Abstract: The process of designing a radio system can be complex and often involves many project tradeoffs. Witha Little insight, balancing these various characteristics can make the job of designing a radio system easier. Thistutorial explores these tradeoffs and provides details to consider for various radio applications. With a focus on theindustrial, scientific, medical (ISM) bands, the subjects of frequency selection, one-way versus two-way systems,modulation techniques, cost, antenna options, power-supply influences, effects on range, and protocol selectionare explored.
標簽: 無線
上傳時間: 2013-12-13
上傳用戶:eastgan
ARM7 是一種低電壓,通用32 位RISC 微處理器單元,可作一般應用或嵌入到ASIC 或CSIC中,其簡潔一流的設計特別適用于電源敏感的應用中。ARM7 的小尺寸使它特別適合集成到比較大的客戶芯片中,此芯片中也可以包含RAM, ROM, DSP,邏輯控制和其他代碼。 增強特性:ARM7 和ARM6 有相似性,但增加了以下功能:基于亞微米的制程,增加了速度,減少了電源消耗3V 操作,很小的電源消耗,并同5V 系統(tǒng)兼容較高的時鐘對所以程序執(zhí)行較快。特性總結(jié):l 32 位的RISC 結(jié)構(gòu)處理器(包括32 位地址線和數(shù)據(jù)線);l Little/Big Endian 操作模式;l 高性能RISC17 MIPS sustained @ 25 MHz (25 MIPS peak)@ 3Vl 較低的電壓損耗0.6mA/MHz@ 3V fabricated in .8 m CMOS全靜態(tài)操作l 適用于對電源比較敏感的應用中l(wèi) 快速中斷響應l 適用于實時系統(tǒng)l 支持虛擬內(nèi)存l 支持高級語言l 簡單但功能強大的指令系統(tǒng)
標簽: ARM7 數(shù)據(jù)手冊
上傳時間: 2013-10-24
上傳用戶:座山雕牛逼
ARM通訊 H-JTAG 是一款簡單易用的的調(diào)試代理軟件,功能和流行的MULTI-ICE 類似。H-JTAG 包括兩個工具軟件:H-JTAG SERVER 和H-FLASHER。其中,H-JTAG SERVER 實現(xiàn)調(diào)試代理的功能,而H-FLASHER則實現(xiàn)了FLASH 燒寫的功能。H-JTAG 的基本結(jié)構(gòu)如下圖1-1所示。 H-JTAG支持所有基于ARM7 和ARM9的芯片的調(diào)試,并且支持大多數(shù)主流的ARM調(diào)試軟件,如ADS、RVDS、IAR 和KEIL。通過靈活的接口配置,H-JTAG 可以支持WIGGLER,SDT-JTAG 和用戶自定義的各種JTAG 調(diào)試小板。同時,附帶的H-FLASHER 燒寫軟件還支持常用片內(nèi)片外FLASH 的燒寫。使用H-JTAG,用戶能夠方便的搭建一個簡單易用的ARM 調(diào)試開發(fā)平臺。H-JTAG 的功能和特定總結(jié)如下: 1. 支持 RDI 1.5.0 以及 1.5.1; 2. 支持所有ARM7 以及 ARM9 芯片; 3. 支持 THUMB 以及ARM 指令; 4. 支持 Little-ENDIAN 以及 BIG-ENDIAN; 5. 支持 SEMIHOSTING; 6. 支持 WIGGLER, SDT-JTAG和用戶自定義JTAG調(diào)試板; 7. 支持 WINDOWS 9.X/NT/2000/XP; 8.支持常用FLASH 芯片的編程燒寫; 9. 支持LPC2000 和AT91SAM 片內(nèi)FLASH 的自動下載;
標簽: H-JTAG 調(diào)試軟件
上傳時間: 2014-12-01
上傳用戶:Miyuki
ARM通訊 H-JTAG 是一款簡單易用的的調(diào)試代理軟件,功能和流行的MULTI-ICE 類似。H-JTAG 包括兩個工具軟件:H-JTAG SERVER 和H-FLASHER。其中,H-JTAG SERVER 實現(xiàn)調(diào)試代理的功能,而H-FLASHER則實現(xiàn)了FLASH 燒寫的功能。H-JTAG 的基本結(jié)構(gòu)如下圖1-1所示。 H-JTAG支持所有基于ARM7 和ARM9的芯片的調(diào)試,并且支持大多數(shù)主流的ARM調(diào)試軟件,如ADS、RVDS、IAR 和KEIL。通過靈活的接口配置,H-JTAG 可以支持WIGGLER,SDT-JTAG 和用戶自定義的各種JTAG 調(diào)試小板。同時,附帶的H-FLASHER 燒寫軟件還支持常用片內(nèi)片外FLASH 的燒寫。使用H-JTAG,用戶能夠方便的搭建一個簡單易用的ARM 調(diào)試開發(fā)平臺。H-JTAG 的功能和特定總結(jié)如下: 1. 支持 RDI 1.5.0 以及 1.5.1; 2. 支持所有ARM7 以及 ARM9 芯片; 3. 支持 THUMB 以及ARM 指令; 4. 支持 Little-ENDIAN 以及 BIG-ENDIAN; 5. 支持 SEMIHOSTING; 6. 支持 WIGGLER, SDT-JTAG和用戶自定義JTAG調(diào)試板; 7. 支持 WINDOWS 9.X/NT/2000/XP; 8.支持常用FLASH 芯片的編程燒寫; 9. 支持LPC2000 和AT91SAM 片內(nèi)FLASH 的自動下載;
標簽: H-JTAG 調(diào)試軟件
上傳時間: 2013-11-19
上傳用戶:水中浮云
A windows BMP file is a common image format that Java does not handle. While BMP images are used only on windows machines, they are reasonably common. Reading these shows how to read complex structures in Java and how to alter they byte order from the big endian order used by Java to the Little endian order used by the windows and the intel processor.
上傳時間: 2013-12-27
上傳用戶:gaojiao1999
只包括兩個核心文件sha1.cpp及sha1.h 計算數(shù)據(jù)的sha1摘要。簡單,好用。 由于bit endian及Little endian的原因,有些計算sha1摘要的算法計算出來的結(jié)果與正確結(jié)果有差異。此源碼經(jīng)過測試,與RFC里列出的測試結(jié)果匹配。
上傳時間: 2015-04-09
上傳用戶:dongqiangqiang
Although there has been a lot of AVL tree libraries available now, nearly all of them are meant to work in the random access memory(RAM). Some of them do provide some mechanism for dumping the whole tree into a file and loading it back to the memory in order to make data in that tree persistent. It serves well when there s just small amount of data. When the tree is somewhat bigger, the dumping/loading process could take a lengthy time and makes your mission-critical program less efficient. How about an AVL tree that can directly use the disk for data storage ? If there s something like that, we won t need to read through the whole tree in order to pick up just a Little bit imformation(a node), but read only the sectors that are neccssary for locating a certain node and the sectors in which that node lies. This is my initial motivation for writing a storage-media independent AVL Tree. However, as you step forth, you would find that it not only works fine with disks but also fine with memorys, too.
標簽: available libraries Although nearly
上傳時間: 2014-01-22
上傳用戶:zhoujunzhen
Far too many programmers and software designers consider efficient C++ to be an oxymoron. They regard C++ as inherently slow and inappropriate for performancecritical applications. Consequently, C++ has had Little success penetrating domains such as networking, operating system kernels, device drivers, and others.
標簽: programmers designers efficient consider
上傳時間: 2013-11-30
上傳用戶:zsjzc
Displays CPU time usage, the list of processes (can be terminated) and the task which are running (can be close or switch to). Plus a Little net traffic monitor and a disk status report.
標簽: terminated the processes Displays
上傳時間: 2013-12-25
上傳用戶:zgu489
Micro In-System Programmer Brief Installation Notes Enter the src directory. If uisp does not compile successfully, add switch -DNO_DIRECT_IO in the Makefile to remove support for direct I/O port access (that may be necessary on non-PC architectures). Parallel port access should still work if you have the Linux ppdev driver (patch for 2.2.17 is in the kernel directory, ppdev is standard in 2.4 kernels). Please lobby Alan Cox to include this tiny Little driver in 2.2.x too :). To make it type: make and to install it: make install If you have any further doubts, please consult UISP s homepage: http://www.nongnu.org/uisp/
標簽: Installation Programmer In-System directory
上傳時間: 2013-12-23
上傳用戶:小儒尼尼奧