Memory hub and access method having internal prefetch buffers Number:7,412,566 from the United States Patent and Trademark Office (PTO) owispatent

Title: Memory hub and access method having internal prefetch buffers

Abstract: A memory module includes a memory hub coupled to several memory devices. The memory hub includes history logic that predicts on the basis of read memory requests which addresses in the memory devices from which date are likely to be subsequently read. The history logic applies prefetch suggestions corresponding to the predicted addresses to a memory sequencer, which uses the prefetch suggestions to generate prefetch requests that are coupled to the memory devices. Data read from the memory devices responsive to the prefetch suggestions are stored in a prefetch buffer. Tag logic stores prefetch addresses corresponding to addresses from which data have been prefetched. The tag logic compares the memory request addresses to the prefetch addresses to determine if the requested read data are stored in the prefetch buffer. If so, the requested data are read from the prefetch buffer. Otherwise, the requested data are read from the memory devices.

Patent Number: 7,412,566 Issued on 08/12/2008 to Lee,   et al.

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Inventors:	Lee; Terry R. (Boise, ID), Jeddeloh; Joseph M. (Shoreview, MN)
Assignee:	Micron Technology, Inc. (Boise, ID)
Appl. No.:	11/510,150
Filed:	August 24, 2006

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Related U.S. Patent Documents

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	Application Number	Filing Date	Patent Number	Issue Date
	10601252	Jun., 2003	7260685

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Current U.S. Class:	711/137 ; 709/250
Current International Class:	G06F 12/08 (20060101)
Field of Search:	711/137,118,154,213,145,113,112,114 710/22,3,100 709/229,250,233,104

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References Cited [Referenced By]

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U.S. Patent Documents

751703	February 1904	Chilton et al.
3742253	June 1973	Kronies
4045781	August 1977	Levy et al.
4240143	December 1980	Besemer et al.
4245306	January 1981	Besemer et al.
4253144	February 1981	Bellamy et al.
4253146	February 1981	Bellamy et al.
4608702	August 1986	Hirzel et al.
4707823	November 1987	Holdren et al.
4724520	February 1988	Athanas et al.
4831520	May 1989	Rubinfeld et al.
4891808	January 1990	Williams
4930128	May 1990	Suzuki et al.
4953930	September 1990	Ramsey et al.
5133059	July 1992	Ziegler et al.
5241506	August 1993	Motegi et al.
5243703	September 1993	Farmwald et al.
5251303	October 1993	Fogg, Jr. et al.
5269022	December 1993	Shinjo et al.
5313590	May 1994	Taylor
5317752	May 1994	Jewett et al.
5319755	June 1994	Farmwald et al.
5327553	July 1994	Jewett et al.
5355391	October 1994	Horowitz et al.
5432823	July 1995	Gasbarro et al.
5432907	July 1995	Picazo, Jr. et al.
5442770	August 1995	Barratt
5461627	October 1995	Rypinski
5465229	November 1995	Bechtolsheim et al.
5479370	December 1995	Furuyama et al.
5497476	March 1996	Oldfield et al.
5502621	March 1996	Schumacher et al.
5544319	August 1996	Acton et al.
5566325	October 1996	Bruce, II et al.
5577220	November 1996	Combs et al.
5581767	December 1996	Katsuki et al.
5606717	February 1997	Farmwald et al.
5638334	June 1997	Farmwald et al.
5638534	June 1997	Mote, Jr.
5659798	August 1997	Blumrich et al.
5687325	November 1997	Chang
5706224	January 1998	Srinivasan et al.
5710733	January 1998	Chengson et al.
5715456	February 1998	Bennett et al.
5729709	March 1998	Harness
5748616	May 1998	Riley
5796413	August 1998	Shipp et al.
5818844	October 1998	Singh et al.
5819304	October 1998	Nilsen et al.
5822255	October 1998	Uchida
5832250	November 1998	Whittaker
5875352	February 1999	Gentry et al.
5875454	February 1999	Craft et al.
5887159	March 1999	Burrows
5889714	March 1999	Schumann et al.
5928343	July 1999	Farmwald et al.
5963942	October 1999	Igata
5966724	October 1999	Ryan
5973935	October 1999	Schoenfeld et al.
5973951	October 1999	Bechtolsheim et al.
5978567	November 1999	Rebane et al.
5987196	November 1999	Noble
6011741	January 2000	Wallace et al.
6023726	February 2000	Saksena
6029250	February 2000	Keeth
6031241	February 2000	Silfvast et al.
6033951	March 2000	Chao
6038630	March 2000	Foster et al.
6061263	May 2000	Boaz et al.
6061296	May 2000	Ternullo, Jr. et al.
6067262	May 2000	Irrinki et al.
6067649	May 2000	Goodwin
6073190	June 2000	Rooney
6076139	June 2000	Welker et al.
6079008	June 2000	Clery, III
6092158	July 2000	Harriman et al.
6098158	August 2000	Lay et al.
6105075	August 2000	Ghaffari
6111757	August 2000	Dell et al.
6125431	September 2000	Kobayashi
6128703	October 2000	Bourekas et al.
6128706	October 2000	Bryg et al.
6131149	October 2000	Lu et al.
6134624	October 2000	Burns et al.
6137709	October 2000	Boaz et al.
6144587	November 2000	Yoshida
6145033	November 2000	Chee
6157743	December 2000	Goris et al.
6157962	December 2000	Hodges et al.
6167465	December 2000	Parvin et al.
6167486	December 2000	Lee et al.
6175571	January 2001	Haddock et al.
6185352	February 2001	Hurley
6185676	February 2001	Poplingher et al.
6186400	February 2001	Dvorkis et al.
6191663	February 2001	Hannah
6201724	March 2001	Ishizaki et al.
6208180	March 2001	Fisch et al.
6212590	April 2001	Melo et al.
6219725	April 2001	Diehl et al.
6223301	April 2001	Santeler et al.
6233376	May 2001	Updegrove
6243769	June 2001	Rooney
6243831	June 2001	Mustafa et al.
6246618	June 2001	Yamamoto et al.
6247107	June 2001	Christie
6249802	June 2001	Richardson et al.
6252821	June 2001	Nizar et al.
6256692	July 2001	Yoda et al.
6266730	July 2001	Perino et al.
6272609	August 2001	Jeddeloh
6285349	September 2001	Smith
6286083	September 2001	Chin et al.
6294937	September 2001	Crafts et al.
6301637	October 2001	Krull et al.
6327642	December 2001	Lee et al.
6330205	December 2001	Shimizu et al.
6347055	February 2002	Motomura
6349363	February 2002	Cai et al.
6356573	March 2002	Jonsson et al.
6367074	April 2002	Bates et al.
6370068	April 2002	Rhee
6370611	April 2002	Callison et al.
6373777	April 2002	Suzuki
6381190	April 2002	Shinkai
6389514	May 2002	Rokicki
6392653	May 2002	Malandain et al.
6401149	June 2002	Dennin et al.
6401213	June 2002	Jeddeloh
6405280	June 2002	Ryan
6421744	July 2002	Morrison et al.
6430696	August 2002	Keeth
6433785	August 2002	Garcia et al.
6434639	August 2002	Haghighi
6434696	August 2002	Kang
6434736	August 2002	Schaecher et al.
6438622	August 2002	Haghighi et al.
6438668	August 2002	Esfahani et al.
6449308	September 2002	Knight, Jr. et al.
6453393	September 2002	Holman et al.
6457116	September 2002	Mirsky et al.
6460108	October 2002	McCoskey et al.
6460114	October 2002	Jeddeloh
6462978	October 2002	Shibata et al.
6463059	October 2002	Movshovich et al.
6467013	October 2002	Nizar
6470422	October 2002	Cai et al.
6473828	October 2002	Matsui
6477592	November 2002	Chen et al.
6477614	November 2002	Leddige et al.
6477621	November 2002	Lee et al.
6479322	November 2002	Kawata et al.
6487556	November 2002	Downs et al.
6487628	November 2002	Duong et al.
6490188	December 2002	Nuxoll et al.
6493803	December 2002	Pham et al.
6496193	December 2002	Surti et al.
6496909	December 2002	Schimmel
6501471	December 2002	Venkataraman et al.
6502161	December 2002	Perego et al.
6505287	January 2003	Uematsu
6523092	February 2003	Fanning
6523093	February 2003	Bogin et al.
6526483	February 2003	Cho et al.
6526498	February 2003	Mirsky et al.
6539490	March 2003	Forbes et al.
6552564	April 2003	Forbes et al.
6553479	April 2003	Mirsky et al.
6564329	May 2003	Cheung et al.
6587912	July 2003	Leddige et al.
6590816	July 2003	Perner
6594713	July 2003	Fuoco et al.
6594722	July 2003	Willke, II et al.
6598154	July 2003	Vaid et al.
6615325	September 2003	Mailloux et al.
6622227	September 2003	Zumkehr et al.
6628294	September 2003	Sadowsky et al.
6629220	September 2003	Dyer
6631440	October 2003	Jenne et al.
6633959	October 2003	Arimilli et al.
6636110	October 2003	Ooishi et al.
6646929	November 2003	Moss et al.
6647470	November 2003	Janzen
6658509	December 2003	Bonella et al.
6662304	December 2003	Keeth et al.
6665202	December 2003	Lindahl et al.
6667895	December 2003	Jang et al.
6681292	January 2004	Creta et al.
6681302	January 2004	Cho et al.
6697926	February 2004	Johnson et al.
6704817	March 2004	Steinman et al.
6715018	March 2004	Farnworth et al.
6718440	April 2004	Maiyuran et al.
6721195	April 2004	Brunelle et al.
6724685	April 2004	Braun et al.
6728800	April 2004	Lee et al.
6731548	May 2004	Pax
6735679	May 2004	Herbst et al.
6735682	May 2004	Segelken et al.
6745275	June 2004	Chang
6751113	June 2004	Bhakta et al.
6751703	June 2004	Chilton
6751722	June 2004	Mirsky et al.
6754117	June 2004	Jeddeloh
6754812	June 2004	Abdallah et al.
6756661	June 2004	Tsuneda et al.
6760833	July 2004	Dowling
6771538	August 2004	Shukuri et al.
6772295	August 2004	Spencer et al.
6775747	August 2004	Venkatraman
6782466	August 2004	Steele et al.
6785780	August 2004	Klein et al.
6788104	September 2004	Singh et al.
6789173	September 2004	Tanaka et al.
6792059	September 2004	Yuan et al.
6792496	September 2004	Aboulenein et al.
6795899	September 2004	Dodd et al.
6799246	September 2004	Wise et al.
6799268	September 2004	Boggs et al.
6804760	October 2004	Wiliams
6804764	October 2004	LaBerge et al.
6807630	October 2004	Lay et al.
6811320	November 2004	Abbott
6816947	November 2004	Huffman
6820181	November 2004	Jeddeloh et al.
6821029	November 2004	Grung et al.
6823023	November 2004	Hannah
6829705	December 2004	Smith
6845409	January 2005	Talagala et al.
6889304	May 2005	Perego et al.
6904556	June 2005	Walton et al.
6910109	June 2005	Holman et al.
6947672	September 2005	Jiang et al.
6980042	December 2005	LaBerge
7107415	September 2006	Jeddeloh et al.
7318130	January 2008	Morrow et al.
2001/0039612	November 2001	Lee
2002/0112119	August 2002	Halbert et al.
2002/0116588	August 2002	Beckert et al.
2002/0120709	August 2002	Chow et al.
2002/0144064	October 2002	Fanning
2002/0178319	November 2002	Free Web Sudoku Puzzles. Solve with your browser.   3               7       1 6       5 6       3 2             4   5   2     1 6   9 8     9   7   2             3 5       6 1       1 7       5               2   What is it?