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An asynchronous (ripple) counter is a "chain" of toggle (T) flip-flops in which the least-significant flip-flop (bit 0) is clocked by an external signal (the counter input clock), and all other flip-flops are clocked by the output of the nearest, less significant flip-flop (e.g., bit 0 clocks the bit 1 flip-flop, bit 1 clocks the bit 2 flip ...
A quasi-delay-insensitive circuit (QDI circuit) is an asynchronous circuit design methodology employed in digital logic design.Developed in response to the performance challenges of building sub-micron, multi-core architectures with conventional synchronous designs, QDI circuits exhibit lower power consumption, extremely fine-grain pipelining, high circuit robustness against process–voltage ...
The recovery time for the asynchronous set or reset input is thereby similar to the setup time for the data input. Removal time is the minimum amount of time the asynchronous set or reset input should be inactive after the clock event, so that the data is reliably sampled by the clock. The removal time for the asynchronous set or reset input is ...
An introduction to asynchronous circuit design Archived 23 June 2010 at the Wayback Machine by Davis and Nowick; Null convention logic, a design style pioneered by Theseus Logic, who have fabricated over 20 ASICs based on their NCL08 and NCL8501 microcontroller cores ; The Status of Asynchronous Design in Industry Information Society ...
Applications of LFSRs include generating pseudo-random numbers, pseudo-noise sequences, fast digital counters, and whitening sequences. Both hardware and software implementations of LFSRs are common. The mathematics of a cyclic redundancy check, used to provide a quick check against transmission errors, are closely related to those of an LFSR. [1]
A delay-insensitive circuit is a type of asynchronous circuit which performs a digital logic operation often within a computing processor chip. Instead of using clock signals or other global control signals, the sequencing of computation in delay-insensitive circuit is determined by the data flow.
Metastable Response in 5-V Logic Circuits. Texas Instruments Report. February 1997. Nystrom, Mika, and Alain J. Martin. Crossing the Synchronous Asynchronous Divide. WCED 2002. Patil, Girish, IFV Division, Cadence Design Systems. Clock Synchronization Issues and Static Verification Techniques. Cadence Technical Conference 2004.
The 28L91 will operate on 3.3 or 5 volts. SCC28L91 SCC2692 Currently produced by NXP, these devices are dual UARTs (DUART), consisting of two communications channels, associated control registers and one counter/timer. Each communication channel is independently programmable and supports independent transmit and receive data rates.