Introduction to Xilinx Packaging Electronic packages are interconnectable housings for semiconductor devices. The major functions of the electronic packages are to provide electrical interconnections between the IC and the board and to efficiently remove heat generated by the device. Feature sizes are constantly shrinking, resulting in increased number of transistors being packed into the device. Today's submicron technology is also enabling large-scale functional integration and system-on-a-chip solutions. In order to keep pace with these new advancements in silicon technologies, semiconductor packages have also evolved to provide improved device functionality and performance. Feature size at the device level is driving package feature sizes down to the design rules of the early transistors. To meet these demands, electronic packages must be flexible to address high pin counts, reduced pitch and form factor requirements. At the same time,packages must be reliable and cost effective.
20世紀(jì)90年代中期,因使用ASIC實(shí)現(xiàn)芯片組受到啟發(fā),萌生應(yīng)該將完整計(jì)算機(jī)所有不同的功能塊一
次直接集成于一顆硅片上的想法。這種芯片,初始起名叫System on a Chip(SoC),直譯的中文名是
系統(tǒng)級(jí)芯片
數(shù)字存儲(chǔ)器和混合信號(hào)超大規(guī)模集成電路
本書(shū)系統(tǒng)地介紹了數(shù)字、存儲(chǔ)器和混合信號(hào)VLSI系統(tǒng)的測(cè)試和可測(cè)試性設(shè)計(jì)。該書(shū)是根據(jù)作者多年的科研成果和教學(xué)實(shí)踐,結(jié)合國(guó)際上關(guān)注的最新研究熱點(diǎn)并參考大量的文獻(xiàn)撰寫(xiě)的。全書(shū)共分三個(gè)部分。第一部分是測(cè)試基礎(chǔ),介紹了測(cè)試基本概念、測(cè)試設(shè)備、測(cè)試經(jīng)濟(jì)學(xué)和故障模型。第二部分是測(cè)試方法,詳細(xì)論述了組合和時(shí)序電路的測(cè)試生成、存儲(chǔ)器測(cè)試、基于DSP和基于模塊的模擬與混合信號(hào)測(cè)試、延遲測(cè)試和IDDQ測(cè)試等。第三部分是可測(cè)試性設(shè)計(jì),包括掃描設(shè)計(jì)、BIST、邊界掃描測(cè)試、模擬測(cè)試總線標(biāo)準(zhǔn)和基于IP芯核的SOC(System on a chip)測(cè)試。
提出了一個(gè)由AT89C52單片機(jī)控制步進(jìn)電機(jī)的實(shí)例。可以通過(guò)鍵盤(pán)輸入相關(guān)數(shù)據(jù), 并根據(jù)需要, 實(shí)時(shí)對(duì)步進(jìn)電機(jī)工作方式進(jìn)行設(shè)置, 具有實(shí)時(shí)性和交互性的特點(diǎn)。該系統(tǒng)可應(yīng)用于步進(jìn)電機(jī)控制的大多數(shù)場(chǎng)合。實(shí)踐表明, 系統(tǒng)性能優(yōu)于傳統(tǒng)的步進(jìn)電機(jī)控制器。關(guān)鍵詞: 單片機(jī); 步進(jìn)電動(dòng)機(jī); 直流固態(tài)繼電器; 實(shí)時(shí)控制Con trol System of Stepp ingMotor Ba sed on AT89C52 ChipM icrocomputerMENGWu2sheng, L ILiang (College of Automatization, Northwestern Polytechnical Unversity, Xipan 710072, China)ABSTRACT: A stepp ing motor control system based on AT89C52 chip microcomputer was described.The data can be inputwith keyboard, and stepp ingmotorwas controlled by these data. According to the demand, users can set the workingmodel of stepp ingmotor in real2time. This system can be widely used in stepp ing motor controlling. The p ractice showed that the performance of this system outdid the tradi tional stepp ing motor controller.KEY WORDS: Chip microcomputer; Stepp ingmotor; DCSSR; Real2time control
PCI.VHD, THE INTERFACE MODULE WITH PCI AGENT CHIP
--v1.0: For CY7C9689, First Version working on L01A chip
--V2.0: For simplified PCI Agent, Xilinx and AMD chips
1. 下列說(shuō)法正確的是 ( )
A. Java語(yǔ)言不區(qū)分大小寫(xiě)
B. Java程序以類為基本單位
C. JVM為Java虛擬機(jī)JVM的英文縮寫(xiě)
D. 運(yùn)行Java程序需要先安裝JDK
2. 下列說(shuō)法中錯(cuò)誤的是 ( )
A. Java語(yǔ)言是編譯執(zhí)行的
B. Java中使用了多進(jìn)程技術(shù)
C. Java的單行注視以//開(kāi)頭
D. Java語(yǔ)言具有很高的安全性
3. 下面不屬于Java語(yǔ)言特點(diǎn)的一項(xiàng)是( )
A. 安全性
B. 分布式
C. 移植性
D. 編譯執(zhí)行
4. 下列語(yǔ)句中,正確的項(xiàng)是 ( )
A . int $e,a,b=10
B. char c,d=’a’
C. float e=0.0d
D. double c=0.0f