<nav id="g60oe"></nav> SRAM-based FPGAs are non-volatile devices. Upon powerup, They are required to be programmed from an external source. This procedure allows anyone to easily monitor the bit-stream, and clone the device. The problem then becomes how can you effectively protect your intellectual property from others in an architecture where the part is externally programmed?
標(biāo)簽： FPGA PLD 數(shù)據(jù)加密
上傳時(shí)間： 2013-11-06
上傳用戶：wl9454
The NCV7356 is a physical layer device for a single wire data linkcapable of operating with various Carrier Sense Multiple Accesswith Collision Resolution (CSMA/CR) protocols such as the BoschController Area Network (CAN) version 2.0. This serial data linknetwork is intended for use in applications where high data rate is notrequired and a lower data rate can achieve cost reductions in both thephysical media components and in the microprocessor and/ordedicated logic devices which use the network.The network shall be able to operate in either the normal data ratemode or a high-speed data download mode for assembly line andservice data transfer operations. The high-speed mode is onlyintended to be operational when the bus is attached to an off-boardservice node. This node shall provide temporary bus electrical loadswhich facilitate higher speed operation. Such temporary loads shouldbe removed when not performing download operations.The bit rate for normal communications is typically 33 kbit/s, forhigh-speed transmissions like described above a typical bit rate of83 kbit/s is recommended. The NCV7356 features undervoltagelockout, timeout for faulty blocked input signals, output blankingtime in case of bus ringing and a very low sleep mode current.
上傳時(shí)間： 2013-10-24
上傳用戶：s藍(lán)莓汁
Single-Ended and Differential S-Parameters Differential circuits have been important incommunication systems for many years. In the past,differential communication circuits operated at lowfrequencies, where they could be designed andanalyzed using lumped-element models andtechniques. With the frequency of operationincreasing beyond 1GHz, and above 1Gbps fordigital communications, this lumped-elementapproach is no longer valid, because the physicalsize of the circuit approaches the size of awavelength.Distributed models and analysis techniques are nowused instead of lumped-element techniques.Scattering parameters, or S-parameters, have beendeveloped for this purpose [1]. These S-parametersare defined for single-ended networks. S-parameterscan be used to describe differential networks, but astrict definition was not developed until Bockelmanand others addressed this issue [2]. Bockelman’swork also included a study on how to adapt single-ended S-parameters for use with differential circuits[2]. This adaptation, called “mixed-mode S-parameters,” addresses differential and common-mode operation, as well as the conversion betweenthe two modes of operation.This application note will explain the use of single-ended and mixed-mode S-parameters, and the basicconcepts of microwave measurement calibration.
上傳時(shí)間： 2014-03-25
上傳用戶：yyyyyyyyyy
Multioutput monolithic regulators are easy to use and fi tinto spaces where multichip solutions cannot. Nevertheless,the popularity of multioutput regulators is temperedby a lack of options for input voltages above 30V andsupport of high output currents. The LT3692A fi lls thisgap with a dual monolithic regulator that operates frominputs up to 36V. It also includes a number of channeloptimization features that allow the LT3692A’s per-channelperformance to rival that of multichip solutions.
標(biāo)簽： 492 DN 降壓 溫度監(jiān)控
上傳時(shí)間： 2014-01-03
上傳用戶：Huge_Brother
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[FK_藥品庫(kù)存_藥品資料]') and OBJECTPROPERTY(id, N'IsForeignKey') = 1) ALTER TABLE [dbo].[藥品庫(kù)存] DROP CONSTRAINT FK_藥品庫(kù)存_藥品資料 GO if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[FK_門(mén)診劃價(jià)明細(xì)_門(mén)診劃價(jià)]') and OBJECTPROPERTY(id, N'IsForeignKey') = 1) ALTER TABLE [dbo].[門(mén)診劃價(jià)明細(xì)] DROP CONSTRAINT FK_門(mén)診劃價(jià)明細(xì)_門(mén)診劃價(jià) GO if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[FK_門(mén)診掛號(hào)_門(mén)診掛號(hào)類型]') and OBJECTPROPERTY(id, N'IsForeignKey') = 1) ALTER TABLE [dbo].[門(mén)診掛號(hào)] DROP CONSTRAINT FK_門(mén)診掛號(hào)_門(mén)診掛號(hào)類型 GO if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[產(chǎn)地]') and OBJECTPROPERTY(id, N'IsUserTable') = 1) drop table [dbo].[產(chǎn)地] GO if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[醫(yī)生資料]') and OBJECTPROPERTY(id, N'IsUserTable') = 1) drop table [dbo].[醫(yī)生資料]
標(biāo)簽： 信息管理系統(tǒng) 源代碼
上傳時(shí)間： 2013-11-12
上傳用戶：sunshie
if exists (select * from dbo.sysobjects where id = object_id(N\'[dbo].[FK_帳單明細(xì)_入住單]\') and OBJECTPROPERTY(id, N\'IsForeignKey\') = 1) ALTER TABLE [dbo].[帳單明細(xì)] DROP CONSTRAINT FK_帳單明細(xì)_入住單 GO if exists (select * from dbo.sysobjects where id = object_id(N\'[dbo].[FK_入住單_客房信息]\') and OBJECTPROPERTY(id, N\'IsForeignKey\') = 1) ALTER TABLE [dbo].[入住單] DROP CONSTRAINT FK_入住單_客房信息 GO if exists (select * from dbo.sysobjects where id = object_id(N\'[dbo].[FK_客房信息_客房類型]\') and OBJECTPROPERTY(id, N\'IsForeignKey\') = 1) ALTER TABLE [dbo].[客房信息] DROP CONSTRAINT FK_客房信息_客房類型
標(biāo)簽： 管理系統(tǒng) 源代碼
上傳時(shí)間： 2014-03-23
上傳用戶：chenhr
c#數(shù)據(jù)庫(kù)開(kāi)發(fā)實(shí)例:有很多的實(shí)例，對(duì)學(xué)習(xí)非常的有意義！ 酒店管理系統(tǒng)源代碼 醫(yī)院信息管理系統(tǒng)源代碼 圖書(shū)館管理系統(tǒng)源代碼 財(cái)務(wù)管理系統(tǒng)源代碼 生產(chǎn)管理系統(tǒng)源代碼 人力資源管理實(shí)例程序源代碼 進(jìn)銷存管理實(shí)例程序源代碼 if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[采購(gòu)訂單_供貨商_fk]') and OBJECTPROPERTY(id, N'IsForeignKey') = 1) ALTER TABLE [dbo].[采購(gòu)訂單] DROP CONSTRAINT 采購(gòu)訂單_供貨商_fk GO if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[采購(gòu)訂單歷史_供貨商_fk]') and OBJECTPROPERTY(id, N'IsForeignKey') = 1) ALTER TABLE [dbo].[采購(gòu)訂單歷史] DROP CONSTRAINT 采購(gòu)訂單歷史_供貨商_fk
標(biāo)簽： 數(shù)據(jù)庫(kù) 開(kāi)發(fā)實(shí)例
上傳時(shí)間： 2013-10-30
上傳用戶：392210346
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[采購(gòu)訂單_供貨商_fk]') and OBJECTPROPERTY(id, N'IsForeignKey') = 1) ALTER TABLE [dbo].[采購(gòu)訂單] DROP CONSTRAINT 采購(gòu)訂單_供貨商_fk GO if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[采購(gòu)訂單歷史_供貨商_fk]') and OBJECTPROPERTY(id, N'IsForeignKey') = 1) ALTER TABLE [dbo].[采購(gòu)訂單歷史] DROP CONSTRAINT 采購(gòu)訂單歷史_供貨商_fk GO if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[采購(gòu)合同_供貨商_fk]') and OBJECTPROPERTY(id, N'IsForeignKey') = 1) ALTER TABLE [dbo].[采購(gòu)合同] DROP CONSTRAINT 采購(gòu)合同_供貨商_fk GO if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[進(jìn)貨單_供貨商_fk]') and OBJECTPROPERTY(id, N'IsForeignKey') = 1) ALTER TABLE [dbo].[進(jìn)貨單] DROP CONSTRAINT 進(jìn)貨單_供貨商_fk
標(biāo)簽： 進(jìn)銷 實(shí)例程序 源代碼
上傳時(shí)間： 2013-11-15
上傳用戶：wkxiian
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[FK_工資發(fā)放歷史表_職員基本信息表]') and OBJECTPROPERTY(id, N'IsForeignKey') = 1) ALTER TABLE [dbo].[工資發(fā)放歷史表] DROP CONSTRAINT FK_工資發(fā)放歷史表_職員基本信息表 GO if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[FK_月工資統(tǒng)計(jì)表_職員基本信息表]') and OBJECTPROPERTY(id, N'IsForeignKey') = 1) ALTER TABLE [dbo].[月工資統(tǒng)計(jì)表] DROP CONSTRAINT FK_月工資統(tǒng)計(jì)表_職員基本信息表 GO if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[FK_職員懲罰表_職員基本信息表]') and OBJECTPROPERTY(id, N'IsForeignKey') = 1) ALTER TABLE [dbo].[職員懲罰表] DROP CONSTRAINT FK_職員懲罰表_職員基本信息表
上傳時(shí)間： 2014-11-17
上傳用戶：xinzhch
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[mrp物料需求計(jì)算_物料編號(hào)_fk]') and OBJECTPROPERTY(id, N'IsForeignKey') = 1) ALTER TABLE [dbo].[mrp物料需求計(jì)算] DROP CONSTRAINT mrp物料需求計(jì)算_物料編號(hào)_fk GO if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[mrp物料需求計(jì)算結(jié)果_物料編號(hào)_fk]') and OBJECTPROPERTY(id, N'IsForeignKey') = 1) ALTER TABLE [dbo].[mrp物料需求計(jì)算結(jié)果] DROP CONSTRAINT mrp物料需求計(jì)算結(jié)果_物料編號(hào)_fk GO if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[mrp物料需求歷史_物料編號(hào)_fk]') and OBJECTPROPERTY(id, N'IsForeignKey') = 1) ALTER TABLE [dbo].[mrp物料需求歷史] DROP CONSTRAINT mrp物料需求歷史_物料編號(hào)_fk GO if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[物料清單_物料編號(hào)_fk]') and OBJECTPROPERTY(id, N'IsForeignKey') = 1) ALTER TABLE [dbo].[物料清單] DROP CONSTRAINT 物料清單_物料編號(hào)_fk
標(biāo)簽： 生產(chǎn)管理 源代碼
上傳時(shí)間： 2013-11-23
上傳用戶：wcl168881111111
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