Other

Massachusetts Institute of Technology

Raytheon Company

Bolt Beranek and Newman Inc.

Lance A Glasser

Hermann A Haus

Randall David Rettberg

Jun-ichi Sano

Alan Z Glasser

Moshe Mazin

William L Barnard

Jens P Schwarz

Ping-Tong Ho

A memory apparatus for storage and retrieval of digital data is disclosed, including a controller and a memory element having an array of memory cells, each cell having fewer ports than are provided by the memory system. The memory cells are adapted for storing digital data words, each word being a set of bits or symbols. The memory array is partitioned into a plurality of bins for storing words, the individual bits of each word being distributed in a selected addressing sequence among a plurality of selected bins in the memory array, such that bin reading conflicts generate a number of errors less than or equal to a numerical error limit K, where K is less than the number of bits in a word. The data words can be manipulated so as to produce error-free results.

Multipart memory apparatus with error detection

An integrated circuit memory having a plurality of row lines; a plurality of select lines; a plurality of output lines; a plurality of memory cells; each pair of memory cells having common outputs coupled to a select one of the plurality of output lines and common address inputs coupled to a select one of the plurality of row lines, wherein ambiguity of which memory cell of the pair of memory cells to be selected, being coupled to a select one of the plurality of row lines and a select one of the plurality of output lines, is determined by two selected ones of the plurality of select lines coupled thereto. Also provided is a first decoder, responsive to an input address, for enabling a select one of the plurality of row lines, and a second decoder, responsive to the row lines and to the input address, for enabling a select one of the select lines which corresponds to pairs of memory cells with an enabled row line.

High density read-only memory

Apparatus is disclosed for reversing the bit order of a portion of a digital word. The apparatus contains a shifter, connected to the input through a bit reversing means, and selector means which forms an output word by selecting appropriate bits either directly from the input word or from the output of the shifter.

Bit reversing apparatus

In the apparatus disclosed herein, a data signal to be phase adjusted is applied to a plurality of delay lines providing progressively greater delays. The outputs of the several delay lines are compared over a period of time and a selection of one of the output signals for utilization is made based on choosing that delay line output which is in opposition to that pair of outputs which straddles or encompasses the most transitions.

Digital phase adjustment

A programmable non-volatile memory cell is disclosed that can be written into the '1,' '0,' or 'previous' state in the presence of unfocused illumination, preferrably ultraviolet (UV) light. The programmed state is controlled by low electrical voltages. Once the illumination is removed the programmed state is non-volatile. The memory cell can be fabricated using conventional MOS processing techniques with no additional mask steps. The cell can thus be implemented on virtually all silicon gate nMOS and CMOS processes.

Non-volatile memory devices

A semiconductor diode laser system with microwave mode locking. The system includes a semiconductor laser diode and an external reflector positioned to receive radiation that emits from the diode and reflects the same back into the diode, the microwave mode locking serving to modulate the radiation and the external reflector being properly positioned to return the radiation to the diode at a return time equal to the period of the drive signal or a submultiple thereof.

Semiconductor diode laser system

Heat exchange apparatus for improving the efficiency of a fireplace is disclosed in the form of a plurality of heat transfer conduits connected at one end to a manifold and containing a plurality of heat exchange elements. A fan means directs air through the manifold and then through the conduits for contact with the heat exchange elements to thereby heat the air which is then discharged into a room.

Growing community of inventors

Lexington, MA, United States of America

Lance A Glasser