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Digital circuit without clock cycles
Asynchronous circuit (clockless or self-timed circuit) is a sequential digital logic circuit that does not use a global clock circuit or signal generator
Asynchronous_circuit
Type of logic circuit
Digital sequential logic circuits are divided into synchronous and asynchronous types. In synchronous sequential circuits, the state of the device changes
Sequential_logic
Digital circuit synchronized by clock signal
synchronous circuits. Exceptions include self-synchronous circuits, globally asynchronous locally synchronous circuits, and fully asynchronous circuits. Synchronous
Synchronous_circuit
Type of AC electric motor
An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor that produces torque is obtained by electromagnetic
Induction_motor
Digital electronic system with no global clock signal
Symposium (International Symposium on Asynchronous Circuits and Systems), founded in 1994. A variety of asynchronous papers have also been published since
Asynchronous_system
Asynchronous circuit design methodology
A quasi-delay-insensitive circuit (QDI circuit) is an asynchronous circuit design methodology employed in digital logic design. Developed in response to
Quasi-delay-insensitive circuit
Quasi-delay-insensitive_circuit
Digital logic circuit
flip-flop, or two-hand safety circuit) is a small binary logic circuit widely used in design of asynchronous circuits and systems. It outputs 0 when
C-element
Topics referred to by the same term
Arbiter (electronics), which orders signals in asynchronous circuit Synchronizer, an electronic circuit technique; see metastability in electronics Synchronizer
Synchronizer
Transmission of data at irregular intervals
(ATM). In this case, the asynchronously transferred blocks are called data packets, for example, ATM cells. The opposite is circuit-switched communication
Asynchronous_communication
Dijkstra notation with non-deterministic conditionals
Unlike classical circuit evaluation models, the repetition for a set of guarded commands (corresponding to an asynchronous circuit) can accurately describe
Guarded_Command_Language
Model of computation
Globally asynchronous locally synchronous (GALS), in electronics, is an architecture for designing electronic circuits that addresses the problem of safe
Globally asynchronous locally synchronous
Globally_asynchronous_locally_synchronous
Form of engineering diagram
engineering and computer engineering to describe dynamic behaviour of asynchronous circuits, for the purposes of their analysis or synthesis. Informally, an
Signal_transition_graphs
or dual-ported RAM (random access memory). In asynchronous FIFOs, the memory is an asynchronous circuit that is accessible to logic operating in any clock
FIFO_(electronic)
Computer hardware device
A universal asynchronous receiver-transmitter (UART /ˈjuːɑːrt/) is a peripheral device for asynchronous serial communication in which the data format
Universal asynchronous receiver-transmitter
Universal_asynchronous_receiver-transmitter
Electronic circuits that utilize digital signals
synchronous logic circuits. This interface is inherently asynchronous and must be analyzed as such. Examples of widely used asynchronous circuits include synchronizer
Digital_electronics
Topics referred to by the same term
events Async/await Asynchronous system, a system having no global clock, instead operating under distributed control Asynchronous circuit, a sequential digital
Asynchrony
Computer programming technique
threads to become available. Computer programming portal Asynchronous system Asynchronous circuit Davies, Alex (2012). Async in C# 5.0. O'Reilly. pp. 1–2
Asynchrony (computer programming)
Asynchrony_(computer_programming)
Topics referred to by the same term
data transfer Asynchronous circuit, or self-timed circuit, a sequential digital logic circuit that is not governed by a clock circuit or global clock
Circuit
A delay-insensitive circuit is a type of asynchronous circuit which performs a digital logic operation often within a computing processor chip. Instead
Delay_insensitive_circuit
Device storing number of times an event or process occurred
the chain. The natural counting sequence of such circuits is binary, and consequently most asynchronous counters are binary, with each flip-flop storing
Counter_(digital)
Type of digital logic implemented by Boolean circuits
function or circuit may be arrived upon, and the logic combinational circuit becomes smaller, and easier to analyse, use, or build. Asynchronous circuit Field-programmable
Combinational_logic
Electronic device that allocates access to shared resources
memory arbiter must be designed as an asynchronous arbiter. An important form of arbiter is used in asynchronous circuits to select the order of access to
Arbiter_(electronics)
Digital telecommunications protocol for voice, video, and data
functionality that combines features of circuit switching and packet switching networks by using asynchronous time-division multiplexing. ATM was seen
Asynchronous_Transfer_Mode
Ability of a digital electronic system to remain in unstable equilibrium forever
electronics, an arbiter is a circuit designed to determine which of several signals arrive first. Arbiters are used in asynchronous circuits to order computational
Metastability_(electronics)
Propriety of a circuit
completion is a property of some classes of asynchronous circuit. It means that the output of a circuit may be available as soon as sufficient inputs
Early_completion
RISC processor architecture
on-chip design styles, include self-timed asynchronous circuit, 1-of-4 encoding, fully synchronous circuit, and FPGA. The XAP license agreement allows
XAP_processor
English computer scientist (born 1953)
servers. In 1990, he moved to Manchester to lead research into asynchronous circuits, low-power electronics and neural engineering, where the Spiking
Steve_Furber
Electronic circuit with two stable states
generically to both level-triggered (asynchronous, transparent, or opaque) and edge-triggered (synchronous, or clocked) circuits that store a single bit of data
Flip-flop_(electronics)
communications. These macros are intended to be used in designing digital asynchronous circuits. VerilogCSP also describes nonlinear pipelines and high-level channel
VerilogCSP
Undesirable effect in digital logic
or external influences in both synchronous[citation needed] and asynchronous circuits. Logic hazards are manifestations of a problem in which changes
Hazard_(logic)
tools assume a clocked CPU (a synchronous circuit), so making a clockless CPU (designing an asynchronous circuit) involves modifying the design tools to
History of general-purpose CPUs
History_of_general-purpose_CPUs
Low-power electronic circuits which use reversible logic to conserve energy
contradictory ideas of "clock-powered logic" (adiabatic circuits) and "circuits without clocks" (asynchronous circuits). There are some classical approaches to reduce
Adiabatic_circuit
Method for encoding data in communications
between code words can also be used in the design of asynchronous circuits such as delay insensitive circuits. Constant-weight codes, like Berger codes, can
Constant-weight_code
Any attack based on information gained from the implementation of a computer system
variations in asynchronous circuits are harder to remove. Recently, white-box modeling was utilized to develop a low-overhead generic circuit-level countermeasure
Side-channel_attack
Electronic signal to synchronize circuits
clock from a crystal oscillator. The only exceptions are asynchronous circuits such as asynchronous CPUs. A clock signal might also be gated, that is, combined
Clock_signal
Central computer component that executes instructions
Proceedings, Fifth International Symposium on Advanced Research in Asynchronous Circuits and Systems. University of Manchester Computer Science Department
Central_processing_unit
Data link layer communication protocol
a data-link-layer protocol for connection over synchronous and asynchronous circuits, where it has largely superseded the older Serial Line Internet
Point-to-Point_Protocol
Time for a signal or other quantity to reach its destination
paths are the primary cause of glitches and dynamic hazards in asynchronous circuits due to race conditions. Temperature: Propagation delay changes with
Propagation_delay
Emulation a dedicated physical link over a packet-switched network
Relay is unreliable, but may provide guaranteed QoS. Asynchronous Transfer Mode (ATM), where the circuit is identified by a virtual path identifier (VPI)
Virtual_circuit
Soviet computer scientist (1933–2005)
concentrated in three areas: threshold logic, probabilistic automata, and asynchronous circuits. Due to the Second World War, Varshavsky was evacuated from Leningrad
Victor_Varshavsky
Asynchronous 144-core microprocessor by GreenArrays
The GA144 is an asynchronous, 144-core microprocessor designed by Charles H. Moore, developed and sold by GreenArrays. It is a spatial processor: its 144
GA144
Instrument for measuring, keeping or indicating time
clock signal. (A few research projects are developing CPUs based on asynchronous circuits.) Some equipment, including computers, also maintains time and date
Clock
American computer scientist (born 1947)
analysis of asynchronous circuits with bounded temporal uncertainty", where he first proposed the representation of an asynchronous circuit, with bounded
Harry_R._Lewis
Microprocessor entirely implemented in static logic
Retrieved 2022-08-07. Richard Murray. "PocketBook II hardware". Asynchronous circuit Dynamic logic (digital logic) § Static versus dynamic logic v t e
Static_core
Programming language for programming reactive systems
Nonetheless, asynchronous formalisms are very useful to model, design and verify distributed systems, because they are intrinsically asynchronous. Also in
Synchronous programming language
Synchronous_programming_language
American computer scientist (PhD 1972, Utah)
Davis is mainly known for his work in computer architecture and asynchronous circuits, including influential work on arbiters. He has numerous technical
Alan_L._Davis
Type of computer memory
associated with the clock signals. In the 1990s, asynchronous SRAM was employed for fast access time. Asynchronous SRAM was used as main memory for small cache-less
Static_random-access_memory
American computer scientist
researcher on the Libra/Diem blockchain project. Dill's interests include asynchronous circuit design, software and hardware verification, automatic theorem proving
David_L._Dill
unfoldings in the analysis and synthesis of concurrent systems and asynchronous circuits. The latter is normally achieved through the use of Signal transition
Petri_net_unfoldings
Type of computer memory
synchronous DRAM. In the present day, manufacture of asynchronous RAM is relatively rare. An asynchronous DRAM chip has power connections, some number of address
Dynamic_random-access_memory
Data processing chain
"Two-phase asynchronous wave-pipelines and their application to a 2D-DCT". Proceedings. Fifth International Symposium on Advanced Research in Asynchronous Circuits
Pipeline_(computing)
Electrical circuit detecting phase difference
and superior pull-in range. A phase frequency detector (PFD) is an asynchronous circuit originally made of four flip-flops (i.e., the phase-frequency detectors
Phase_detector
Serial communication protocol for two-channel digital audio
data signals, resulting in simpler receivers than those required for asynchronous communications systems that need to recover the clock from the data stream
I2S
Standardised transport interface for the broadcast industry
Asynchronous Serial Interface, or ASI, is a method of carrying an MPEG Transport Stream (MPEG-TS) over 75-ohm copper coaxial cable or optical fiber. It
Asynchronous_serial_interface
Approach for digital systems design
passing Reactor pattern vs. Proactor pattern Transaction processing Asynchronous circuit Assembly modelling, for CADs The VLSI handbook. Wai-Kai Chen (2 ed
Transaction-level_modeling
Canceling impedances at a particular frequency
electric circuit at a particular resonant frequency when the impedances or admittances of circuit elements cancel each other. In some circuits, this happens
Electrical_resonance
design automation Design flow (EDA) Integrated circuit design Static timing analysis Asynchronous circuit Kahng, Andrew B.; Lienig, Jens; Markov, Igor L
Timing_closure
Transfer of data over a communication channel
circuit Full-duplex Half-duplex Simplex Multi-drop: Bus network Mesh network Ring network Star network Wireless network Point-to-point Asynchronous serial
Data_communication
Methods for synchronizing serial communications
Synchronous and asynchronous transmissions are two different methods of transmission synchronization. Synchronous transmissions are synchronized by an
Comparison of synchronous and asynchronous signalling
Comparison_of_synchronous_and_asynchronous_signalling
Method for converting signals between digital and analog
synchronous modulation, which requires a precise clock for quantization, asynchronous delta–sigma modulation instead runs without a clock. When transmitting
Delta-sigma_modulation
Research branch of Oracle Corporation
Switzerland; and Casablanca, Morocco. Sun Labs worked in areas such as asynchronous circuits, optical communications, new web technologies, Java technologies
Oracle_Labs
British computer scientist
computers as a case study. He continued with work on self-timed (asynchronous) circuits and his students Paul Cunningham and Steev Wilcox started Azuro
Peter Robinson (computer scientist)
Peter_Robinson_(computer_scientist)
electronics, the delay-insensitive minterm synthesis (DIMS) system is an asynchronous design methodology making the least possible timing assumptions. Assuming
Delay-insensitive minterm synthesis
Delay-insensitive_minterm_synthesis
Type of data transfer
Clock skew between different channels is not an issue (for unclocked asynchronous serial communication links). This can be caused by mismatched wire or
Serial_communication
steady-state value in response to any input. asynchronous circuit A digital circuit where states propagate through a circuit without a synchronizing clock impulse
Glossary of electrical and electronics engineering
Glossary_of_electrical_and_electronics_engineering
Communications protocol
terminal equipment) and DCE (data circuit-terminating equipment) are treated as equals. The initiator for Asynchronous Balanced Mode sends an SABM. An additional
High-Level_Data_Link_Control
Standard for serial communication
and asynchronous transmissions are supported by the standard. In addition to the data circuits, the standard defines a number of control circuits used
RS-232
expressions are useful for controlling the behavior of complicated asynchronous circuits. In fact, the finite state assumption may be even more reasonable
Path_expression
Clock deviation from perfect periodicity
Mike P. Jitter and Signal Integrity Verification for Synchronous and Asynchronous I/Os at Multiple to 10 GHz/Gbps. Presented at International Test Conference
Jitter
American computational neuroscientist
the patent titled an Apparatus for Carrying Out Asynchronous Communication Among Integrated Circuits, in collaboration with Massimo Sivilotti and with
Misha_Mahowald
Computer network performance metric
common communications link used by many people is the asynchronous start-stop, or just asynchronous, serial link. If you have an external modem attached
Measuring_network_throughput
Component of electric motor or generator
an asynchronous motor, the winding technically enables the direct-on-line start and can even be used for the motor operation in the asynchronous mode
Damper_winding
Communication protocol property
connection-oriented packet-mode communication, i.e. virtual circuit mode communication: Asynchronous Transfer Mode Connection-oriented Ethernet Datagram Congestion
Connection-oriented communication
Connection-oriented_communication
The following is a list of CMOS 4000-series digital logic integrated circuits. In 1968, the original 4000-series was introduced by RCA. Although more recent
List of 4000-series integrated circuits
List_of_4000-series_integrated_circuits
Using software instead of dedicated hardware to process and make use of signals
Bit banging is a term of art that describes a method of digital data transmission as using general-purpose input/output (GPIO) instead of computer hardware
Bit_banging
Dutch computer scientist
Unconventional Computing. Peper F, Lee J, Adachi S, et al., "Laying out circuits on asynchronous cellular arrays: a step towards feasible nanocomputers?", Nanotechnology
Ferdinand_Peper
Type of computer processor
The asynchronous array of simple processors (AsAP) architecture comprises a 2-D array of reduced complexity programmable processors with small scratchpad
Asynchronous array of simple processors
Asynchronous_array_of_simple_processors
Artificial neural networks Artificial pacemaker ASTM Asymptotic stability Asynchronous circuit Audio and video connector Audio equipment Audio filter Audio frequency
Index of electrical engineering articles
Index_of_electrical_engineering_articles
Type of software or hardware infrastructure
software that generally relies on asynchronous message-passing, as opposed to a request-response architecture. In asynchronous systems, message queues provide
Message-oriented_middleware
American computer scientist (1935–1996)
ear). When he died in 1996, he was working at Sun Microsystems on asynchronous circuits with Ivan Sutherland. Molnar received a bachelor's degree (1956)
Charles_Molnar
Signal able to be decoded without an outside source of synchronization
clock cycle and the data can be retrieved from the transmitted signal. Asynchronous self-clocking signals do not combine clock cycles and data transfer into
Self-clocking_signal
Digital signal that does not reach a valid high or low level
switching between asynchronous clocks; or as the result of a race condition in which a signal takes two separate paths through a circuit, which may have
Runt_pulse
Electronic design automation method
type of circuit under test (full scan, synchronous sequential, or asynchronous sequential), the level of abstraction used to represent the circuit under
Automatic test pattern generation
Automatic_test_pattern_generation
Inter-process communication API
AppleTalk PF_ATMPVC Asynchronous Transfer Mode Permanent Virtual Circuits PF_ATMSVC Asynchronous Transfer Mode Switched Virtual Circuits PF_AX25 Amateur Radio
Berkeley_sockets
Integrated circuit
The 8250 UART (universal asynchronous receiver-transmitter) is an integrated circuit designed for implementing the interface for serial communications
8250_UART
Crossing in digital electronic design
digital circuit from one clock domain into another. If a signal does not assert long enough and is not registered, it may appear asynchronous on the incoming
Clock_domain_crossing
Signal conversion technique
asynchronous modulator circuit won't work with ideal elements which have no delay, because the loop would happen instantaneously. But real circuits will
Delta_modulation
Number of Josephson junctions on a superconducting integrated circuit chip
integrated circuit chip. Josephson junctions are active circuit elements in superconducting circuits. The Josephson junction count is a measure of circuit or
Josephson_junction_count
Point-to-point connection over a packet-switched network
rarely be perfect. The service being carried over the "wire" may be Asynchronous Transfer Mode (ATM), Frame Relay, Ethernet or time-division multiplexing
Pseudowire
Family of technologies that are used to transmit digital data over telephone lines
protocols such as DHCP or PPPoE. Many DSL technologies implement an Asynchronous Transfer Mode (ATM) layer over the low-level bitstream layer to enable
Digital_subscriber_line
Integrated circuit serial port implementation
The 16550 UART (universal asynchronous receiver-transmitter) is an integrated circuit designed for implementing the interface for serial communications
16550_UART
Integrated circuit made by MOS Technology
The 6551 Asynchronous Communications Interface Adapter (ACIA) is an integrated circuit made by MOS Technology. It served as a companion UART chip for
MOS_Technology_6551
Published Interfaces" Asynchronous messaging Batch request (also known as Request Bundle pattern) Blackboard (design pattern) Circuit Breaker Client–server
List of software architecture styles and patterns
List_of_software_architecture_styles_and_patterns
Smart card message
signal) or asynchronously (data bits are exchanged over I/O with another mechanism for bit delimitation, similar to traditional asynchronous serial communication)
Answer_to_reset
Type of AC electrical generator
An induction generator (or asynchronous generator) is a type of alternating current (AC) electrical generator that uses the principles of induction motors
Induction_generator
The Bluetooth Asynchronous Connection-oriented logical transport (ACL) is one of two types of logical transport defined in the Bluetooth Core Specification
Asynchronous connection-oriented logical transport
Asynchronous_connection-oriented_logical_transport
of 7400-series digital logic integrated circuits. In the mid-1960s, the original 7400-series integrated circuits were introduced by Texas Instruments with
List of 7400-series integrated circuits
List_of_7400-series_integrated_circuits
Philosophical paradox regarding free will
while always possible, can be made negligibly low. In asynchronous system design, arbiter circuits have been developed to make such decisions. They can
Buridan's_ass
Network that allows computers to share resources and communicate with each other
SONET/SDH also was the obvious choice for transporting Asynchronous Transfer Mode (ATM) frames. Asynchronous Transfer Mode (ATM) is a switching technique for
Computer_network
Representation of a signal as a rectangular wave with varying duty cycle
integral (blue) hits the limits (green) surrounding the input (red). Asynchronous (i.e., unclocked) delta-sigma modulation produces a PWM output (blue
Pulse-width_modulation
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ASYNCHRONOUS CIRCUIT
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ASYNCHRONOUS CIRCUIT
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