US4942573A
Expired / Lapsed
US
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Loosely coupled parallel network simulator
Assignee: Unisys Corp
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Filing: 1987-03-25
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Granted: 1990-07-17
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Expires: 2007-03-25
Abstract
Abstract A loosely coupled parallel network simulator has been described which employs a time multiplex bus to which a plurality of processing sites are coupled with each processing site being assigned one or more particular time slots during the bus cycle. Each processing site contains a sequencing RAM or control store which determines that clock time during the bus cycle that the processing site is to be given access for either transmission or reception of data segments.
Inventors
- 👤 Thomas R. Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:56
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
200 words
A network simulator for simulating a plurality of parallel processing networks, said simulator comprising: a plurality of buses for transmitting information segments to processing sites; each of said buses includes data line means to transmit an information segment, at least one control line means to transmit control information related to said information segment; and a reply line means for indicating that another processing site is coupled to said bus to receive said information segment; and a plurality of sets of processing sites each set being coupled to a given one of said plurality of buses, each processing site having a processor means and interface means coupling said processor to said bus; and clock means coupled to each of said interface means to synchronize time intervals during which said respective interface means couples it corresponding processor means to its corresponding bus; and time multiplex switching means coupled to each of said buses to receive an information segment from one of said buses for transmission on another of said buses; and each of said interface means including sequencing means coupled to said clock means to select during which time interval the corresponding processor means is to be coupled to its respective bus.
Claim 2
Dependent Claim
200 words
A network simulator for simulating a plurality of parallel processing networks, said simulator comprising: a plurality of buses for transmitting information segments to processing sites; each of said buses includes data line means to transmit an information segment, at least one control line means to transmit control information related to said information segment; and a reply line means for indicating that another processing site is coupled to said bus to receive said information segment; and a plurality of sets of processing sites each set being coupled to a given one of said plurality of buses, each processing site having a processor means and interface means coupling said processor to said bus; and clock means coupled to each of said interface means to synchronize time intervals during which said respective interface means couples it corresponding processor means to its corresponding bus; and time multiplex switching means coupled to each of said buses to receive an information segment from one of said buses for transmission on another of said buses; and each of said interface means including sequencing means coupled to said clock means to select during which time interval the corresponding processor means is to be coupled to its respective bus.
Claim 3
Dependent Claim
15 words
A simulator according to claim 1 wherein: each sequencing means is a programmable control store.
Claim 4
Dependent Claim
38 words
A simulator according to claim 1 further including: a plurality of counter means each coupled to said clock means and to a corresponding sequencing means to reset its corresponding sequencing means after a given number of time intervals.
Claim 5
Dependent Claim
22 words
A simulator according to claim 1 wherein: each interface means includes transmitting means to transmit an information segment on its corresponding bus.
Claim 6
Dependent Claim
22 words
A simulator according to claim 1 wherein: each interface means includes receiving means to receive an information segment from its corresponding bus.
Claim 7
Dependent Claim
157 words
A network simulator for the simulation of a plurality of different parallel processing networks, said simulator comprising: bus means for the transmission of information segments to processing sites; a plurality of processing sites each having a processor means and an interface means coupling said processor means to said bus means; said bus means including data line means to transmit an information segment, at least one control line means for transmitting control information related to said information segment; and a reply line means for indicating that another processing site is coupled to said bus means to receive said information segment; and clock means coupled to each of said interface means to synchronize time intervals during which said interface means couples its respective processing site to said bus means; and said interface means including sequencing means coupled to said clock means to select during which time interval the corresponding processing site is to be coupled to said bus means.
Claim 8
Dependent Claim
157 words
A network simulator for the simulation of a plurality of different parallel processing networks, said simulator comprising: bus means for the transmission of information segments to processing sites; a plurality of processing sites each having a processor means and an interface means coupling said processor means to said bus means; said bus means including data line means to transmit an information segment, at least one control line means for transmitting control information related to said information segment; and a reply line means for indicating that another processing site is coupled to said bus means to receive said information segment; and clock means coupled to each of said interface means to synchronize time intervals during which said interface means couples its respective processing site to said bus means; and said interface means including sequencing means coupled to said clock means to select during which time interval the corresponding processing site is to be coupled to said bus means.
Claim 9
Dependent Claim
41 words
A simulator according to claim 6 wherein said interface means includes time multiplex switching means coupled to said bus means to receive an information segment from one bus of said bus means for transmission on another bus of said bus means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-16 | 1994-01-15 | 1994-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-16 | 1998-01-15 | 1998-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-16 | 2002-01-15 | 2002-07-17 | $7700.00 | Window Closed / Lapsed |