Stored and combinational logic function generator without dedica

Details Stored and combinational logic function generator without dedica Stored and combinational logic function generator without dedica

1995-07-07

1996-12-03

Hudspeth, David R.

Electronic digital logic circuitry

Multifunctional or programmable

Array

326 40, 326 93, H03K 19177

Patent

active

055812007

ABSTRACT:
A logic circuit which implements numerous logic functions, stored and combinational, without the use of flip-flops or different types of logic elements. This circuit provides a novel storage element which can emulate any logic function of its inputs. As shown in FIG. 8, a logic function generator (200) has at least three inputs. One input (218) responds to a control signal (202) and a second input (220) responds to a delayed function of the control signal (204). These two signals, in combination with the logic circuit output (210) and other input signals (206and 208), produce the output (210). The stored version of these signals can change on either the rising or falling edge (or both) of the controlling signal. Other combinational signals are also available at the output. The circuit's flexibility arises from the programming of the data bits in the logic function generator, either fixed at time of manufacture or by user programmable means.

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"A Comparison of Universal Logic Module Realizations and Their Application in the Synthesis of Combinatorial and Sequential Logic Networks" by X. Chen & S. L. Hurst IEEE Transactions on Computers vol. C31 No. 2 Feb. 1982 pp. 140-147.
"Reduced Look-up Tables with Increased Functionality" Keith H. Gudger in 2nd Intl. ACM/SIGDA Workshop on Field Programmable Gate Arrays.

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