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Topic: Content addressable memory

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Content-addressable memory - Patent 4377855 A content addressable memory cell as in claim 1 wherein the ratios of the width-to-length of the first and third transistors are less than one-sixth the ratio of the width-to-length of the second and fourth transistors. A content addressable memory as in claim 1 wherein a second plurality of memory cells associated with another stored data word share the ground line with the first plurality of memory cells and are coupled to a second sense line. The method of operating a content-addressable memory cell as in claim 8 wherein the voltage applied to the sense line during the step of comparing and during a static mode of operation wherein no signals are applied to the inverter inputs is substantially equal to two threshold voltages. www.freepatentsonline.com /4377855.html   (3768 words)

Match line sensing amplifier for content addressable memory patent When the contents stored in the CAM memory storage location match the data in the comparand register, the local match detection circuit returns a match indication. A CAM is a memory device that accelerates any application requiring fast searches of a database, list, or pattern, such as in database machines, image or voice recognition, or computer and communication networks. In addition, the CAM may return the identification of the address/memory storage location in which the desired data is stored or one of such addresses, such as a highest priority match address, if more than one corresponding CAM storage location contained matching data. www.freshpatents.com /Match-line-sensing-amplifier-for-content-addressable-memory-dt20050203ptan20050024909.php   (1785 words)

Kostas Pagiamtzis :: Content-Addressable Memory (CAM) Primer Content-addressable memories (CAMs) are hardware search engines that are much faster than algorithmic approaches for search-intensive applications. CAMs are composed of conventional semiconductor memory (usually SRAM) with added comparison circuitry that enable a search operation to complete in a single clock cycle. The match address output of the CAM is in fact a pointer used to retrieve associated data from the RAM. www.eecg.toronto.edu /~pagiamt/cam/camintro.html   (1615 words)

World Intellectual Property Organization An apparatus, comprising: a content addressable memory; and a cross-bar switch coupled to the content addressable memory, the cross-bar switch configured to receive an input string and transmit a filtered comparand string to the content addressable memory. The CAM device typically includes a priority encoder to translate the matched location into a match address or CAM index and outputs this address to a status register so that the matched data may be accessed. CAM device 320 may be a multiple block CAM device with each block capable of storing a different table for comparand lookups, as discussed below in relation to Figures 4A and 4B. www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=03/19571.030814&ELEMENT_SET=DECL   (11033 words)

CSD-NOVEMBER 1999: Using Content-Addressable Memory for Networking Applications CAM provides a performance advantage over other memory search algorithms (such as binary and tree-based searches or look-aside tag buffers) by comparing the desired information against the entire list of prestored entries simultaneously, often resulting in an order-of-magnitude reduction of search time. CAM is ideally suited for several functions, including Ethernet address lookup, data compression, pattern-recognition, cache tags, high-bandwidth address filtering, and fast lookup of routing, high-bandwidth address filtering, user privilege, security, or encryption information on a packet-by-packet basis for high-performance data switches, firewalls, bridges, and routers. The CAM compares the received data against the table that has been stored within, and if the comparison yields a match, the port identification is given, and routing control forwards the packet to the correct port or address (see Figure 2). www.csdmag.com /main/1999/11/9911feat3.htm   (2175 words)

Implementing a Cache Controller using Content Addressable Memory Content addressable Memory Introduction: CAM is designed to enhance data retrieval speed from a particular location in a storage array. In their system called the Crytron Catalog Memory, a pattern of bits was input in parallel to the memory and an output line indicated whether a match was found. The cache memory system is managed by an intelligent circuit called the cache memory controller. students.ou.edu /B/Rupa.Balan-1/report.html   (2493 words)

Virtual cache system using page level number generating CAM to access other memories for processing requests relating to a page - Patent 4785398 The contents of PAC memory 14-408 are addressable by any 20-bit page frame number (PFN) portion of a memory physical address of a write command applied to system bus 12 by another one of the other subsystems of FIG. The cache memory of the present invention utilizes a physical address CAM which is coupled to respond to the addresses of data being written into main memory by any other processing unit. The BTA memory 14-414 also is connected to receive block number (BN) address signals from the address bus of system bus 12 which have been previously stored in a snoop register of block 14-450 in response to a bus write command. www.freepatentsonline.com /4785398.html   (7669 words)

CAM - Open Encyclopedia CAM is an abbreviation for all of the following: open-encyclopedia.com /CAM   (68 words)

Content Addressable Memory MPbase's internal structure is in part based on the concept of content-addressable memory (CAM). With conventional indexing schemes the data content is used with a hash or index to produce the address location of the data. It is important to differentiate CAM from a hash key or traditional index. www.openskytech.com /ContentAddressableMemory.htm   (406 words)

Designing Computers and Digital Systems Each cell of a content addressable memory has two parts: the entry name by which the cell is addressed, and the data associated with the entry name. The content addressable memory, as its name implies, is addressed by content rather than by an implicit or explicit address. There are numerous applications for content addressable memories both in hardware and software. research.microsoft.com /~gbell/Designing_Computers_and_Digital_Systems/00000301.htm   (519 words)

A Dynamically Reconfigurable FPGA-based Content Addressable Memory for IP Characterization - Ditmar (ResearchIndex) Ditmar, "A Dynamically Reconfigurable FPGA-based Content Addressable Memory for IP Characterization, " Master's thesis, KTH- Royal Institute of Technology, Stockholm, Sweden, 2000. @inproceedings{ ditmar00dynamically, author = "Johan Ditmar and Kjell Torkelsson and Axel Jantsch", title = "A Dynamically Reconfigurable {FPGA}-Based Content Addressable Memory for Internet Protocol Characterization", booktitle = "{FPL}", pages = "19-28", year = "2000", url = "citeseer.ist.psu.edu/ditmar00dynamically.html" } In this report three implementations of FPGA-based dynamically reconfigurable Content Addressable Memories (CAMs) are described for Internet Protocol Version 6 characterization. citeseer.ist.psu.edu /ditmar00dynamically.html   (596 words)

DUO - Digital utgivelse ved Universitetet i Oslo - A Variable Word-Width Content Addressable Memory (CAM) for Fast String Matching Content Addressable Memories (CAMs) are known to be fast string matchers, but offer little flexibility. A typical feature for this CAM is that the length of each word is independent from the others, in contrast to common CAMs where all words have the same length. To be able to effectively reconfigure the CAM, a software technique has been developed for creating the VHDL code. urn.nb.no /URN:NBN:no-9896   (300 words)

RoB-in -- Content Addressable Memory An interesting idea for an alternative event indexing scheme is to use Content-addressable Memory. This would allow us to keep a pool of event descriptors which are arbitrarily allocated to incoming events with the association between event ID and event descriptor being held in the cam. www.hep.ucl.ac.uk /atlas/rob-in/cam-for-index.html   (46 words)

Patent 5,576,985 - Integrated content addressable read only memory An integrated memory device can be used as a Content Addressable Memory (CAM) or as a Random Addressable Memory (RAM) for applications in data compression, video compression or Autosophy robots. 5,576,985 - Integrated content addressable read only memory Patent 5,576,985 - Integrated content addressable read only memory www.autosophy.com /5576abst.htm   (168 words)

ElectronicsWeekly.com - Cypress to replace content addressable memory Cypress Semiconductor is planning to introduce replacement chips for content addressable memories (CAMs) that promise to be cheaper and use less power and board space. CAMs, particularly ternary CAMs, are the best method of storing packet routing tables in networking products.... The comms chip firm gained its new expertise in CAM replacement from its purchase of Sahasra, a five person team based in Silicon Valley. www.electronicsweekly.com /Articles/2002/05/29/25429/Cypresstoreplacecontentaddressablememory.htm   (270 words)

CNU/CEBAF/NASA COLLABORATION -- Content Addressable Memory This group is developing a custom Content Addressable Memory (CAM). The CAM is being specifically developed for a particle tracking application at CEBAF and will be used in the Hall B triggering system. The CAM is being designed with the Cadence tools in conjunction with the CMOSX 0.8 micron standard cell library. www.pcs.cnu.edu /~rhodson/cam/CamPage.html   (153 words)

CITIDEL: Viewing 'A new Hopfield-style network for content-addressable memories' Introduction A content-addressable memory (CAM) model is a model of retrieval of stored memories from incomplete, noisy or ambiguous cues, or multiple competing hypotheses. It can be considered as an attempt to model certain functional aspects of human memory capabilities. A connectionist CAM model, additionally, attempts to model, to some extent, the human-like architecture responsible for such capabilities. www.citidel.org /?op=getobj&identifier=oai:CiteSeerPSU:348657   (177 words)

McGill Cognitive Science Abstracts Application of constraint-satisfaction neural networks to a variety of psychological phenomena are mentioned, including content-addressable memory, schema completion, analogy mapping, explanation, decision making, impression formation, attitude change, cognitive dissonance, visual object recognition, word pronunciation, and neuropsychological deficits. www.cogsci.mcgill.ca /abstracts.html   (1569 words)

Neural Nets Inference and Content Addressable Memory - Mazza (ResearchIndex) Abstract: We consider Whittle's probabilistic content addressable memory, the antiphon, which is designed for recovering stored patterns from nonlinear distorsions of the input messages. Mazza, C. Neural Net Inference and Content Addressable Memory. 1 The antiphon: a device for reliable memory from unreliable c.. citeseer.ist.psu.edu /mazza96neural.html   (646 words)

Cascading Content-Addressable Memories The various methods of connecting multiple content-addressable memory (CAM) devices to form a memory system of larger dimensions are surveyed. [3] "PNC1480 64-Kbit Content Addressable Memory: Advance Information," GEC Plessey Semiconductors, Swindon, Wiltshire, UK, June 1991. [13] J.P. Wade and C.G. Sodini, "A Ternary Content Addressable Search Engine," IEEE J. Solid-State Circuits, Vol. csdl2.computer.org /persagen/DLAbsToc.jsp?resourcePath=/dl/mags/mi/&toc=comp/mags/mi/1992/03/m3toc.xml&DOI=10.1109/40.141603   (456 words)

Hardware Reviews - Re: Cheap memory? Solution! Content Addressable Memory (CAM) and a Random Addressable "Autosophy databases work best with large Content Addressable Memories Memory locations are normally filled with data, by hardware.mcse.ms /archive10-2004-5-13645.html   (210 words)

Content Addressable Memory and Network Search Engine Challenges Content Addressable Memory (CAM) is a very specific type of memory used only by search engines. Content Addressable Memory and Network Search Engine Challenges This is a contributed article from a reader who has something to say. www.eeproductcenter.com /printableArticle.jhtml?printable=true&articleID=60402394   (101 words)

Light Reading - Networking the Telecom Industry CAMPBELL, Calif. -- CMOS Micro Device, Inc. (CMD), a leading developer of high speed, low power Ternary Content Addressable Memory (CAM) technology, today announced its 400 MHz clock, CMD400 high-density per bit Ternary CAM core, is available for licensing. "We've been devoted to developing high speed and low power Ternary Content Addressable Memory to provide more choice for companies that need embedded CAM or CAM chips," says Paul Huang, the founder of CMOS Micro Device, Inc. The CMOS Micro Device SRAM-based Ternary CAM has more than three times the performance of today's leading products with similar processing technology. www.lightreading.com /document.asp?doc_id=18017&print=true   (137 words)

Electronic Design: Content-addressable memory speeds up lossless compression.(Design view: networking)@ HighBeam Research The encoder relies on content searching, while the decoder can be implemented using conventional memory. In a conventional device, an address is supplied and data is read from the memory. In a CAM, data is presented to the CAM and a parallel search is... highbeam.com /library/doc0.asp?docid=1G1:108443687&refid=ink_tptd_mag   (204 words)

content addressable memory - OneLook Dictionary Search Tip: Click on the first link on a line below to go directly to a page where "content addressable memory" is defined. We found 2 dictionaries with English definitions that include the word content addressable memory: content addressable_memory : Free On-line Dictionary of Computing [home, info] www.onelook.com /?loc=rescb&w=content+addressable+memory   (84 words)

Content-addressable Memory Encyclopedia Article, Definition, History, Biography Looking For content addressable memory - Find content addressable memory and more at Lycos Search. Find content addressable memory - Your relevant result is a click away! Look for content addressable memory - Find content addressable memory at one of the best sites the Internet has to offer! www.greatartworks.com /encyclopedia/Content-addressable_memory   (152 words)

Reasoning Errors In The Current Models of Human Cognition Using this double definition, a proper retrieval in neuronal system can be explained by saying that it is done by contents-addressable memory (sense 1), and this contents-addressable memory can be implemented in neurons (sense 2). It is trivially obvious that humans possess memory in sense (1). For example, the simplicity assumption may arise because of the confusion between genetically-programmed/learned features, and the 'evidence about memory' error can be regarded as a modularity assumption. human-brain.org /errors.html   (11784 words)

Reduced-pitch 6-transistor NMOS content-addressable-memory cell (US6188594) Semiconductor associative memory device with memory refresh during match and read operations wherein when the second storage transistor is charged when the CAM cell was written to a low state, the match line is discharged to indicate a mis-match when the second match transistor is activated by the second bit line being in a high state; wherein when the first storage transistor is charged when the CAM cell was written to a high state, the match line is discharged to indicate a mis-match when the first match transistor is activated by the first bit line being in a high state; www.delphion.com /details?pn=US06188594__   (748 words)

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