Let the following relational tables be given: R = (A, B, C) and S = (D, E, F) where A, B, C, D, E, and F are the attributes (columns). Write the SQL statements that will express each of the queries given below:
標(biāo)簽: relational following tables given
上傳時(shí)間: 2014-01-14
上傳用戶:cx111111
SOPC實(shí)驗(yàn)--自定義PWM組件:以帶一個(gè)Avalon Slave 接口的PWM 組件為例,說明如何自定義組件。,一個(gè)Avalon Slave 接口可以有clk、chipselect、address、read、readdata、write 及writedata 等信號(hào),但這些信號(hào)都不是必需的。 一、功能 我們要實(shí)現(xiàn)的PWM 組件具有以下功能: 1. PWM 的周期可改,用period 寄存器存儲(chǔ); 2. PWM 的占空比可改,用duty 寄存器存儲(chǔ)。 二、Avalon Slave 接口信號(hào)的設(shè)計(jì) 1.Clk:為PWM 提供時(shí)鐘; 2.Write:寫信號(hào),可以通過Avalon Slave 總線將period 和duty 值從Nios II 應(yīng)用程序 傳送到組件邏輯中。 3.Writedata:寫數(shù)據(jù)。通過此數(shù)據(jù)線傳送period 和duty 值。 4.Address:本例中有兩個(gè)寄存器,因此可用一根地址線表示。 5.全局信號(hào)。本例中PWM 的輸出用來驅(qū)動(dòng)LED 燈顯示,這個(gè)信號(hào)不屬于Avalon 接 口信號(hào)。
標(biāo)簽: PWM Avalon Slave SOPC
上傳時(shí)間: 2013-12-28
上傳用戶:bibirnovis
為L(zhǎng)INUX設(shè)計(jì)一個(gè)簡(jiǎn)單的二級(jí)文件系統(tǒng)。要求做到以下幾點(diǎn): 1、 可以實(shí)現(xiàn)下列幾條命令 Login 用戶登錄 Dir 列文件目錄 Create 創(chuàng)建文件 Delete 刪除文件 Open 打開文件 Close 關(guān)閉文件 Read 讀文件 Write 寫文件 2、列目錄時(shí)要列出文件名、物理地址、保護(hù)碼和文件長(zhǎng)度。 3、源文件可以進(jìn)行讀寫保護(hù)。
標(biāo)簽: Create Delete LINUX Login
上傳時(shí)間: 2016-07-16
上傳用戶:jeffery
三星公司官方JTAG下載工具SJF2440源代碼下載。SJF2440 can program SMDK2440 flash memory (K9S1208,Intel E28F128,AMD29LV800BB) through JTAG port and read/write data from/to a specified address.
標(biāo)簽: 2440 SJF program memory
上傳時(shí)間: 2014-01-20
上傳用戶:腳趾頭
.ifnz I2C_SUPPORT ************************************************************** Function : fProcessI2cRead Description : process I2C write function Input : IOP_DATA1_H=rCtrlByte,IOP_DATA1_L=rAddr Output : NONE ************************************************************** fProcessI2cRead: fetch parameter lda IOP_DATA1_H sta rCtrlByte lda IOP_DATA1_L sta rAddr jsr fI2cSendCmdAddr bcs lReadI2CFail
標(biāo)簽: C_SUPPORT Function ifnz fPro
上傳時(shí)間: 2016-07-21
上傳用戶:xaijhqx
MT: windows NT/2000/XP command line tape manipulation written to format a tape windows-XP backup refused to write or format... and satisfy my curiosity Can be used for crude data recovery (combine seek and read)
標(biāo)簽: tape manipulation windows-XP windows
上傳時(shí)間: 2013-12-23
上傳用戶:tb_6877751
Over the past years, we have witnessed destructions of various kinds caused by human actions. As a university student, write a letter to our society to
標(biāo)簽: destructions witnessed actions various
上傳時(shí)間: 2014-11-23
上傳用戶:一諾88
C++ Footprint and Performance Optimization contains case studies and sample code to give readers concrete examples and proven solutions to problems that don t have cut and paste solutions. The market for miniature computer programming is exploding. C++ Footprint and Performance Optimization supplies programmers the knowledge they need to write code for the increasing number of hand-held devices, wearable computers, and intelligent appliances. This book gives readers valuable knowledge and programming techniques that are not currently part of traditional programming training.
標(biāo)簽: Optimization Performance Footprint and
上傳時(shí)間: 2014-01-06
上傳用戶:杜瑩12345
socket編程原理:UNIX系統(tǒng)的I/O命令集,是從Maltics和早期系統(tǒng)中的命令演變出來的,其模式為打開一讀/寫一關(guān)閉(open-write-read- close)。在一個(gè)用戶進(jìn)程進(jìn)行I/O操作時(shí),它首先調(diào)用“打開”獲得對(duì)指定文件或設(shè)備的使用權(quán),并返回稱為文件描述符的整型數(shù)
上傳時(shí)間: 2016-08-12
上傳用戶:懶龍1988
delphi 寫的delphi的程序 Handel is a free, standalone development tool created with Delphi 3 that enables you to create, compile, and run projects. Handel also supports Form Design Environments such as Delphi and can open and write units, projects, and forms created with Delphi 2 or 3. However, it is not perfectly compatible with Delphi.
標(biāo)簽: delphi development standalone created
上傳時(shí)間: 2014-01-18
上傳用戶:jing911003
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