Bi-directional buffers and supplemental logic and interconnect c

Details Bi-directional buffers and supplemental logic and interconnect c Bi-directional buffers and supplemental logic and interconnect c

1997-10-15

1999-11-16

Nelms, David

Electronic digital logic circuitry

Tri-state

With field-effect transistor

326 56, 326 37, H03K 1900, G06F 738

Patent

active

059864710

ABSTRACT:
The bi-directional (BI-DI) buffers and supplemental logic and interconnect (SLIC) cells are designed to be programmed to operate in different modes in order to implement different kinds of logic circuits. In particular, BI-DI buffers of the present invention support at least five different operational modes. In a first mode (Mode A), the BI-DI buffer generates a logic "1" output, for any input value. In a second mode (Mode B), the BI-DI buffer generates a logic "0" output, for any input value. In a third mode (Mode C), the BI-DI buffer buffers the input signal and generates an output signal equal to the input signal. In a fourth mode (Mode D), the BI-DI buffer buffers the input signal and generates an output signal equal to the inverse of the input signal. In a fifth mode, (Mode E), the BI-DI buffer operates as a conventional tri-state driver. Two or more of the BI-DI buffers can be configured to form more complex logic circuits having two or more inputs. For example, groups of BI-DI buffers can be configured as SLIC cells that are part of the basic logic cells for an FPGA. When used in FPGAs, the BI-DI buffers and SLIC cells make implementation of different kinds of logic circuits more efficient than is the case for conventional FPGAs, including logic circuits like decoders and state machines that have large numbers of inputs. At the same time, the FPGAs retain their efficiencies for implementing logic circuits for which FPGAs have traditionally been very efficient, such as random logic and datapath logic.

REFERENCES:
patent: 5191555 (1993-03-01), Tabacco et al.
patent: 5367208 (1994-11-01), El Gamal et al.
patent: 5550782 (1996-08-01), Cliff et al.
patent: 5804986 (1998-09-01), Jones

Affiliated with

Also associated with

Rating

Bi-directional buffers and supplemental logic and interconnect c does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Bi-directional buffers and supplemental logic and interconnect c, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bi-directional buffers and supplemental logic and interconnect c will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1329045