EPCS-9000 提供了一路CAN-bus現場總線接口和一個攝像頭接口。可以在工業溫度范圍(-40℃~85℃)內穩定工作,可以滿足各種條件苛刻的工業應用,如:工業控制、現場通信、遠程監控等領域;也可以滿足一般的多媒體應用,如:視頻監控、視頻廣告等領域。
上傳時間: 2013-10-11
上傳用戶:kao21
8051單片機系統擴展與接口技術:第一節 8051 單片機系統擴展概述第二節 單片機外部存儲器擴展第三節 單片機輸入輸出(I/O)口擴展及應用第四節 LED顯示器接口電路及顯示程序第五節 單片機鍵盤接口技術第六節 單片機與數模(D/A)及模數(A/D)轉換1、地址總線(Address Bus,簡寫為AB)地址總線可傳送單片機送出的地址信號,用于訪問外部存儲器單元或I/O端口。A 地址總線是單向的,地址信號只是由單片機向外發出。B 地址總線的數目決定了可直接訪問的存儲器單元的數目。例如N位地址,可以產生2N個連續地址編碼,因此可訪問2N個存儲單元,即通常所說的尋址范圍為 2N個地址單元。MCS—51單片機有十六位地址線,因此存儲器展范圍可達216 = 64KB地址單元。C 掛在總線上的器件,只有地址被選中的單元才能與CPU交換數據,其余的都暫時不能操作,否則會引起數據沖突。2、數據總線(Data Bus,簡寫為DB)數據總線用于在單片機與存儲器之間或單片機與I/O端口之間傳送數據。A 單片機系統數據總線的位數與單片機處理數據的字長一致。例如MCS—51單片機是8位字長,所以數據總線的位數也是8位。B 數據總線是雙向的,即可以進行兩個方向的數據傳送。3、控制總線(Control Bus,簡寫為CB)控制總線實際上就是一組控制信號線,包括單片機發出的,以及從其它部件送給單片機的各種控制或聯絡信號。對于一條控制信號線來說,其傳送方向是單向的,但是由不同方向的控制信號線組合的控制總線則表示為雙向的。總線結構形式大大減少了單片機系統中連接線的數目,提高了系統的可靠性,增加了系統的靈活性。此外,總線結構也使擴展易于實現,各功能部件只要符合總線規范,就可以很方便地接入系統,實現單片機擴展。
上傳時間: 2013-10-18
上傳用戶:assef
本文依據集成電路設計方法學,探討了一種基于標準Intel 8086 微處理器的單芯片計算機平臺的架構。研究了其與SDRAM,8255 并行接口等外圍IP 的集成,并在對AMBA協議和8086 CPU分析的基礎上,采用遵從AMBA傳輸協議的系統總線代替傳統的8086 CPU三總線結構,搭建了基于8086 IP 軟核的單芯片計算機系統,并實現了FPGA 功能演示。關鍵詞:微處理器; SoC;單芯片計算機;AMBA 協議 Design of 8086 CPU Based Computer-on-a-chip System(School of Electrical Engineering and Automation, Heifei University of Technology, Hefei, 230009,China)Abstract: According to the IC design methodology, this paper discusses the design of one kind of Computer-on-a-chip system architecture, which is based on the standard Intel8086 microprocessor,investigates how to integrate the 8086 CPU and peripheral IP such as, SDRAM controller, 8255 PPI etc. Based on the analysis of the standard Intel8086 microprocessor and AMBA Specification,the Computer-on-a-chip system based on 8086 CPU which uses AMBA bus instead of traditional three-bus structure of 8086 CPU is constructed, and the FPGA hardware emulation is fulfilled.Key words: Microprocessor; SoC; Computer-on-a-chip; AMBA Specification
上傳時間: 2013-12-27
上傳用戶:kernor
采用UART做LIN總線的從節點應用:本應用例使用SPMC75F2313A和通用LIN Bus收發器TJA1020(或ATA6661)實現LIN(Local Interconnect Network)是低成本的汽車網絡的傳輸。1.2 LIN Bus規范LIN 是低成本網絡中的汽車通訊協議標準,LIN(Local Interconnect Network)是低成本的汽車網絡,它是現有多種汽車網絡在功能上的補充由于能夠提高質量、降低成本,LIN 將是在汽車中使用汽車分級網絡的啟動因素。LIN 的標準化將簡化多種現存的多點解決方案且將降低在汽車電子領域中的開發生產服務和后勤成本。LIN 標準包括傳輸協議規范、傳輸媒體規范、開發工具接口規范和用于軟件編程的接口LIN在硬件和軟件上保證了網絡節點的互操作性并有可預測EMC的功能。
上傳時間: 2013-11-19
上傳用戶:
采用UART做LIN總線的主節點應用:本應用例使用SPMC75F2313A和通用LIN Bus收發器TJA1020(或ATA6661)實現LIN(Local Interconnect Network)是低成本的汽車網絡的傳輸。1.2 LIN Bus規范LIN 是低成本網絡中的汽車通訊協議標準,LIN(Local Interconnect Network)是低成本的汽車網絡,它是現有多種汽車網絡在功能上的補充由于能夠提高質量、降低成本,LIN 將是在汽車中使用汽車分級網絡的啟動因素。LIN 的標準化將簡化多種現存的多點解決方案且將降低在汽車電子領域中的開發生產服務和后勤成本。LIN 標準包括傳輸協議規范、傳輸媒體規范、開發工具接口規范和用于軟件編程的接口LIN在硬件和軟件上保證了網絡節點的互操作性并有可預測EMC的功能。
上傳時間: 2013-10-15
上傳用戶:AISINI005
多功能高集成外圍器件6. 1 多功能高集成外圍器件82371PCI的英文名稱:Peripheral Component Interconnect (外圍部件互聯PCI總線);82371是PCI總線組件。ISA是:Industry Standard Architecture(工業標準體系結構)IDE是 (Integrated Device Electronics)集成電路設備簡稱PIIX4PIIX4器件(芯片)的特點1、是一種支持Pentium和PentiumII微處理器的部件。2、82371對ISA橋來說,是一種多功能PCI總線。3、對可移動性和桌面深綠色環境均提供支持。4、電源管理邏輯。5、被集成化的IDE控制器。6、增強了性能的DMA控制器。(7)基于兩個82C59的中斷控制器。(8)基于82C54芯片的定時器。(9)USB(Universal Serial Bus)通用串行總線。(10)SMBus系統管理總線。(11)實時時鐘(12)順應Microsoft Win95所需的功能其芯片的邏輯框圖如圖6-1所示。 PIIX4芯片邏輯框圖6.1.1 概述PIIX4芯片是一個多功能的PCI器件,圖6-2 是82371在系統中扮演的角色。(續上圖)1. PCI與EIO之間的橋(PIIX4芯片)橋是不對程的,是各類不同標準總線與PCI總線連接,82371AB橋也可理解為一種總線轉換譯碼器和控制器,橋內包含復雜的協議總線信號和緩沖器。(1).在PCI系統內,當PIIX4操作時,它總是作為系統內各種模塊的主控設備,如USB和DMA控制器、IDE總線和分布式DMA的主控設備等,而且總是以ISA主控設備的名義出現。(2). 在向ISA總線或IDE總線進行傳送操作的傳送周期期間作為從屬設備使用,并對內部寄存器譯碼。PIIX4芯片(橋)的配置(1).可以把PIIX4芯片配置成整個ISA總線,或ISA總線的子集,也可擴展成EIO總線。在使用EIO總線時,可以把未使用的信號配置成通用的輸入和輸出。(2).PIIX4可直接驅動5個ISA插槽;(3).能提供字節-交換邏輯、I/O的恢復支持、等待狀態的生成以及SYSCLK的生成。(4).提供X-BUS鍵盤控制器芯片、BIOS芯片、實時時鐘芯片、二級微程序器等的選擇。2. IDE接口(總線主控設備的權利和同步DMA方式)IDE接口為4個IDE的設備提供支持,比如IDE接口的硬盤和CD-ROM等。注意:目前硬盤接口有5類:IDE、SCSI、Fibre Channel、IEEE1394和USB等。IDE口幾乎在PC機最多,因為便宜。SCSI多用于服務器和集群機。IDE的PIO IDE速率:14MB/s;而總線主控設備IDE的速率:33MB/s在PIIX4芯片的IDE系統內,配有兩個各次獨立的IDE信號通道。3. 具有兼容性的模塊—DMA、定時器/計數器、中斷控制器等(1)在PIIX4內的兩各82C37 DMA控制器經邏輯的組合,產生7個獨立的可編程通道。通道[0:3]是通過與8個二進位的硬件連線實現的。通過以字節為單位的計數進行傳送。而通道[5:7]是通過16個二進位的連線實現的,以字為單位的計數進行傳送。(2)DMA控制器還能通過PCI總線,處理舊的DMA的兩個不同的方法提供支持。(3)計數/定時器模塊在功能上與82C54等價。(4)中斷控制器與ISA兼容,其功能是兩個82C59的功能之和。
上傳時間: 2013-11-19
上傳用戶:3到15
In this document, the term Ô60xÕ is used to denote a 32-bit microprocessor from the PowerPC architecture family that conforms to the bus interface of the PowerPC 601ª, PowerPC 603ª, or PowerPC 604 microprocessors. Note that this does not include the PowerPC 602ª microprocessor which has a multiplexed address/data bus. 60x processors implement the PowerPC architecture as it is speciÞed for 32-bit addressing, which provides 32-bit effective (logical) addresses, integer data types of 8, 16, and 32 bits,and ßoating-point data types of 32 and 64 bits (single-precision and double-precision).1.1 Overview The MPC106 provides an integrated high-bandwidth, high-performance, TTL-compatible interface between a 60x processor, a secondary (L2) cache or additional (up to four total) 60x processors, the PCI bus,and main memory. This section provides a block diagram showing the major functional units of the 106 and describes brießy how those units interact.Figure 1 shows the major functional units within the 106. Note that this is a conceptual block diagram intended to show the basic features rather than an attempt to show how these features are physically implemented on the device.
上傳時間: 2013-10-08
上傳用戶:18711024007
The Motorola MPC106 PCI bridge/memory controller provides a PowerPCªmicroprocessor common hardware reference platform (CHRPª) compliant bridgebetween the PowerPC microprocessor family and the Peripheral Component Interconnect(PCI) bus. In this document, the term Ô106Õ is used as an abbreviation for the phraseÔMPC106 PCI bridge/memory controllerÕ. This document contains pertinent physicalcharacteristics of the 106. For functional characteristics refer to theMPC106 PCI Bridge/Memory Controller UserÕs Manual.This document contains the following topics:Topic PageSection 1.1, ÒOverviewÓ 2Section 1.2, ÒFeaturesÓ 3Section 1.3, ÒGeneral ParametersÓ 5Section 1.4, ÒElectrical and Thermal CharacteristicsÓ 5Section 1.5, ÒPin AssignmentsÓ 17Section 1.6, ÒPinout Listings 18Section 1.7, ÒPackage DescriptionÓ 22Section 1.8, ÒSystem Design InformationÓ 24Section 1.9, ÒDocument Revision HistoryÓ 29Section 1.10, ÒOrdering InformationÓ 29
上傳時間: 2013-11-04
上傳用戶:as275944189
The μPSD32xx family, from ST, consists of Flash programmable system devices with a 8032 MicrocontrollerCore. Of these, the μPSD3234A and μPSD3254A are notable for having a complete implementationof the USB hardware directly on the chip, complying with the Universal Serial Bus Specification, Revision1.1.This application note describes a demonstration program that has been written for the DK3200 hardwaredemonstration kit (incorporating a μPSD3234A device). It gives the user an idea of how simple it is to workwith the device, using the HID class as a ready-made device driver for the USB connection.IN-APPLICATION-PROGRAMMING (IAP) AND IN-SYSTEM-PROGRAMMING (ISP)Since the μPSD contains two independent Flash memory arrays, the Micro Controller Unit (MCU) can executecode from one memory while erasing and programming the other. Product firmware updates in thefield can be reliably performed over any communication channel (such as CAN, Ethernet, UART, J1850)using this unique architecture. For In-Application-Programming (IAP), all code is updated through theMCU. The main advantage for the user is that the firmware can be updated remotely. The target applicationruns and takes care on its own program code and data memory.IAP is not the only method to program the firmware in μPSD devices. They can also be programmed usingIn-System-Programming (ISP). A IEEE1149.1-compliant JTAG interface is included on the μPSD. Withthis, the entire device can be rapidly programmed while soldered to the circuit board (Main Flash memory,Secondary Boot Flash memory, the PLD, and all configuration areas). This requires no MCU participation.The MCU is completely bypassed. So, the μPSD can be programmed or reprogrammed any time, anywhere, even when completely uncommitted.Both methods take place with the device in its normal hardware environment, soldered to a printed circuitboard. The IAP method cannot be used without previous use of ISP, because IAP utilizes a small amountof resident code to receive the service commands, and to perform the desired operations.
標簽: Demonstration 3200 USB for
上傳時間: 2014-02-27
上傳用戶:zhangzhenyu
The μPSD32xx family, from ST, consists of Flash programmable system devices with a 8032 Microcontroller Core. Of these, the μPSD3234A and μPSD3254A are notable for having a complete implementation of the USB hardware directly on the chip, complying with the Universal Serial Bus Specification, Revision 1.1.This application note describes a demonstration program that has been written for the DK3200 hardware demonstration kit (incorporating a μPSD3234A device). It gives the user an idea of how simple it is to work with the device, using the HID class as a ready-made device driver for the USB connection.
上傳時間: 2014-04-03
上傳用戶:lizhizheng88