FPGA(Field Programmable Gate Arrays)是目前廣泛使用的一種可編程器件，FPGA的出現使得ASIC(Application Specific Integrated Circuits)產品的上市周期大大縮短，并且節省了大量的開發成本。目前FPGA的功能越來越強大，滿足了目前集成電路發展的新需求，但是其結構同益復雜，規模也越來越大，內部資源的種類也R益豐富，但同時也給測試帶來了困難，FPGA的發展對測試的要求越來越高，對FPGA測試的研究也就顯得異常重要。 本文的主要工作是提出一種開關盒布線資源的可測性設計，通過在FPGA內部加入一條移位寄存器鏈對開關盒進行配置編程，使得開關盒布線資源測試時間和測試成本減少了99％以上，而且所增加的芯片面積僅僅在5％左右，增加的邏輯資源對FPGA芯片的使用不會造成任何影響，這種方案采用了小規模電路進行了驗證，取得了很好的結果，是一種可行的測試方案。 本文的另一工作是采用一種FPGA邏輯資源的測試算法對自主研發的FPGA芯片FDP250K的邏輯資源進行了嚴格、充分的測試，從FPGA最小的邏輯單元LC開始，首先得到一個LC的測試配置，再結合SLICE內部兩個LC的連接關系得到一個SLICE邏輯單元的4種測試配置，并且采用陣列化的測試方案，同時測試芯片內部所有的邏輯單元，使得FPGA內部的邏輯資源得完全充分的測試，測試的故障覆蓋率可達100％，測試配置由配套編程工具產生，測試取得了完滿的結果。
上傳時間： 2013-06-29
上傳用戶：Thuan
本文論述了狀態機的verilog編碼風格,以及不同編碼風格的優缺點，Steve Golson's 1994 paper, "State Machine Design Techniques for Verilog and VHDL" [1], is agreat paper on state machine design using Verilog, VHDL and Synopsys tools. Steve's paper alsooffers in-depth background concerning the origin of specific state machine types.This paper, "State Machine Coding Styles for Synthesis," details additional insights into statemachine design including coding style approaches and a few additional tricks.
標簽： Synthesis Machine Coding Styles
上傳時間： 2013-10-15
上傳用戶：dancnc
Abstract: Perfection is relative and application specific. The perfect race car is not the car we use to commute to work. We need products for everyday use that are high quality, affordable, and solidly reliable. There will be times when we must use components that are not perfect, and this is when calibration becomes important. Calibration techniques reduce tolerances in imperfect manufacturing equipment while maintaining affordability.
標簽： 校準
上傳時間： 2013-10-09
上傳用戶：哈哈hah
Who has never experienced oscillations issues when using an operational amplifier? Opampsare often used in a simple voltage follower configuration. However, this is not the bestconfiguration in terms of capacitive loading and potential risk of oscillations.Capacitive loads have a big impact on the stability of operational amplifier-basedapplications. Several compensation methods exist to stabilize a standard op-amp. Thisapplication note describes the most common ones, which can be used in most cases.The general theory of each compensation method is explained, and based on this, specific
上傳時間： 2013-10-28
上傳用戶：chenbhdt
The Reactor design pattern handles service requests that are delivered concurrently to an application by one or more clients. Each service in an application may consist of serveral methods and is represented by a separate event handler that is responsible for dispatching service-specific requests.
上傳時間： 2013-10-15
上傳用戶：libinxny
Radio Frequency Integrated Circuit Design I enjoyed reading this book for a number of reasons. One reason is that itaddresses high-speed analog design in the context of microwave issues. This isan advanced-level book, which should follow courses in basic circuits andtransmission lines. Most analog integrated circuit designers in the past workedon applications at low enough frequency that microwave issues did not arise.As a consequence, they were adept at lumped parameter circuits and often notcomfortable with circuits where waves travel in space. However, in order todesign radio frequency (RF) communications integrated circuits (IC) in thegigahertz range, one must deal with transmission lines at chip interfaces andwhere interconnections on chip are far apart. Also, impedance matching isaddressed, which is a topic that arises most often in microwave circuits. In mycareer, there has been a gap in comprehension between analog low-frequencydesigners and microwave designers. Often, similar issues were dealt with in twodifferent languages. Although this book is more firmly based in lumped-elementanalog circuit design, it is nice to see that microwave knowledge is brought inwhere necessary.Too many analog circuit books in the past have concentrated first on thecircuit side rather than on basic theory behind their application in communications.The circuits usually used have evolved through experience, without asatisfying intellectual theme in describing them. Why a given circuit works bestcan be subtle, and often these circuits are chosen only through experience. Forthis reason, I am happy that the book begins first with topics that require anintellectual approach—noise, linearity and filtering, and technology issues. Iam particularly happy with how linearity is introduced (power series). In therest of the book it is then shown, with specific circuits and numerical examples,how linearity and noise issues arise.
上傳時間： 2014-12-23
上傳用戶：han_zh
Many complex systems—such as telecom equipment,memory modules, optical systems, networking equipment,servers and base stations—use FPGAs and otherdigital ICs that require multiple voltage rails that muststart up and shut down in a specific order, otherwise theICs can be damaged. The LTC®2924 is a simple andcompact solution to power supply sequencing in a 16-pinSSOP package (see Figures 1 and 2).
上傳時間： 2013-10-29
上傳用戶：tonyshao
Switching regulators are of universal interest. LinearTechnology has made a major effort to address this topic.A catalog of circuits has been compiled so that a designengineer can swiftly determine which converter type isbest. This catalog serves as a visual index to be browsedthrough for a specific or general interest.
標簽： Collection Switching Regulator Circuit
上傳時間： 2013-11-09
上傳用戶：mh_zhaohy
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標簽： 數字電源
上傳時間： 2013-10-16
上傳用戶：dddddd
針對目前使用的RS232接口數字化B超鍵盤存在PC主機啟動時不能設置BIOS，提出一種PS2鍵盤的設計方法。基于W78E052D單片機，采用8通道串行A/D轉換器設計了8個TGC電位器信息采集電路，電位器位置信息以鍵盤掃描碼序列形式發送，正交編碼器信號通過XC9536XL轉換為單片機可接收的中斷信號，軟件接收到中斷信息后等效處理成按鍵。結果表明，在滿足開機可設置BIOS同時，又可實現超聲特有功能，不需要專門設計驅動程序，接口簡單，成本低。 Abstract: Aiming at the problem of the digital ultrasonic diagnostic imaging system keyboard with RS232 interface currently used couldn?蒺t set the BIOS when the PC boot， this paper proposed a design method of PS2 keyboards. Based on W78E052D microcontroller，designed eight TGC potentiometers information acquisition circuit with 8-channel serial A/D converter， potentiometer position information sent out with keyboard scan code sequentially.The control circuit based on XC9536 CPLD is used for converting the mechanical actions of the encoders into the signals that can be identified by the MCU， software received interrupt information and equivalently treatmented as key. The results show that the BIOS can be set to meet the boot， ultrasound specific functionality can be achieved at the same time， it does not require specially designed driver，the interface is simple and low cost.
上傳時間： 2013-10-10
上傳用戶：asdfasdfd
