This document was developed under the Standard Hardware and Reliability Program (SHARP) TechnologyIndependent Representation of Electronic Products (TIREP) project. It is intended for use by VHSIC HardwareDescription Language (VHDL) design engineers and is offered as guidance for the development of VHDL modelswhich are compliant with the VHDL Data Item Description (DID DI-EGDS-80811) and which can be providedto manufacturing engineering personnel for the development of production data and the subsequent productionof hardware. Most VHDL modeling performed to date has been concentrated at either the component level orat the conceptual system level. The assembly and sub-assembly levels have been largely disregarded. Under theSHARP TIREP project, an attempt has been made to help close this gap. The TIREP models are based upon lowcomplexity Standard Electronic Modules (SEM) of the format A configuration. Although these modules are quitesimple, it is felt that the lessons learned offer guidance which can readily be applied to a wide range of assemblytypes and complexities.
上傳時間: 2013-11-20
上傳用戶:pzw421125
FPGAs have changed dramatically since Xilinx first introduced them just 15 years ago. In thepast, FPGA were primarily used for prototyping and lower volume applications; custom ASICswere used for high volume, cost sensitive designs. FPGAs had also been too expensive and tooslow for many applications, let alone for System Level Integration (SLI). Plus, the development
標簽: Methodology Design Reuse FPGA
上傳時間: 2013-11-01
上傳用戶:shawvi
數(shù)字與模擬電路設(shè)計技巧IC與LSI的功能大幅提升使得高壓電路與電力電路除外,幾乎所有的電路都是由半導(dǎo)體組件所構(gòu)成,雖然半導(dǎo)體組件高速、高頻化時會有EMI的困擾,不過為了充分發(fā)揮半導(dǎo)體組件應(yīng)有的性能,電路板設(shè)計與封裝技術(shù)仍具有決定性的影響。 模擬與數(shù)字技術(shù)的融合由于IC與LSI半導(dǎo)體本身的高速化,同時為了使機器達到正常動作的目的,因此技術(shù)上的跨越競爭越來越激烈。雖然構(gòu)成系統(tǒng)的電路未必有clock設(shè)計,但是毫無疑問的是系統(tǒng)的可靠度是建立在電子組件的選用、封裝技術(shù)、電路設(shè)計與成本,以及如何防止噪訊的產(chǎn)生與噪訊外漏等綜合考慮。機器小型化、高速化、多功能化使得低頻/高頻、大功率信號/小功率信號、高輸出阻抗/低輸出阻抗、大電流/小電流、模擬/數(shù)字電路,經(jīng)常出現(xiàn)在同一個高封裝密度電路板,設(shè)計者身處如此的環(huán)境必需面對前所未有的設(shè)計思維挑戰(zhàn),例如高穩(wěn)定性電路與吵雜(noisy)性電路為鄰時,如果未將噪訊入侵高穩(wěn)定性電路的對策視為設(shè)計重點,事后反復(fù)的設(shè)計變更往往成為無解的夢魘。模擬電路與高速數(shù)字電路混合設(shè)計也是如此,假設(shè)微小模擬信號增幅后再將full scale 5V的模擬信號,利用10bit A/D轉(zhuǎn)換器轉(zhuǎn)換成數(shù)字信號,由于分割幅寬祇有4.9mV,因此要正確讀取該電壓level并非易事,結(jié)果造成10bit以上的A/D轉(zhuǎn)換器面臨無法順利運作的窘境。另一典型實例是使用示波器量測某數(shù)字電路基板兩點相隔10cm的ground電位,理論上ground電位應(yīng)該是零,然而實際上卻可觀測到4.9mV數(shù)倍甚至數(shù)十倍的脈沖噪訊(pulse noise),如果該電位差是由模擬與數(shù)字混合電路的grand所造成的話,要測得4.9 mV的信號根本是不可能的事情,也就是說為了使模擬與數(shù)字混合電路順利動作,必需在封裝與電路設(shè)計有相對的對策,尤其是數(shù)字電路switching時,ground vance noise不會入侵analogue ground的防護對策,同時還需充分檢討各電路產(chǎn)生的電流回路(route)與電流大小,依此結(jié)果排除各種可能的干擾因素。以上介紹的實例都是設(shè)計模擬與數(shù)字混合電路時經(jīng)常遇到的瓶頸,如果是設(shè)計12bit以上A/D轉(zhuǎn)換器時,它的困難度會更加復(fù)雜。
上傳時間: 2014-02-12
上傳用戶:wenyuoo
UART 4 UART參考設(shè)計,Xilinx提供VHDL代碼 uart_vhdl This zip file contains the following folders: \vhdl_source -- Source VHDL files: uart.vhd - top level file txmit.vhd - transmit portion of uart rcvr.vhd - - receive portion of uart \vhdl_testfixture -- VHDL Testbench files. This files only include the testbench behavior, they do not instantiate the DUT. This can easily be done in a top-level VHDL file or a schematic. This folder contains the following files: txmit_tb.vhd -- Test bench for txmit.vhd. rcvr_tf.vhd -- Test bench for rcvr.vhd.
標簽: UART Xilinx VHDL 參考設(shè)計
上傳時間: 2013-11-02
上傳用戶:18862121743
The revolution of automation on factory floors is a key driver for the seemingly insatiable demand for higher productivity, lower total cost of ownership,and high safety. As a result, industrial applications drive an insatiable demand of higher data bandwidth and higher system-level performance. This white paper describes the trends and challenges seen by designers and how FPGAs enable solutions to meet their stringent design goals.
標簽: xilinx FPGAs 工業(yè) 中的應(yīng)用
上傳時間: 2013-11-08
上傳用戶:yan2267246
三菱編程,包含組網(wǎng)通信,1:N,N:N,1:1 ,C-C LINK.
上傳時間: 2013-10-13
上傳用戶:neu_liyan
SWIFT 提供的服務(wù) 1、接入服務(wù) SWIFT的接入服務(wù)通過SWIFTAlliance的系列產(chǎn)品完成,包括: (1) SWIFTAlliance Access and Entry:傳送FIN信息的接口軟件; (2) SWIFTAlliance Gateway:接入SWIFTNet的窗口軟件; (3) SWIFTAlliance Webstation:接入SWIFTNet的桌面接入軟件; (4) File Transfer Interface:文件傳輸接口軟件,通過SWIFTNet FileAct是用戶方便的訪問其后臺辦公系統(tǒng)。 SWIFTNET Link軟件內(nèi)嵌在SWIFTAlliance Gateway和SWIFTAlliance Webstation中,提供傳輸、標準化、安全和管理服務(wù)。連接后,它確保用戶可以用同一窗口多次訪問SWIFTNet,獲得不同服務(wù)。
上傳時間: 2013-12-22
上傳用戶:sclyutian
Linux PCMCIA Card Services - Linux support for PCMCIA and CardBus devices, including kernel services, client drivers, and user-level utilities.
標簽: PCMCIA Linux including Services
上傳時間: 2014-01-18
上傳用戶:tyler
用匯編編寫的河內(nèi)塔程序 將第一柱a上n-1個盤借助第二柱c移到第三柱b 把a上剩下的一個盤移到c 將n-1個盤從b借助a移到第三柱c 這三步是圖示河內(nèi)塔的根本方法 功能一:自己動手移動河內(nèi)塔 先按左右鍵選擇要移的盤,按箭頭上鍵確定 再按左右鍵移到要的盤 如此,再根據(jù)河內(nèi)塔的規(guī)則確定較好的次數(shù)step2 功能二:圖示河內(nèi)塔移動過程 根據(jù)河內(nèi)塔的基本方法,確定圖象,按任意鍵選下一步,(開始時輸入level)
上傳時間: 2015-01-10
上傳用戶:chenbhdt
小型加減乘除計數(shù)器-ASM程序,包含LINK.EXE,MASM.EXE.
上傳時間: 2014-01-09
上傳用戶:leehom61
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