724 (1993-07-01), Scarra et al.
patent: 5426380 (1995-06-01), Rogers

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