電子書-RTL Design Style Guide for Verilog HDL540頁A FF having a fixed input value is generated from the description in the upper portion of Example 2-21. In this case, ’0’ is output when the reset signal is asynchronously input, and ’1’ is output when the START signal rises. Therefore, the FF data input is fixed at the power supply, since the typical value ’1’ is output following the rise of the START signal. When FF input values are fixed, the fixed inputs become untestable and the fault detection rate drops. When implementing a scan design and converting to a scan FF, the scan may not be executed properl not be executed properly, so such descriptions , so such descriptions are not are not recommended. recommended.[1] As in the lower part of Example 2-21, be sure to construct a synchronous type of circuit and ensure that the clock signal is input to the clock pin of the FF. Other than the sample shown in Example 2-21, there are situations where for certain control signals, those that had been switched due to the conditions of an external input will no longer need to be switched, leaving only a FF. If logic exists in a lower level and a fixed value is input from an upper level, the input value of the FF may also end up being fixed as the result of optimization with logic synthesis tools. In a situation like this, while perhaps difficult to completely eliminate, the problem should be avoided as much as possible.
標簽： RTL verilog hdl
上傳時間： 2022-03-21
上傳用戶：canderile
針對嵌入式產品程序更新問題,提出了一種基于IAP技術的STM32單片機在線固件升級方案,設計了STM32單片機最小系統硬件電路和USB轉串口通信電路,并給出了Bootloader程序、APP程序、PC上機程序的實現流程.實驗結果表明,該方案具有簡單實用、穩定性高、維護成本低和設備使用效率高的特點,適用于嵌入式產品升級.For the problem of updating embedded products program,an online firmware upgrade scheme of STM32 single chip microcomputer based on IAP technology is proposed.This scheme not only elaborates the principle of IAP technology in detail but also provides the design of the minimum system hardware circuit of STM32 MCU,the design of USB for serial communication circuit,and the implementation flow of Bootloader program,APP program and PC program.The experiment results show that the scheme is simple,practical and highly stable.In addition,it can be used to actual embedded product upgrading,significantly reducing maintenance costs and improving the efficiency of equipment.
上傳時間： 2022-03-25
上傳用戶：
電學中的測量技術涉及范圍非常廣,電流測量在電學計量中占有非常重要的位置。如何精確地進行電流測量是精密測量的一大難題。傳統的電流檢測電路多采用運算放大芯片與片外電流檢測電路相結合的方式,電路集成度很低,需要較多的接口和資源才能完成對電路的檢測。本文把所有電路部分都集成在一塊芯片上,包括檢測電阻,運算放大器電路及模擬轉數字轉換電路,從而在電路內部可以進行電流檢測,使電路更好的集成化。前置電路使用二級共源共柵結構的運算放大器,減小溝道長度調制效應造成的電流誤差。10位SAR ADC中采用電容驅動能力強的傳輸門保證了模數轉化器的有效精度。比較器模塊采用再生鎖存器與遲滯比較器作為基礎單元組合解決精密測量的問題。本設計可以作為嵌入芯片內的一小部分而檢測芯片中的微小電流1mA~100mA,工作電壓在1.8v左右,電流檢測精度預期達到10uA的需求。The measurement technology in electricity involves a wide range,and current measurement plays a very important position in electrical measurement.How to accurately measure current is a big problem in precision measurement. The traditional current detecting circuit adopts the combination of the operational amplifier chip and theoff-chip current detecting circuit, The circuit integration is very low, and more interfaces and resources are needed tocomplete the circuit detection.This topic integrates all the circuit parts into one chip, including detection resistance, operational amplifier circuit andanalog to digital conversion circuit. Highly integrated circuit makes the external resources on the chip more intensive,so that current detection can be carried out inside the circuit, so that the circuit can be better integrated. Thefront-end circuit of this project uses two-stage cascade operational amplifier and cascade tube to reduce the currenterror caused by channel length modulation effect. In 10-bit SAR ADC, the transmission gate with strong capacitivedriving ability ensures the effective accuracy of the analog-to-digital converter. Comparator module uses regenerativelatch and hysteresis comparator as basic unit to solve the difficult problem of precision measurement. This topic can beused as a small part of the embedded chip to detect the micro-current in the chip 1 mA~100 mA, the working voltageis about 1.8v, and the current detection accuracy is expected to reach the requirement of 10 uA.
上傳時間： 2022-04-03
上傳用戶：
本文首次設計并驗證了基于macom三合一芯片設計的光模塊電路,該電路旨在提供一種滿足SFF-8472中規定的數字診斷功能的低成本SFP+模塊。電路采用激光器驅動、限幅放大器、控制器以及時鐘恢復單元集成的單芯片,在保證高精度數字診斷功能基礎上,實現了低成本高可靠的特點。該電路在光接收接口組件與激光器驅動和限幅放大器單元的限幅放大器部分之間接入濾波器來提高模塊的靈敏度及信號質量。在控制器單元的數字電位器的引腳上采用外加電阻的方式避免出現上電不發光的故障問題。該研究結果為下一代SFP-DD光模塊設計與開發工作,奠定了一定的理論與實踐基礎。This paper designs and validates the optical module circuit based on the MACOM Trinity chip for the first time.This circuit aims to provide a low-cost SFP module which meets the digital diagnosis function specified in SFF-8472.The circuit uses a single chip integrated with laser driver,limiting amplifier,controller and clock recovery unit.On the basis of ensuring high precision digital diagnosis function,it achieves the characteristics of low cost and high reliability.The circuit connects a filter between the optical receiving interface module and the limiting amplifier part of the laser driver and limiting amplifier unit to improve the sensitivity and signal quality of the module.The pin of the digital potentiometer in the controller unit is equipped with an external resistance to avoid the problem of power failure.The research results lay a theoretical and practical foundation for optical module design in high-speed data center.
上傳時間： 2022-04-03
上傳用戶：
實驗教學一直是工科教學中不可或缺的組成部分,對培養學生的動手能力,獨立思考能力,創新思維與發散思維具有重要的作用。針對目前電路教學實驗中電路仿真實驗與實物電路實驗各自獨立,無法統一問題,提出將仿真電路實驗與實物電路實驗有機的結合同步操作,并使用Web發布實現遠程實驗操作。采用Multisim作為電路實驗仿真平臺,NI Eiviss II作為實物電路實驗硬件平臺,運用LabVIEW整合Multisim電路仿真實驗與實物電路實驗,實現仿真與實物實驗有機結合,兩種實驗可同步進行。學生在仿真實驗中先可探索實驗,然后做實物實驗。同時運用LabVIEW開發出實驗過程人機交互操作接口界面,使用過程中效果良好。Experimental teaching has always been an indispensable part of engineering education.And it always plays an important role in cultivating students'practical ability,independent thinking ability,innovative thinking and divergent thinking.But simulation experiment and physical experiment cannot be unified in the circuit teaching experiment at present.In order to solve this problem,this paper proposes to combine organically the simulation circuit experiment with physical circuit experiment,and synchronously operate them.This paper uses the WEB publishing to achieve remote experimental operation.Multisim is used as the circuit simulation platform,and NI Eiviss II is used as the physical circuit hardware platform.Multisim circuit simulation experiment and physical circuit experiment are implemented by LabVIEW to realize the combination of simulation experiment and physical experiment.Students do explore experiments in simulation experiment firstly,and then do physical experiment.And this paper uses LabVIEW to develop the experimental man-machine interface.
上傳時間： 2022-04-05
上傳用戶：
為解決移相全橋電路驅動及相角控制問題,設計了一種數字控制的移相全橋驅動電路.以TPL521為光耦隔離、IR2110為柵極驅動芯片.由DSP產生PWM信號,經過光耦隔離和邏輯電路后送至IR2110進行相角控制.文章對IR2110驅動電路原理進行分析及參數進行設計,對TMS320F28335進行設置并給出部分代碼.實驗結果表明：通過TMS320F28335可產生的不同相角的PWM波形,滿足了移相全橋對不同相角控制的要求.In order to solve the problem of phase-shifted full-bridge circuit driving and phase angle control,a digitally controlled phaseshifted full-bridge driving circuit was designed. TPL521 optocoupler isolation,IR2110 gate driver chip. PWM signals are generated by the DSP and sent to the IR2110 for phase angle control after optocoupler isolation and logic circuits. This text carries on the analysis to the principle of IR2110 drive circuit and parameter design,set up and give out some code to TMS320F28335. The experimental results show that the PWM waveforms with different phase angles generated by TMS320F28335 can meet the requirements of phase-shifted full-bridge control for different phase angles.
上傳時間： 2022-05-03
上傳用戶：zhanglei193
PCB工藝設計系列之華碩內部的PCB設計規范1. 問題描述(PROBLEM DESCRIPTION)為確保產品之制造性, R&D在設計階段必須遵循Layout相關規范, 以利制造單位能順利生產, 確保產品良率, 降低因設計而重工之浪費. “PCB Layout Rule” Rev1.60 (發文字號： MT-8-2-0029)發文后, 尚有訂定不足之處, 經補充修正成“PCB Layout Rule” Rev1.70. PCB Layout Rule Rev1.70, 規范內容如附件所示, 其中分為:(1) ”PCB LAYOUT 基本規范”:為R&D Layout時必須遵守的事項, 否則SMT,DIP,裁板時無法生產.(2) “錫偷LAYOUT RULE建議規范”: 加適合的錫偷可降低短路及錫球.(3) “PCB LAYOUT 建議規范”:為制造單位為提高量產良率,建議R&D在design階段即加入PCB Layout.(4) ”零件選用建議規范”: Connector零件在未來應用逐漸廣泛, 又是SMT生產時是偏移及置件不良的主因,故制造希望R&D及采購在購買異形零件時能顧慮制造的需求, 提高自動置件的比例.(5) “零件包裝建議規范”:,零件taping包裝時, taping的公差尺寸規范,以降低拋料率.
標簽： pcb工藝
上傳時間： 2022-07-22
上傳用戶：fliang
VIP專區-嵌入式/單片機編程源碼精選合集系列（105）資源包含以下內容：1. 凌陽公司機sunplus1002在這個芯片下.2. 基于pdiusbd12的c51單片機驅動程序.3. 凌陽公司機sunplus1002在這個芯片做為機頂盒主芯片下的嵌入式字體庫。.4. 常見datasheet中文版--- 很多人不大習慣讀英文的datasheet.5. 倒車雷達系統的研究與設計：系統設計中采用了模塊設計思想.6. TMS320VC5509設備端USB設備驅動程序源文件.7. 利用51單片機控制步進電機并顯示當前轉速.8. 5920是PCI橋芯片,節省了許多用于處理PCI通訊細節的開發時間.這個是相關資料.9. XILINX專用術語,中文,很好的規范教材,可以方便新人能較快的入門.10. 嵌入式的一本好書.11. 該文件中包括89系列 X102開發板的12232液晶屏AD轉換器ADC0809,DA轉換器DAC0832,I2C總線芯片24C02,RAM電路62256,發光二極管電路.12. “霓虹燈”小程序.13. 三星公司S3C2410X中文數據手冊完全版.14. 此程序下位機采集18部0溫度.15. 運行環境:DOS, 通過串口升級的下位程序, 需配合上位升級程序FileUpgrade運行, 可用于嵌入式DOS系統中..16. 在電路中選擇運算放大器(運放)來實現某一特定功能時.17. 嵌入式DOS系統上位升級程序FileUpgrade, 需配合本人上傳的FileUpr程序應用, VC++開發, 非常實用, 內附說明及源碼.18. 步進電機的控制程序.19. moden控制器電路設計.20. dsPICDEM_v1_1開發板的相關例程.21. 程序在visual c＋＋環境下實現了圖像按照輸入參數進行平移旋轉和在水平垂直方向上的鏡像功能。.22. Develop Zigbee network real-time Os.23. AT89C51+CPLD 的EPM7064SLC44-10的學習板電路圖.24. LSVMK Langrangian Support Vector Machine algorithm LSVMK solves a support vector machine problem us.25. 網上尋找的.26. 介紹了關于怎樣用DRAM 芯片用做 攝象機.27. s3c2410的背光源碼.28. s3c2410的觸摸屏源碼.29. 嵌入式系統軟件結構設計 基于uc/os- 2的軟件設計.30. 嵌入式實時操作系統分析 uc/os-2操作系統內核的分析.31. 24C02的讀與寫.32. 學習開源gui庫wxwidgets的入門源碼.33. 2812的ad的詳細說明.34. LED顯示屏設計LED顯 示屏設計 LED顯示屏設計 LED顯示屏設計 LED顯示屏設計.35. mc68hc08 tim 試驗程序實例.36. 附帶圖形界面的2410Flash燒寫程序.37. OrCAD格式的2410開發板 底板原理圖.38. OrCAD格式的S3C2410X核心板原理圖.39. H_323協議詳解（中文） 打開文件的密碼是:21315038.40. stc單片機讀內部eeprom代碼.
標簽： 激光測量
上傳時間： 2013-04-15
上傳用戶：eeworm
