US5881255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bus control system incorporating the coupling of two split-transaction busses of different hierarchy
Assignee: Hitachi Ltd
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Filing: 1997-04-21
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Granted: 1999-03-09
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Expires: 2017-04-21
Abstract
Abstract In a data processing system, a plurality of modules connected to a system bus thereof are assigned with identifiers. When a source module initiates a split read access to another module, the source module sends an address of the access destination module and an identifier of the source module. When sending a response to the source module, the destination module returns response data and the identifier of the source module thereto. Checking the identifier from the destination module, the source module determines the response data returned as a response to the initiated access.
Inventors
- 👤 Nobukazu Kondo
- 👤 Seiji Kaneko
- 👤 Koichi Okazawa
- 👤 Hideaki Gemma
- 👤 Tetsuya Mochida
- 👤 Takehisa Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:30
CPC Classifications
G; G06; G06F; G06F13/00; G06F13/38; G06F13/40; G06F13/4004; G06F13/4027; G06F13/14; G06F13/36
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
117 words
An information processing system comprising: a first bus which employs a split bus protocol; a first module coupled to said first bus, wherein the first module has a predetermined identifier assigned thereto; a first bus adapter coupled to said first bus; a second bus coupled to said first bus adapter, wherein the second bus employs the split bus protocol and has a different hierarchy from said first bus; and a second bus adapter coupled to said second bus, for enabling a plurality of devices to couple to said second bus, each device having a predetermined identifier for controlling data transfer from said first module to anyone of said devices based on said identifier of each said device.
Claim 2
Dependent Claim
117 words
An information processing system comprising: a first bus which employs a split bus protocol; a first module coupled to said first bus, wherein the first module has a predetermined identifier assigned thereto; a first bus adapter coupled to said first bus; a second bus coupled to said first bus adapter, wherein the second bus employs the split bus protocol and has a different hierarchy from said first bus; and a second bus adapter coupled to said second bus, for enabling a plurality of devices to couple to said second bus, each device having a predetermined identifier for controlling data transfer from said first module to anyone of said devices based on said identifier of each said device.
Claim 3
Dependent Claim
15 words
The information processing system according to claim 1 wherein said first module is a processor.
Claim 4
Dependent Claim
19 words
The information processing system according to claim 1 wherein said first bus enables coupling to a plurality of processors.
Claim 5
Dependent Claim
24 words
The information processing system according to claim 1 wherein each of said identifiers of each device corresponds to an address cache of said device.
References Cited (Backward Citations)
US538224A
Cited
US3997896A
Cited
US4128883A
Cited
US4290102A
Cited
US4232366A
Cited
US4281380A
Cited
US4543628A
Cited
US4821174A
Cited
US4941088A
Cited
US4797815A
Cited
US4785394A
Cited
US4953072A
Cited
US5146597A
Cited
US5001625A
Cited
US5235684A
Cited
US5274787A
Cited
US5483642A
Cited
US5237567A
Cited
US5191649A
Cited
US5414820A
Cited
US5379384A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-03-08 | 2002-09-07 | 2003-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-08 | 2006-09-07 | 2007-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-08 | 2010-09-07 | 2011-03-09 | $7700.00 | Window Closed / Lapsed |