control bus


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control bus

(architecture)
In a digital computer, the signal paths that carry commands from the instruction decode logic to various different functional units such as the ALU, memory address register, memory data register and other buffers.

Named by analogy with the address bus and data bus, each of which carries a set of related signals, the signals carried by the control bus are more independant.

Some might include other signals such as timing (clock) and status under the term, further reducing its similarity to other busses.
References in periodicals archive ?
For the purpose of choosing the fuzzy parameter settings, two descriptive sets are introduced for a selected state variable x at a load control bus i:
Processor on a control bus with local memories for programs (program load memory) and control structures (control memory).
So we must cope with Fieldbus, VMEFuturebus, Multibus, Standard Bus, Mod-bus, Bitbus, Serial Bus, Seriplex Control Bus, Genius I/O, Interbus-S, Sensoplex, DeviceNet, Universal Serial Bus, IEEE 1394 (Firewire), RS232, RS485, Lightbus, SERCO, Profibus (widely used in Europe), CEBus, LONWorks, Wor1dFIP, VMEbus/VXI, Compact PCI/PXI, PC/104, HPIB (IEEE-488), PLC Bus, CANbus and other buses as yet unheard of.
The standard provides key features that couple with SAE Standard AS5643 to create a deterministic, robust, and redundant system architecture that meets most A&D requirements for a real-time control bus.
Giving power to control bus services back to local authorities.
LABOUR AM Huw Lewis has called on Westminster to grant the Assembly the power to control bus services.
Whilst the council does not directly control bus services the Lib Dems welcome plans to introduce elements of re-regulation.
The fastest SMUs combine a test sequencer with an on-board script processor and high-speed control bus that allows master-slave operation of multiple SMUs in a true parallel channel arrangement.
In the August 2006 Industry Focus article on Automotive Electronics, "Media Oriented Systems Transport (MOST[R]): A High-speed Multimedia and Control Bus," a caption accompanying an illustration states "System complexity increases exponentially when additional components are added;" and a statement in the text reads "As the number of devices in a car goes up, the number of connections required to control the system rises exponentially.
It provides full-frame, sub-sampled or windowed 8-bit images in a wide range of formats controlled through a serial camera control bus (SCCB) interface.
Ethernet, with its higher bandwidth and ubiquitous usage, seems a natural alternative to the market-leading GPIB instrument control bus for automating instruments.
Any PTA would control bus and train services, ensuring they connect and arrange for a single ticket to be used for a journey involving both modes of transport.