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Class 710/244 - Access prioritizing


Subclass of Class 710 - Electrical computers and digital data processing systems: input/output
Definition: Subject matter further comprising means or steps for granting
No. of patents: 545
Last issue date: 05/29/2012


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NumberTitleIssue Date
5230054Priority order judging device
Each priority order signal (a code signal having a plurality of digits) is processed at each gate circuit in the following manner. The level of a K-th digit input code signal among the priority order signals is checked and the level of a K-th order judgem...
07/20/1993
5202999Access request prioritization and summary device
An access request prioritization and summary device for determining the current highest priority among n entities. The device includes a bitmap having n bit storage locations. Each one of the n bit storage locations corresponds to one of the entities and ...
04/13/1993
5123105Priority encoder for a content addressable memory
A priority encoder for receiving input request signals at a number of input request terminals and for providing an N-bit output binary code word indicating the binary identification number of the highest-priority, currently-active input request terminal. ...
06/16/1992
4939638Time sliced vector processing
Access by a plurality of instruction streams to a shared resource is managed by preassigning to each instruction stream, arbitration time slots in each of which only one instruction stream is eligible to request access to the resource....
07/03/1990
4926313Bifurcated register priority system
A dual priority hold register enables the transfer of data to memory ports having serial priority in accordance with two stages of priority. First, all latches of a high priority sector of the register are cleared. Then, the highest priority latch of the ...
05/15/1990
4858173Apparatus and method for responding to an aborted signal exchange between subsystems in a data processing system
In a data processing system in which access to a second unit by a first unit through a system bus is determined by an arbitration unit, when a requesting unit that receives access to the system bus is unable to use that access for interaction with the sec...
08/15/1989
4829467Memory controller including a priority order determination circuit
A resource sharing system including one or more resources, a plurality of resource access devices for accessing the resources, a priority order holder for holding a priority order for access competition between the resources and the resource access device...
05/09/1989
4814974Programmable memory-based arbitration system for implementing fixed and flexible priority arrangements
A digital system has a resource, such as a communication bus, adapted for access by a plurality of devices, a plurality of devices adapted to access the resource, and an arbitrator for arbitrating access to the resource by the devices. The arbitrator incl...
03/21/1989
4779089Bus arbitration controller
A bus arbitration controller controls access of a plurality of asynchronous potential master devices to a unitary interconnecting bus by forming a distributed state machine of arbitration logic units in each of the potential master devices. Each arbitrati...
10/18/1988
4774625Multiprocessor system with daisy-chained processor selection
A multiprocessor system includes a priority discriminator which passes a request signal from a master operation processing unit serially through a plurality of slave operation processing units in accordance with a predetermined priority sequence of the sl...
09/27/1988
4722072Priority resolution in bus orientated computer systems
A priority resolution device for bus orientated computer systems. The system includes a plurality of subsystems, each connected to an associated logic circuit, as well as structure for periodically assigning to each of the subsystems together with input t...
01/26/1988
4682282Minimum latency tie-breaking arbitration logic circuitry
Arbitration apparatus provides first-come-first-served access for a plurality of requestors to a commonly shared unit, such as a memory. Each requestor is provided with a counter which is advanced each cycle from an initial count until its respective requ...
07/21/1987
4644467Multi-level dynamic priority selector groups of data elements
A priority selector includes a plurality of interface circuits (16) each connected to a corresponding data element (13) and operatively connected in common with a priority identification signal generator (15) to selectively interface the data elements (13...
02/17/1987
4609995Priority controller
A priority controller includes a pair of read only memories and a register. The register stores information identifying a request circuit to which priority has recently been granted. Corresponding locations of the two read only memories store identical da...
09/02/1986
4604685Two stage selection based on time of arrival and predetermined priority in a bus priority resolver
A priority resolver for providing unambiguous resolution of requests among competing processes vying for access to a common device and which is adapted to a non-distributed environment....
08/05/1986
4546450Priority determination circuit
In a priority assignment circuit receiving service request signals and comprising a plurality of service enable signal transmission units for transmitting a service enable signal in accordance with a priority determined by priority signals, bypass circuit...
10/08/1985
4493036Priority resolver having dynamically adjustable priority levels
A data processing system including a dual ported main memory that can be accessed by I/O controllers via a common bus or directly by the central processing unit. The main memory is comprised of a volatile RAM array that requires periodic refreshing to pre...
01/08/1985
4481583Method for distributing resources in a time-shared system
A method is disclosed for distributing processing resources among a plurality of users of a time-shared system wherein resources are divided among various user accounts; each user assigning specific weights to the various programs (processes) in his accou...
11/06/1984
4435780Separate stack areas for plural processes
Multiple processes in an interrupt driven system are efficiently executed because each process has its own independently identified and addressable stack storage area including a process control block. Each process control block includes a link field for ...
03/06/1984
4434466Apparatus for controlling the access of processors at a data line
An apparatus for controlling the access of a plurality of microprocessors at a data line. The microprocessors are connected by interface components or blocks, logic switching circuits and bus drivers with two lines or conductors. An access request or dema...
02/28/1984
4348741Priority encoder
Each channel of a priority encoder register is equipped with a latch for storing one bit of a binary data word. The channel of highest priority generates an output which is applied to encoding means which in turn generates a unique code. The channel outpu...
09/07/1982
4339808Asynchronous event prioritizing circuit
A prioritizing circuit is provided for arbitrating between asynchronously occurring memory access request and memory refresh request signals to a dynamic RAM memory module. The circuit includes a latch circuit (20), a latch control circuit (21), and prior...
07/13/1982
4035780Priority interrupt logic circuits
Priority interrupt apparatus includes a level priority network, a plurality of priority networks, and selector circuits, each corresponding in number to the number of channel sources operative to generate interrupt requests. Each priority network receives...
07/12/1977
3947824Priority control circuit
A priority control circuit for establishing connections between a data handling system element and a number of subsystems wherein request signals from subsystems are scanned and granted service in a sequence which is determined by their position in a prio...
03/30/1976
3940745Data processing unit having a plurality of hardware circuits for processing data at different priority levels
A data processing unit having a plurality of hardware data processing circuits each one including a program counter register for addressing the microinstructions, an accumulator register and an addressing register for storing the addressing of the operand...
02/24/1976
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