• Title/Summary/Keyword: Synchronizer

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Reducing False Alarms in Schizophrenic Parallel Synchronizer Detection for Esterel (Esterel에서 동기장치 중복사용 문제 검출시 과잉 경보 줄이기)

  • Yun, Jeong-Han;Kim, Chul-Joo;Kim, Seong-Gun;Han, Tai-Sook
    • Journal of KIISE:Software and Applications
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    • v.37 no.8
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    • pp.647-652
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    • 2010
  • Esterel is an imperative synchronous language well-adapted to control-intensive systems. When an Esterel program is translated to a circuit, the synchronizer of a parallel statement may be executed more than once in a clock; the synchronizer is called schizophrenic. Existing compilers cure the problems of schizophrenic parallel synchronizers using logic duplications. This paper proposes the conditions under which a synchronizer causes no problem in circuits when it is executed more than once in a clock. In addition we design a detection algorithm based on those conditions. Our algorithm detects schizophrenic parallel synchronizers that have to be duplicated in Esterel source codes so that compilers can save the size of synthesized circuits

A Study on the Metastabel Phenomena and its Improvement Method in the Synchronizer (Synchronizer의 Metastable 현상 및 그의 개선 방법에 관한 연구)

  • 정연만;이종각
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.14 no.5
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    • pp.1-6
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    • 1977
  • When the input of synchronizer which is used for the purpose of synchronizing the master clock of computer with the interrupt system, a sort of random variable device, is gated with asynchronous intersection of the fall time of the master clock and the risetime oi the interrupt request, synchronizer is drived in Metastable region. This paper is presented circuit analysis of Metastable phenomena and analysis for transient process from metastable point to stable state, and also realities the collect logic with Inverter and open collector methods with a view to improving logic failure caused by the mishappen phenomena.

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Metastability-free Mesochronous Synchronizer for Networks on Chip (불안정 상태를 제거한 NoC용 위상차 클럭 동기회로)

  • Kim, Kang-Chul
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.16 no.6
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    • pp.1242-1249
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    • 2012
  • This paper proposes a metastability-free synchronization method and a mesochronous synchronizer for NoC. It uses the clock transmitted from TX as a strobe and solves the metastability problem by selecting one of rising or falling clock edge depending on the sampling value in RX when the phase difference between clocks is under a metastability window. The logic simulation results show that it works without metastability under $0^{\circ}{\sim}360^{\circ}$ phase difference in the synchronizer that a fault is inserted. The mesochronous synchronizer has a simple control logic and is suitable for NoC.

Low Complexity Synchronizer Using Common Autocorrelator for DVB-S2 System

  • Park, Jang-Woong;SunWoo, Myung-Hoon;Kim, Pan-Soo;Chang, Dae-Ig
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.9 no.4
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    • pp.181-186
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    • 2009
  • This paper presents an efficient synchronizer architecture using a common autocorrelator for Digital Video Broadcasting via Satellite, Second generation (DVB-S2). To achieve the required performance under the worst channel condition and to implement the efficient H/W resource utilization of functional synchronization blocks, we propose a new efficient common autocorrelator structure. The proposed architecture can decrease about 92% of multipliers and 81% of adders compared with the direct implementation. Moreover, the proposed architecture has been thoroughly verified in XilinxTM Virtex IV and R&STM SFU (Signaling and Formatting Unit) broad-cast test equipment.

An Analysis on the Affects of Friction Material and Force of Manual Transmission Synchronizer Ring (수동 변속기용 동기기구의 마찰력과 마찰재의 영향 분석)

  • Cho Yong-Ee;Yoon Jung-Hyun;You Kwang-Suk
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.15 no.2
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    • pp.44-50
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    • 2006
  • A driver's feelings of transmission serve as a basis to judge not only the transmission but also the entire automobile that he or she drives. The importance of transmission feelings is increasing daily because of driver's desire for increased torque and other improved functions. In order to accommodate such desire of drivers, new friction materials have been developed. The study in this report compared the affects of such materials and the force for transmission theoretically and empirically. By doing so, the study attempted to establish basic references for computation of capacity and other factors to be determined at the time of design of synchronizer system.

A Study for Shift Qulity and Durability of Manual Transmission Oil (MTM OIL의 변속성능과 내구성에 대한 연구)

  • Cha Sang Yeob;Yang Si Won
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2003.11a
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    • pp.185-190
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    • 2003
  • Synchronizer ring performance is strictly required in order to extend manual transmission oil drain interval. Zn type additive, which is used as dispersant and anti-wear additive instead of SP additives in manual transmission oil, is applied to improve Synchronizing function and durability. But only Zn type additive is not suitable for high torque transmission because it has not good extreme pressure characteristics. We research on the synchronizer friction and extreme pressure properties in according to change additive types. As a result, it was found that the use of non-active extreme pressure and friction modifier additives has benefit in the improvement of synchronizer friction characteristics and durability.

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The Bit Synchronizer of the Frequency Hopping System using The Error Symbol Detector (에러 심볼 검출기를 이용한 주파수 도약용 비트 동기방식)

  • Kim, Jung-Sup;Hwang, Chan-Sik
    • Journal of the Korean Institute of Telematics and Electronics S
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    • v.36S no.7
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    • pp.9-15
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    • 1999
  • In this paper, we propose a bit synchronizer which is suitable for frequency hopping systems. The proposed bit synchronizer is an ADPLL in which the digital loop filter is combined with an error symbol detecting circuit. Suppressing the tracking process, when hop mute and impulse noises are detected, improves the performance of the digital loop filter and enhances the probability of the frequency hopping system. Simulation results demonstrate an improved performance of the proposed bit synchronizer compared with existing ones.

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The Bit Synchronizer of The Frequency Hopping System using Adaptive Window Filter (적응윈도우 필터를 이용한 주파수 도약용 비트 동기방식)

  • 김정섭;황찬식
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.24 no.8B
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    • pp.1532-1539
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    • 1999
  • In this paper, we propose a bit synchronizer which is suitable for frequency hopping systems. The proposed bit synchronizer is an ADPLL in which the digial loop filter is combined with an error symbol detecting circuit using an adaptive window. Suppressing the tracking process when hop mute and impulse noises are detected improves the performance of the digital loop filter and enhances the probability of the frequency hopping system. The simulation results demonstrate an improved performance of the proposed bit synchronizer compared with existing ones.

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A Study on the Realization of a Digital Bit Synchronizer using the Gauss-Markov Estimation Technique (Gauss-Markov 추정 기법을 이용한 디지탈 비트 동기화기 실현에 관한 연구)

  • Bae, Hyeon-Deok;Ryu, Heung-Gyoon
    • The Journal of the Acoustical Society of Korea
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    • v.9 no.2
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    • pp.61-69
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    • 1990
  • We have investigated the digital bit synchronization problem in baseband communication receiver systems using the Gauss-Markov estimation technique which is equivalent to the weighted least square method. The realized bit synchronizer, including the data detector, processes the input signal two dimensionally into the transition phase and data level under the white Gaussian noise environment. We have confirmed the relization of the bit synchronizer via computer simulation. In addition, we have compared and evaluated the estimation error performance of the proposed method with that of the conventional DTTL method and of the minimum likelihood method.

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A Study on Measurement of Voltage Parameters using TEO&DESA in Auto-synchronizer (TEO&DESA를 활용한 Auto-synchronizer의 전압 파라미터 측정에 관한 연구)

  • Shin, Hoon-Chul;Han, Soo-Kyeong;Lyu, Joon-Soo;Cho, Soo-Hwan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.7
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    • pp.816-823
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    • 2018
  • The Auto-synchronizer is essential equipment for synchronizing a generator to the power system. It is performing that measurement of the magnitude, frequency and phase of the voltage signal of the power system and generator. It is important to select the appropriate measurement algorithm for preventing various problem such as mechanical stress and Electrical problem. Teager Energy Operator(TEO) and Discrete separation algorithm(DESA) is measurable the instantaneous parameters of a sine wave using 5 samples and can be measured at a fast and with a simple operation. Therefore it has many advantages in measuring the parameters. In this paper, it confirmed measurement results using matlab simulations when there are synchronized in order of frequency, magnitude. Also it presented methods using digital filters and sample intervals to improve accuracy.