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Digital-to-analog converters (DACs) are prevalent inindustrial control and automated test applications.General-purpose automated test equipment often requiresmany channels of precisely controlled voltagesthat span several voltage ranges. The LTC2704 is ahighly integrated 16-bit, 4-channel DAC for high-endapplications. It has a wide range of features designed toincrease performance and simplify design.
標(biāo)簽：
DAC
集成
四通道
工業(yè)
上傳時(shí)間：
2013-11-22
上傳用戶：元宵漢堡包
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PCI ExpressTM is the third generation of PCI (PeripheralComponent Interconnect) technology used to connect I/Operhipheral devices in computer systems. It is intended asa general purpose I/O device interconnect that meets theneeds of a wide variety of computing platforms such asdesktop, mobile, server and communications. It alsospecifies the electrical and mechanical attributes of thebackplane, connectors and removable cards in thesesystems.
標(biāo)簽：
Express
PCI
電源解決方案
上傳時(shí)間：
2013-11-17
上傳用戶：squershop
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HIGH SPEED 8051 μC CORE
- Pipe-lined Instruction Architecture; Executes 70% of Instructions in 1 or 2
System Clocks
- Up to 25MIPS Throughput with 25MHz System Clock
- 22 Vectored Interrupt Sources
MEMORY
- 4352 Bytes Internal Data RAM (256 + 4k)
- 64k Bytes In-System Programmable FLASH Program Memory
- External Parallel Data Memory Interface – up to 5Mbytes/sec
DIGITAL PERIPHERALS
- 64 Port I/O; All are 5V tolerant
- Hardware SMBusTM (I2CTM Compatible), SPITM, and Two UART Serial
Ports Available Concurrently
- Programmable 16-bit Counter/Timer Array with 5 Capture/Compare
Modules
- 5 General Purpose 16-bit Counter/Timers
- Dedicated Watch-Dog Timer; Bi-directional Reset
CLOCK SOURCES
- Internal Programmable Oscillator: 2-to-16MHz
- External Oscillator: Crystal, RC, C, or Clock
- Real-Time Clock Mode using Timer 3 or PCA
SUPPLY VOLTAGE ........................ 2.7V to 3.6V
- Typical Operating Current: 10mA @ 25MHz
- Multiple Power Saving Sleep and Shutdown Modes
100-Pin TQFP (64-Pin Version Available)
Temperature Range: –40°C to +85°C
標(biāo)簽：
C8051F020
上傳時(shí)間：
2013-10-12
上傳用戶：lalalal
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The PCF8578 is a low power CMOS1 LCD row and column driver, designed to drive dotmatrix graphic displays at multiplex rates of 1:8, 1:16, 1:24 or 1:32. The device has40 outputs, of which 24 are programmable and configurable for the following ratios ofrows/columns: 32¤8, 24¤16, 16¤24 or 8¤32. The PCF8578 can function as a stand-alone LCDcontroller and driver for use in small systems. For larger systems it can be used inconjunction with up to 32 PCF8579s for which it has been optimized. Together these twodevices form a general purpose LCD dot matrix driver chip set, capable of driving displaysof up to 40960 dots. The PCF8578 is compatible with most microcontrollers andcommunicates via a two-line bidirectional bus (I2C-bus). Communication overhead isminimized by a display RAM with auto-incremented addressing and display bankswitching.
標(biāo)簽：
8578
PCF
LCD
圖形點(diǎn)陣
上傳時(shí)間：
2013-10-23
上傳用戶：頂?shù)弥?/p>
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第一章 序論……………………………………………………………6
1- 1 研究動(dòng)機(jī)…………………………………………………………..7
1- 2 專題目標(biāo)…………………………………………………………..8
1- 3 工作流程…………………………………………………………..9
1- 4 開發(fā)環(huán)境與設(shè)備…………………………………………………10
第二章 德州儀器OMAP 開發(fā)套件…………………………………10
2- 1 OMAP介紹………………………………………………………10
2-1.1 OMAP是什麼?…….………………………………….…10
2-1.2 DSP的優(yōu)點(diǎn)……………………………………………....11
2- 2 OMAP Architecture介紹………………………………………...12
2-2-1 OMAP1510 硬體架構(gòu)………………………………….…12
2-2.2 OMAP1510軟體架構(gòu)……………………………………...12
2-2.3 DSP / BIOS Bridge簡(jiǎn)述…………………………………...13
2- 3 TI Innovator套件 -- OMAP1510 ……………………………..14
2-2.1 General Purpose processor -- ARM925T………………...14
2-2.2 DSP processor -- TMS320C55x …………………………15
2-2.3 IDE Tool – CCS …………………………………………15
2-2.4 Peripheral ………………………………………………..16
第三章 在OMAP1510上建構(gòu)Embedded Linux System…………….17
3- 1 嵌入式工具………………………………………………………17
3-1.1 嵌入式程式開發(fā)與一般程式開發(fā)之不同………….….17
3-1.2 Cross Compiling的GNU工具程式……………………18
3-1.3 建立ARM-Linux Cross-Compiling 工具程式………...19
3-1.4 Serial Communication Program………………………...20
3- 2 Porting kernel………………………………………………….…21
3-2.1 Setup CCS ………………………………………….…..21
3-2.2 編譯及上傳Loader…………………………………..…23
3-2.3 編譯及上傳Kernel…………………………………..…24
3- 3 建構(gòu)Root File System………………………………………..…..26
3-3.1 Flash ROM……………………………………………...26
3-3.2 NFS mounting…………………………………………..27
3-3.3 支援NFS Mounting 的kernel…………………………..27
3-3.4 提供NFS Mounting Service……………………………29
3-3.5 DHCP Server……………………………………………31
3-3.6 Linux root 檔案系統(tǒng)……………………………….…..32
3- 4 啟動(dòng)及測(cè)試Innovator音效裝置…………………………..…….33
3- 5 建構(gòu)支援DSP processor的環(huán)境…………………………...……34
3-5.1 Solution -- DSP Gateway簡(jiǎn)介……………………..…34
3-5.2 DSP Gateway運(yùn)作架構(gòu)…………………………..…..35
3- 6 架設(shè)DSP Gateway………………………………………….…36
3-6.1 重編kernel……………………………………………...36
3-6.2 DEVFS driver…………………………………….……..36
3-6.3 編譯DSP tool和API……………………………..…….37
3-6.4 測(cè)試……………………………………………….…….37
第四章 MP3 Player……………………………………………….…..38
4- 1 MP3 介紹………………………………………………….…….38
4- 2 MP3 壓縮原理……………………………………………….….39
4- 3 Linux MP3 player – splay………………………………….…….41
4.3-1 splay介紹…………………………………………….…..41
4.3-2 splay 編譯………………………………………….…….41
4.3-3 splay 的使用說明………………………………….……41
第五章 程式改寫………………………………………………...…...42
5-1 程式評(píng)估與改寫………………………………………………...…42
5-1.1 Inter-Processor Communication Scheme…………….....42
5-1.2 ARM part programming……………………………..…42
5-1.3 DSP part programming………………………………....42
5-2 程式碼………………………………………………………..……43
5-3 雙處理器程式開發(fā)注意事項(xiàng)…………………………………...…47
第六章 效能評(píng)估與討論……………………………………………48
6-1 速度……………………………………………………………...48
6-2 CPU負(fù)載………………………………………………………..49
6-3 討論……………………………………………………………...49
6-3.1分工處理的經(jīng)濟(jì)效益………………………………...49
6-3.2音質(zhì)v.s 浮點(diǎn)與定點(diǎn)運(yùn)算………………………..…..49
6-3.3 DSP Gateway架構(gòu)的限制………………………….…50
6-3.4減少IO溝通……………….………………………….50
6-3.5網(wǎng)路掛載File System的Delay…………………..……51
第七章 結(jié)論心得…
標(biāo)簽：
OMAP
1510
mp3
播放器
上傳時(shí)間：
2013-10-14
上傳用戶：a471778
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The PCA9674/74A provide general purpose remote I/O expansion for most
microcontroller families via the two-line bidirectional bus (I2C-bus) and is a part of the
Fast-mode Plus (Fm+) family.
標(biāo)簽：
9674
PCA
9674A
I2C
上傳時(shí)間：
2013-10-28
上傳用戶：linyao
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The PCA9536 is an 8-pin CMOS device that provides 4 bits of General Purpose parallel
Input/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed to
enhance the NXP Semiconductors family of I2C-bus I/O expanders. I/O expanders provide
a simple solution when additional I/O is needed for ACPI power switches, sensors,
push buttons, LEDs, fans, etc.
標(biāo)簽：
SMBus
9536
PCA
I2C
上傳時(shí)間：
2013-10-27
上傳用戶：w230825hy
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The PCA9534 is a 16-pin CMOS device that provide 8 bits of General Purpose parallel
Input/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed to
enhance the NXP Semiconductors family of I2C-bus I/O expanders. The improvements
include higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O
configuration, 400 kHz clock frequency, and smaller packaging. I/O expanders provide a
simple solution when additional I/O is needed for ACPI power switches, sensors,
push buttons, LEDs, fans, etc.
標(biāo)簽：
SMBus
9534
PCA
I2C
上傳時(shí)間：
2013-11-17
上傳用戶：vodssv
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The PCA9534 is a 16-pin CMOS device that provide 8 bits of General Purpose parallel
Input/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed to
enhance the NXP Semiconductors family of I2C-bus I/O expanders. The improvements
include higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O
configuration, 400 kHz clock frequency, and smaller packaging. I/O expanders provide a
simple solution when additional I/O is needed for ACPI power switches, sensors,
push buttons, LEDs, fans, etc.
標(biāo)簽：
interru
SMBus
power
9534
上傳時(shí)間：
2013-10-10
上傳用戶：inwins
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The PCA9535 and PCA9535C are 24-pin CMOS devices that provide 16 bits of GeneralPurpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications and wasdeveloped to enhance the NXP Semiconductors family of I2C-bus I/O expanders. Theimprovements include higher drive capability, 5 V I/O tolerance, lower supply current,individual I/O configuration, and smaller packaging. I/O expanders provide a simplesolution when additional I/O is needed for ACPI power switches, sensors, push buttons,LEDs, fans, etc.
標(biāo)簽：
9535
PCA
9535C
I2C
上傳時(shí)間：
2013-10-21
上傳用戶：愛死愛死
