Patent US5218702A successfully refreshed from Google Patents.
US5218702A
Expired / Lapsed
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System for selecting request for a resource before decoding of requested resource address and validating selection thereafter
Assignee: Motorola Solutions Inc
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Filing: 1990-06-04
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Granted: 1993-06-08
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Expires: 2010-06-04
Abstract
Abstract An arbitration system and method are provided for arbitrating access to a system resource such as a memory, wherein the address decode and arbitration portions of the arbitration cycle occur simultaneously thereby reducing the overall arbitration cycle time.
Inventors
- 👤 Charles W. Kirtland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:02
CPC Classifications
G; G06; G06F; G06F13/00; G06F13/14
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
200 words
An arbitration system for granting access to a resource coupled to a bus of a computer system, said arbitration system comprising: refresh request means for generating a periodic refresh request signal; address decode means, coupled to said bus, for receiving and decoding a resource address and providing an address decode output signal; address strobe detection means, coupled to said bus, for detecting an address strobe signal on said bus which indicates that an addressed resource is being requested and having as an output an address strobe detection signal; decision means coupled to said refresh request means and coupled to said address strobe detection means for simultaneously selecting the output of one of said refresh request means and address strobe detection means to pass through as the output of said decision means while said address decode means is receiving and decoding said resource address; and decision valid qualification means coupled to said decision means and said address decode means for receiving said output signals of said decision means and said address decode means, and for providing an output signal responsive to said output signal of said decision means when said address decode output signal corresponds to an address of said resource.
Claim 2
Dependent Claim
200 words
An arbitration system for granting access to a resource coupled to a bus of a computer system, said arbitration system comprising: refresh request means for generating a periodic refresh request signal; address decode means, coupled to said bus, for receiving and decoding a resource address and providing an address decode output signal; address strobe detection means, coupled to said bus, for detecting an address strobe signal on said bus which indicates that an addressed resource is being requested and having as an output an address strobe detection signal; decision means coupled to said refresh request means and coupled to said address strobe detection means for simultaneously selecting the output of one of said refresh request means and address strobe detection means to pass through as the output of said decision means while said address decode means is receiving and decoding said resource address; and decision valid qualification means coupled to said decision means and said address decode means for receiving said output signals of said decision means and said address decode means, and for providing an output signal responsive to said output signal of said decision means when said address decode output signal corresponds to an address of said resource.
Claim 3
Dependent Claim
18 words
The arbitration system of claim 1 wherein said address strobe detection means comprises a sample and hold circuit.
Claim 4
Dependent Claim
16 words
The arbitration system of claim 1 wherein said address decode means comprises a sample hold circuit.
Claim 5
Dependent Claim
15 words
The arbitration system of claim 2 wherein said decision means comprises a metastable decision maker.
Claim 6
Dependent Claim
13 words
The arbitration system of claim 1 wherein said bus comprises an asynchronous bar.
Claim 7
Dependent Claim
13 words
The arbitration system of claim 1 wherein said system resource comprises a memory.
Claim 8
Dependent Claim
142 words
In a computer system having a resource, a method for providing an arbitration decision between a refresh request signal and a resource request signal, wherein the resource request signal comprises an address strobe signal and a resource address signal, said method comprising the steps of: (a) detecting an address strobe signal; (b) providing a periodic refresh request signal; (c) making a preliminary arbitration decision between said address strobe signal and said refresh request signal; (d) simultaneously decoding said resource address signal while step (c) is making said preliminary arbitration decision; (e) making a final arbitration decision, corresponding to said preliminary arbitration decision, if said resource address signal from said decoding step corresponds to an address of said resource; and (f) providing a reset signal if said resource address signal from said decoding step does not correspond to said address of said resource.
Claim 9
Dependent Claim
142 words
In a computer system having a resource, a method for providing an arbitration decision between a refresh request signal and a resource request signal, wherein the resource request signal comprises an address strobe signal and a resource address signal, said method comprising the steps of: (a) detecting an address strobe signal; (b) providing a periodic refresh request signal; (c) making a preliminary arbitration decision between said address strobe signal and said refresh request signal; (d) simultaneously decoding said resource address signal while step (c) is making said preliminary arbitration decision; (e) making a final arbitration decision, corresponding to said preliminary arbitration decision, if said resource address signal from said decoding step corresponds to an address of said resource; and (f) providing a reset signal if said resource address signal from said decoding step does not correspond to said address of said resource.
Claim 10
Dependent Claim
12 words
The method of claim 7 wherein said bus comprises an asynchronous bus.
Claim 11
Dependent Claim
19 words
The method of claim 7 wherein said preliminary arbitration decision making step is accomplished with a metastable decision maker.
Claim 12
Dependent Claim
17 words
The method of claim 9 wherein said detecting step is accomplished with a sample and hold circuit.
Claim 13
Dependent Claim
17 words
The method of claim 10 wherein said decoding step is accomplished with a sample and hold circuit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-07 | 1996-12-07 | 1997-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-07 | 2000-12-07 | 2001-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-07 | 2004-12-07 | 2005-06-08 | $7700.00 | Window Closed / Lapsed |