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18 Threads found on Asynchronous Digital Design
It depends on whether you want synchronous circuit or asynchronous one. And there are many techniques to design it. In synchronous you may first draw state diagram (moore or mealy), then according to flip flop conditions you may proceed (state assignment, nest states, equations etc). In asynchronous you may use state diagram or state table, (...)
You don't need to synchronize an asynchronous reset. That's why it's called asynchronous. It is a non-clocked signal.
Dear all, How to design a FIFO for taking two ASI inputs.Experts please tell me the flow. Thank's Sushant.M
Have to do a 4-bit counter code in VHDL. It hads a 4 line input (A) a 10Hz CLK input a load input which is asynchronous a UP/Down (Down is Not down) and is synchronous a Reset input which is asynchronous a 2 line setect input line (x) a 2 line setect input line (y) a 4 line output (count) a one line output called (xeq Y) Does anyone kn
Is synchronous or asynchronous design prefered? Plz give reasons. Async design is usually infered by a Latch in FPGA design while sync design by a flop. So, which is the better idea of designing?
Additional materials on asynchronous Circuits design:
I think asynchronous designS will be the future... :idea:
Hello, I want to learn Finite State Machine design, both synchronous and asynchronous. Which book should I start with. I want to learn from beginning. Thanks
How it is useful in digital design? any advantages over normal FF? The advantage of asynchronous clear is this: the initial state can be set even if there is no clock. This is useful in many situations. For example, suppose the FF is controlling a solenoid and the FF, in turn, is controlled by a cpu. You
If your design includes asynchronous logic, I suggest that you use latch to do some logic about interface, but I can not believe a full latched chip which does not use Dff triggers
digital logic for SAR is not so complex, and the best way is to do it by yourself with D-FF with asynchronous reset. You have such schematics in books. Only you need to adjust your start and stop signals. If somebody else writes vhdl code for you, you will need additional time. If you write as analog designer you will always suspect
i can suggest some books that cover these topics. asynchronous Circuits using asynchronous SEQUENTIAL CIRCUIT design from digital design by MORRIS MANO PERIPHERALS AND INTERFACING OF 8051 Typical Bus structure ? Bus ? memory organization ? Timing characteristics ? Extended Model and Memory (...)
I am agree with you about the asynchronous circuit will play a great role in the future's digital design. but i think that the synchronous circuit will still the most important methods in future even thought more powerful synthesis eda tools can be used for asynchronous circuits . because man is always favour to a easy (...)
Hi, Nothing is stable in the real world. You need to think about all kind of noises in your design, especially with mechanical sensors. So if you want stable signal you need some kind of deglitcherizer. If you use asynchronous signal you to deglitcherize your signal with synchronuos digital circuit or with simple RC circuit. With (...)
1. What is setup/hold time and metastability? 2. How to interconnect two synchronous digital design with different clock domains? or How to connect asynchronous external signal to synchronous design? 3. What is DFT? (sometimes say Discrete Fourier Transformation :)). 4. Whal is logic race?
Perhaps a good book, like "digital design", by John F. Wakerly, can help you. In this book you can read the following: For proper system operation, the hardware design of a state machine should ensure that it enters a known initial state on power-up. Most systems have a RESET signal that is asserted during power-up. If a state machine (...)
I have to develop asynchronous state machines (no common clock. I can use only RS flip flop). I prepare the state diagrams and then I have to define the state and output equations. I'm missing something passing from state diagrams ( I use asm chart) to equation/schematic circuit. Is there a tutorial explaining how to design an (...)
Hi The complexity of today's VLSI systems requires new design methods based on asynchronous techniques, concurrency, high-level synthesis, and verification. The research of the asynchronous VLSI group at Caltech focuses on methods and tools for the design of high-performance and low-energy asynchronous (...)