Patent EP0478904A2 successfully refreshed from Google Patents.
EP0478904A2
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EP
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Apparatus for screening digital commands
Assignee: International Business Machines Corp
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Filing: 1991-07-12
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Granted: —
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Expires: 2011-07-12
Abstract
Abstract Apparatus for transferring control of digital command execution from dedicated digital logic to an off chip microprocessor. A command register (11) receives said digital commands. A decoder (17) connected to the command register (11) will be connected via a decoded command to a filter (19) where it may be passed to a dedicated execution logic circuit (12) for execution, or blocked from execution, depending on a preset block code in the filter. Blocked commands are identified by an interrupt to the microprocessor (13), permitting the microprocessor to execute the command.
Inventors
- 👤 Adrian Stephen Butter
- 👤 Hugh Curtis Holland
- 👤 Thomas Brian Mathias
- 👤 Gary Alan Zisko
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 08:20
CPC Classifications
G; G06; G06F; G06F9/00; G06F9/06; G06F9/30; G06F9/3017; G06F9/38; G06F9/3877; G06F9/44; G06F9/455; G06F9/45533
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
81 words
Apparatus for screening digital commands with a command register for receiving said digital commands; a command decoder for providing plural signals identifying each of said commands, characterized by a programmable filter (19) connected to said command decoder (17) for receiving said plural signals, and for receiving a control command identifying one or more of said plural signals to be inhibited; and, execution logic (12) connected to said programmable filter (19) executing all but said one or more of said plural commands.
Claim 2
Dependent Claim
35 words
Apparatus according to claim 1, characterized in that said programmable filter (19) supplies a stop execution signal to said execution logic (12) when said one or more of said plural signals is to be inhibited.
Claim 3
Dependent Claim
61 words
Apparatus according to claim 1 or 2, characterized by a supervisory microprocessor (13) connected to receive said one digital command, and connected to receive a signal from said programmable filter (19) indicating that said one of said plural commands has been inhibited, said microprocessor (13) executing said one digital command and subsequently initiating a resume command to said execution logic (12).
Claim 4
Dependent Claim
73 words
Apparatus according to one of claims 1 - 3, further comprising an OR circuit (20) connected to receive said signal from said programmable filter (19), and a signal from said command decoder (17) indicating that said command register (11) has received an unrecognizable command, said OR circuit (20) providing said signal that a command has been inhibited to said microprocessor (13), wherein said microprocessor provides the control command to said programmable filter (19).
Claim 5
Dependent Claim
175 words
Apparatus for transferring control of execution of digital commands from digital logic to a microprocessor, characterized by a command register (11) for receiving said digital commands; a command decoder (17) connected to said command register (11) for providing a signal identifying each command received by said command register; a programmable filter (19) connected to receive said identifying signals, and a digital code representing a digital command to be blocked, said filter providing an inhibit signal when one of said signals indicates that a command has been received corresponding to said command to be blocked; execution logic (12) connected to receive said identifying signals from said command decoder (17), and to receive said inhibit signal, whereby said execution logic (12) is inhibited from executing said command to be blocked; and, a microprocessor (13) connected to said command register (11) and to said filter (19), said microprocessor executing a blocked digital command in response to an inhibit signal issued from said filter, and issuing a resume command to said execution logic (12) following execution of said command.
Claim 6
Dependent Claim
61 words
Apparatus of claim 5, characterized by an OR gate (20) connected to receive a signal from said command decoder (17) indicating that an unknown command has been received in said command register, and said inhibit signal, said OR gate supplying a signal to said microprocessor (13) indicating that said microprocessor is to execute the digital command in said command register (11).
References Cited (Backward Citations)
No citation records indexed.
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