EP0272547A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Data processing system having a bus command generated by one subsystem on behalf of another subsystem
Assignee: Bull HN Information Systems Inc
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Filing: 1987-12-09
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Granted: —
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Expires: 2007-12-09
Abstract
Abstract A data processing system includes a system management unit, a number of central subsystems, a main memory and a number of peripheral subsystems all coupled in common to a system bus. Any subsystem may generate a command which includes a first field specifying a destination subsystem, a second field specifying the operation the destination subsystem is to perform. If a response is required, the subsystem generating the initial command may specify a third subsystem for receiving the response command.
Inventors
- 👤 Arthur Peters
- 👤 Richard C. Zelley
- 👤 Elmer W. Carroll
- 👤 George J. Barlow
- 👤 Chester M. Nibby, Jr.
- 👤 James W. Keeley
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 14:03
CPC Classifications
G; G06; G06F; G06F13/00; G06F13/38; G06F13/42; G06F13/4204; G06F13/4234; G06F13/4243
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
123 words
A data processing system comprises: a system bus; management means coupled to said system bus for generating over said system bus a memory reference command including a first and a second control signal, a channel number and a memory address; memory means coupled to said system bus and responsive to said first and said second control signals for reading the contents of a memory location specified by said memory address and generating over said system bus a second half bus cycle command including said channel number and the contents of said memory location; central sybsystem means coupled to said system bus and responsive to said channel number for receiving said second half bus cycle command and storing the contents of said memory location.
Claim 2
Dependent Claim
123 words
A data processing system comprises: a system bus; management means coupled to said system bus for generating over said system bus a memory reference command including a first and a second control signal, a channel number and a memory address; memory means coupled to said system bus and responsive to said first and said second control signals for reading the contents of a memory location specified by said memory address and generating over said system bus a second half bus cycle command including said channel number and the contents of said memory location; central sybsystem means coupled to said system bus and responsive to said channel number for receiving said second half bus cycle command and storing the contents of said memory location.
Claim 3
Dependent Claim
26 words
The system of Claim 1 wherein said management means receives an acknowledge signal from said memory means when said memory means receives said memory reference command.
Claim 4
Dependent Claim
35 words
The system of Claim 2 wherein said management means includes timing means for verifying that said second half bus cycle command is received within a predetermined time if said channel number identifies said management means.
Claim 5
Dependent Claim
24 words
The system of Claim 3 wherein said timing means is disabled by said acknowledge signal when said channel number identified said central subsystem means.
Claim 6
Dependent Claim
160 words
A data processing system comprises: a system bus; a first subsystem coupled to said system bus for generating a first command and a second command, both requiring a response command; a second subsystem coupled to said system bus for receiving said first and said second commands and generating a first response command; said first command including a first field identifying said first subsystem, a second field identifying said second subsystem and a third field specifying the action said second subsystem is to perform, said second system generating said first response command including a fourth field identifying said first subsystem; said second command including said first field identifying a third subsystem, said second field identifying said second subsystem and said third field specifying the action said second subsystem is to perform, said second subsystem generating a second response command including said fourth field identifying said third system; said third subsystem coupled to said system bus for receiving said second response command.
Claim 7
Dependent Claim
160 words
A data processing system comprises: a system bus; a first subsystem coupled to said system bus for generating a first command and a second command, both requiring a response command; a second subsystem coupled to said system bus for receiving said first and said second commands and generating a first response command; said first command including a first field identifying said first subsystem, a second field identifying said second subsystem and a third field specifying the action said second subsystem is to perform, said second system generating said first response command including a fourth field identifying said first subsystem; said second command including said first field identifying a third subsystem, said second field identifying said second subsystem and said third field specifying the action said second subsystem is to perform, said second subsystem generating a second response command including said fourth field identifying said third system; said third subsystem coupled to said system bus for receiving said second response command.
Claim 8
Dependent Claim
28 words
The system of Claim 5 wherein said first subsystem receives an acknowledge signal from said second subsystem when said second subsystem receives said first or said second commands.
Claim 9
Dependent Claim
37 words
The system of Claim 6 wherein said first subsystem includes timing means for verifying that said first response command is received by said first subsystem within a predetermined time if said first field identifies said first subsystem.
Claim 10
Dependent Claim
29 words
The system of Claim 7 wherein said timing means is disabled by said acknowledge signal from said second subsystem when said second command was sent by said first subsystem.
Claim 11
Dependent Claim
84 words
A data processing system comprises: a system bus; a first subsystem coupled to said system bus for generating a command requiring a response command; a second subsystem coupled to said system bus for receiving said command and generating said response command; said command including a first field identifying a third subsystem, a second field identifying said second subsystem and a third field specifying the action said second subsystem is to perform; said third subsystem coupled to said system bus for receiving said response command.
Claim 12
Dependent Claim
84 words
A data processing system comprises: a system bus; a first subsystem coupled to said system bus for generating a command requiring a response command; a second subsystem coupled to said system bus for receiving said command and generating said response command; said command including a first field identifying a third subsystem, a second field identifying said second subsystem and a third field specifying the action said second subsystem is to perform; said third subsystem coupled to said system bus for receiving said response command.
Claim 13
Dependent Claim
24 words
The system of Claim 9 wherein said first subsystem receives an acknowledge signal from said second subsystem when said second subsystem receives said command.
Claim 14
Dependent Claim
58 words
The system of Claim 10 wherein said first subsystem includes timing means for verifying that said response command is received by said first subsystem within a predetermined time if said first field identifies said first subsystem, said timing means being responsive to said acknowledge signal for disabling said timing means when said first field identifies said third subsystem.
References Cited (Backward Citations)
No citation records indexed.
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