Electronic digital logic circuitry – Multifunctional or programmable – Array
Patent
1996-11-22
1999-03-30
Tokar, Michael
Electronic digital logic circuitry
Multifunctional or programmable
Array
326 41, H03K 19177
Patent
active
058894136
ABSTRACT:
A logic element for an FPGA which can be configured as any one of a random access memory, a shift register and a lookup table. The logic element includes a plurality of memory cells which are interconnected such that the data output of each cell can serve as the input to the next memory cell. Thus the logic element effectively functions as a shift register. Shift registers of arbitrary length can be created by using a lookup table address multiplexer to select any memory cell output (not necessarily the last memory cell output) of the lookup table, and by chaining lookup tables of plural logic elements in series.
REFERENCES:
patent: Re34363 (1993-08-01), Freeman
patent: 4821233 (1989-04-01), Hsieh
patent: 4870302 (1989-09-01), Freeman
patent: 5321399 (1994-06-01), Notani et al.
patent: 5343406 (1994-08-01), Freeman et al.
patent: 5352940 (1994-10-01), Watson
patent: 5394031 (1995-02-01), Britton et al.
patent: 5414377 (1995-05-01), Freidin
patent: 5422823 (1995-06-01), Agrawal et al.
patent: 5442306 (1995-08-01), Woo
patent: 5694056 (1997-12-01), Mahoney et al.
Xilinx, Inc., "The Programmable Logic Data Book," 1996, 4-1 through 4-372, available from Xilinx, Inc., 2100 Logic Drive, San Jose, California 95124.
Cartier Lois D.
Casey Michael R.
Le Don Phu
Tokar Michael
Xilinx , Inc.
LandOfFree
Lookup tables which double as shift registers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Lookup tables which double as shift registers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lookup tables which double as shift registers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1217850