| US 7,577,781 B2 | ||
| Bus system for use with information processing apparatus | ||
| Koichi Okazawa, Tokyo (Japan); Koichi Kimura, Yokohama (Japan); Hitoshi Kawaguchi, Yokohama (Japan); Ichiharu Aburano, Hitachi (Japan); Kazushi Kobayashi, Ebina (Japan); and Tetsuya Mochida, Yokohama (Japan) | ||
| Assigned to Hitachi, Ltd., Tokyo (Japan) | ||
| Filed on May 29, 2008, as Appl. No. 12/155,047. | ||
| Application 12/155047 is a continuation of application No. 11/543878, filed on Oct. 06, 2006, granted, now 7,398,346. | ||
| Application 11/543878 is a continuation of application No. 11/032051, filed on Jan. 11, 2005, granted, now 7,152,130. | ||
| Application 11/032051 is a continuation of application No. 10/787110, filed on Feb. 27, 2004, granted, now 6,907,489. | ||
| Application 10/787110 is a continuation of application No. 09/983373, filed on Oct. 24, 2001, granted, now 6,810,461. | ||
| Application 09/983373 is a continuation of application No. 09/690998, filed on Oct. 18, 2000, granted, now 6,334,164. | ||
| Application 09/690998 is a continuation of application No. 09/518696, filed on Mar. 03, 2000, granted, now 6,195,719. | ||
| Application 09/518696 is a continuation of application No. 09/375356, filed on Aug. 17, 1999, granted, now 6,098,136. | ||
| Application 09/375356 is a continuation of application No. 09/276968, filed on Mar. 26, 1999, granted, now 6,006,302. | ||
| Application 09/276968 is a continuation of application No. 09/143985, filed on Aug. 31, 1998, granted, now 5,935,231. | ||
| Application 09/143985 is a continuation of application No. 08/959913, filed on Oct. 29, 1997, granted, now 5,889,971. | ||
| Application 08/959913 is a continuation of application No. 08/601993, filed on Feb. 15, 1996, granted, now 5,751,976. | ||
| Application 08/601993 is a continuation of application No. 08/449088, filed on May 24, 1995, granted, now 5,668,956. | ||
| Application 08/449088 is a continuation of application No. 08/443361, filed on May 17, 1995, granted, now 5,506,973. | ||
| Application 08/443361 is a continuation of application No. 08/311893, filed on Sep. 26, 1994, granted, now 5,483,642. | ||
| Application 08/311893 is a continuation of application No. 07/705701, filed on May 23, 1991, abandoned. | ||
| Claims priority of application No. 02-144301 (JP), filed on Jun. 04, 1990; and application No. 3-105536 (JP), filed on May 10, 1991. | ||
| Prior Publication US 2008/0244124 A1, Oct. 02, 2008 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. G06F 13/00 (2006.01) | ||
| U.S. Cl. 710—306 [710/308; 710/316] | 28 Claims |
| 1. A data processing system comprising:
a processor bus transferring data, said processor bus operating in accordance with a first specification;
a processor coupled to said processor bus;
a memory bus transferring data, said memory bus operating in accordance with a second specification;
a memory coupled to said memory bus;
a system bus transferring data, said system bus operating in accordance with a third specification;
a device coupled to said system bus; and
a controller coupled to said processor bus, said memory bus, and said system bus;
wherein said controller has a plurality of data transfer modes, said data transfer modes including:
a first mode in which data is bidirectionally transferred between said processor and said memory by directly transferring
data through said processor bus, said controller and said memory bus,
a second mode in which data is bidirectionally transferred between said memory and said device by directly transferring data
through said memory bus, said controller and said system bus, and
a third mode in which data is bidirectionally transferred between said device and said processor by directly transferring
data through said system bus, said controller and said processor bus.
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