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Asynchronous counter

A counter and asynchronous technology, applied in the direction of asynchronous pulse counters, etc., can solve the problems of reducing timing analysis, asynchronous counter glitches, etc., and achieve the effect of reducing difficulty and eliminating glitch signals.

Pending Publication Date: 2021-07-23
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the above technical problems, this application provides an asynchronous counter to solve the problem of glitches in the prior art during the working process of the asynchronous counter and reduce the difficulty of timing analysis

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Embodiment Construction

[0049] As mentioned in the background art, the asynchronous counter in the prior art will cause glitches in the signal of the circuit during the reset process, which increases the difficulty of timing analysis.

[0050] Specifically, the inventor found that the asynchronous counter in the prior art usually uses the asynchronous feedback method to generate the reset signal, but the duration of the reset signal generated by this method is very short, and the reset signal is directly transmitted to the reset terminal of the flip-flop to make the trigger device reset, which can cause glitches in the circuit.

[0051]In order to solve this problem, an embodiment of the present application provides an asynchronous counter, which includes an asynchronous counting circuit, a value comparison circuit and a feedback reset circuit, wherein the feedback reset circuit is used to The comparison control signal generates the second reset signal in the first state or the second state, so that ...

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Abstract

The invention discloses an asynchronous counter, which comprises an asynchronous counting circuit, a numerical value comparison circuit and a feedback reset circuit, and is characterized in that the feedback reset circuit is used for generating a second reset signal in a first state or a second state based on a counting clock signal and a comparison control signal, so the asynchronous counting circuit performs resetting or counting operation according to the state of the second reset signal, and the duration of the second reset signal is equal to preset time, namely, the feedback reset circuit delays the state of the comparison control signal to a certain degree; the second reset signal with the duration equal to the preset time is generated, so that when the reset operation needs to be carried out, the second reset signal with the longer duration can eliminate the phenomenon that the circuit generates a burr signal due to the fact that the retention time of the reset signal is too short, and the difficulty of time sequence analysis is reduced.

Description

technical field [0001] The present application relates to the technical field of integrated circuits, and more specifically, relates to an asynchronous counter. Background technique [0002] A counter is a common sequential logic circuit and an important part of a digital circuit. Its most basic function is to count by counting the number of clock pulses. [0003] Counters are divided into synchronous counters and asynchronous counters according to whether the flip-flops use the same clock signal source. The synchronous counter circuit is stable and easy to control, but the circuit is complex and requires more transistors, so the power consumption is also greater; the clock signal of the asynchronous counter is only added to the clock port of the first flip-flop, and the clock signal of the subsequent flip-flops It is the output of the flip-flop of the previous stage, which has a small scale and low power consumption. [0004] The n-bit binary counter can obtain any N-ary ...

Claims

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Application Information

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IPC IPC(8): H03K23/58
CPCH03K23/58
Inventor 符亚菲刘飞霍宗亮叶甜春
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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