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技术资料 STM32H7的FMC外设在D_Cache使能的情况下运行不正常
前段时间接到一个客户的问题。客户描述在使用STM32H7的FMC时，如果使能了DCACHE，就运行不正常。数据没有写到FMC外部的存储器里，测量FMC接口也没有波形跳变。而不使能DCACHE工作就是正常的。 其实对于这个问题，如果了解STM32H7的架构的话，就很容易理解了。下面我们就来看一看到底是什么原因让客户觉得使能DCACHE后FMC就 ...
技术资料 电工基础知识入门
现实生活中，我们经常听到或说起很多有关电方面的名词、术语，也经常有很多用电方面的困惑。这些名词、术语究竟是怎样定义的?它们之间有什么关系?是什么因素导致电压的高低、电流的大小?为什么会发生由用电引发的火灾?为什么家里几个月没人住，还会产生电费?很多经常听到的，看似简单，又不容易说清的问题，通过本章的学习 ...
技术资料 CPCI_E标准规范 CompactPCI® Express Specification
CPCI_E标准规范 CompactPCI® Express SpecificationThe documents in this section may be useful for reference when reading the specification. The  revision listed for each document is the latest revision at the time this specification was published.  Newer revisions of these documents may exi ...
无线通信 射频基础知识
Radio frequency (RF) can be a complex subject to navigate, but it does not have to be. If you are just getting started with radios or maybe you cannot find that old reference book about antenna aperture, this guide can help. It is intended to provide a basic understanding of RF technology, as well a ...
可编程逻辑 XAPP444 - CPLD配件,技巧和窍门
Most designers wish to utilize as much of a device as possible in order to enhance the overallproduct performance, or extend a feature set. As a design grows, inevitably it will exceed thearchitectural limitations of the device. Exactly why a design does not fit can sometimes bedifficult to determ ...
微处理器开发 his project was built and tested with WinAVR-20060125. Make sure the MCU target define in the Mak
his project was built and tested with WinAVR-20060125.
Make sure the MCU target define in the Makefiles corresponds to the AVR you are using!!
To build the code, just install WinAVR and run "make" from the console in echomaster and
echoslave subdirs.
"make program" will program the device if yo ...
软件设计/软件工程 Java Regex Primer Since version 1.4, Java has had support for Regular Expressions in the core API. J
Java Regex Primer Since version 1.4, Java has had support for Regular Expressions in the core API. Java Regex follows the same basic principles used in other languages, just withdi erent access methods, and some subtledi erences with the patterns. This primer is aimed towards developers already fami ...
驱动编程 a sample WDM stream class video capture driver that supports two IEEE 1394 digital cameras. The sam
a sample WDM stream class video capture driver that supports two IEEE 1394 digital cameras.
The same driver may be able to support other digital cameras that conform to 1394-based Digital Camera Specification from 1394 Trade Association.
Digital camera supported by dcam.sys is a data source that pr ...
matlab例程 外国人开发的电磁时域有限差分方法工具包 Electromagnetic Finite-Difference Time-Domain (EmFDTD) is a basic two-dimensio
外国人开发的电磁时域有限差分方法工具包
Electromagnetic Finite-Difference Time-Domain (EmFDTD)
is a basic two-dimensional FDTD code developed at the
School of Electrical Engineering, Sharif University of
Technology.
This code has been written based on the standard
Yee s FDTD algorithm. Applicati ...
Linux/Unix编程 Free open-source disk encryption software for Windows Vista/XP, Mac OS X, and Linux Main Features:
Free open-source disk encryption software for Windows Vista/XP, Mac OS X, and Linux
Main Features:
* Creates a virtual encrypted disk within a file and mounts it as a real disk.
* Encrypts an entire partition or storage device such as USB flash drive or hard drive.
* Encrypts a partition or dr ...