基于FPGA設(shè)計(jì)的sdram讀寫測(cè)試實(shí)驗(yàn)Verilog邏輯源碼Quartus工程文件+文檔說(shuō)明，DRAM選用海力士公司的 HY57V2562 型號(hào),容量為的 256Mbit,采用了 54 引腳的TSOP 封裝, 數(shù)據(jù)寬度都為 16 位, 工作電壓為 3.3V,并丏采用同步接口方式所有的信號(hào)都是時(shí)鐘信號(hào)。FPGA型號(hào)Cyclone4E系列中的EP4CE6F17C8，Quartus版本17.1。timescale 1ps/1psmodule top(input clk,input rst_n,output[1:0] led,output sdram_clk, //sdram clockoutput sdram_cke, //sdram clock enableoutput sdram_cs_n, //sdram chip selectoutput sdram_we_n, //sdram write enableoutput sdram_cas_n, //sdram column address strobeoutput sdram_ras_n, //sdram row address strobeoutput[1:0] sdram_dqm, //sdram data enable output[1:0] sdram_ba, //sdram bank addressoutput[12:0] sdram_addr, //sdram addressinout[15:0] sdram_dq //sdram data);parameter MEM_DATA_BITS = 16 ; //external memory user interface data widthparameter ADDR_BITS = 24 ; //external memory user interface address widthparameter BUSRT_BITS = 10 ; //external memory user interface burst widthparameter BURST_size = 128 ; //burst sizewire wr_burst_data_req; // from external memory controller,write data request ,before data 1 clockwire wr_burst_finish; // from external memory controller,burst write finish
標(biāo)簽： fpga sdram verilog quartus
上傳時(shí)間： 2021-12-18
上傳用戶：
PW2330 develops a high efficiency synchronous step down DC-DC converter capable of delivering3A output current. PW2330 operates over a wide input voltage range from 4.5V to 30V andintegrates main switch and synchronous switch with very low RDS(ON) to minimize the conductionloss. PW2330 adopts the proprietary instant PWM architecture to achieve fast transient responsesfor high step down applications and high efficiency at light loads. In addition, it operates atpseudo-constant frequency of 500kHz under continuous conduction mode to minimize the size ofinductor and capacitor
標(biāo)簽： pw2330
上傳時(shí)間： 2022-02-11
上傳用戶：
PW2205 develops a high efficiency synchronous step-down DC-DC converter capable of delivering5A output current. PW2205 operates over a wide input voltage range from 4.5V to 30V andintegrates main switch and synchronous switch with very low RDS(ON) to minimize the conductionloss.PW2205 adopts the instant PWM architecture to achieve fast transient responses for high step downapplications and high efficiency at light loads. In addition, it operates at pseudo-constant frequencyof 500kHz under continuous conduction mode to minimize the size of inductor and capacitor
標(biāo)簽： pw2205
上傳時(shí)間： 2022-02-11
上傳用戶：
Single chip TFT-LCD Controller/Driver with On-chip Frame Memory (FM) Display Resolution: 240*RGB (H) *320(V) Frame Memory size: 240 x 320 x 18-bit = 1,382,400 bits LCD Driver Output Circuits- Source Outputs: 240 RGB Channels- Gate Outputs: 320 Channels- Common Electrode Output Display Colors (Color Mode)- Full Color: 262K, RGB=(666) max., Idle Mode Off- Color Reduce: 8-color, RGB=(111), Idle Mode On Programmable Pixel Color Format (Color Depth) for Various Display Data input Format- 12-bit/pixel: RGB=(444)- 16-bit/pixel: RGB=(565)- 18-bit/pixel: RGB=(666) MCU Interface- Parallel 8080-series MCU Interface (8-bit, 9-bit, 16-bit & 18-bit)- 6/16/18 RGB Interface(VSYNC, HSYNC, DOTCLK, ENABLE, DB[17:0])- Serial Peripheral Interface(SPI Interface)- VSYNC Interface
上傳時(shí)間： 2022-03-04
上傳用戶：
以AT89S52單片機(jī)為控制核心,采用電容降壓技術(shù),Buck電路拓?fù)?PWM驅(qū)動(dòng)模塊和功率器件散熱設(shè)計(jì),通過(guò)高速的數(shù)據(jù)采集、主功率輸入輸出模塊和控制模塊,設(shè)計(jì)一種新型智能車載充電器.在充電過(guò)程中,通過(guò)負(fù)脈沖瞬間放電實(shí)現(xiàn)對(duì)鉛酸蓄電池的再生修復(fù),提高電池的有效容量,延長(zhǎng)使用壽命.該充電器體積小、速度快、效率高、可靠性好.With AT89S52 single chip computer as the control core,a new type of intelligent car-carried charger was designed by using capacitance step-down technology,Buck circuit topology,PWM driving module and power device heat dissipation design,through high-speed data acquisition,main power input and output module and control module.In the charging process,the regeneration and repair of lead-acid batteries are realized by instantaneous discharge of negative pulse,which improves the effective capacity of batteries and prolongs their service life.The charger has the advantages of small size,fast speed,high efficiency and good reliability.
標(biāo)簽： 車載充電器
上傳時(shí)間： 2022-03-27
上傳用戶：
隨著科技的發(fā)展，人們?cè)谌粘Ｉ钪惺褂玫碾娖髟絹?lái)越多，電子設(shè)備的電磁兼容性（EMC）也越來(lái)越重要。所以，人們對(duì)電子設(shè)備的電磁兼容性的要求也越來(lái)越嚴(yán)格，越來(lái)越規(guī)范。而在市場(chǎng)競(jìng)爭(zhēng)中，如何降低成本、減少設(shè)備體積，是各電子設(shè)備制造廠家重點(diǎn)研究的課題。通過(guò)對(duì)開關(guān)電源的EMI濾波電路的類別和相應(yīng)的技術(shù)特點(diǎn)進(jìn)行分析，設(shè)計(jì)出一種既能提高性能，又能降低成本的濾波電路。With the development of technology, appliances people use in their daily lives, more and more electronic devices electromagnetic compatibility （ EMC ） has become increasingly important. So, people electromagnetic compatibility requirements of electronic devices have become increasingly stringent, more and more standardized. The competition in the market, how to reduce costs, reduce equipment size, is the subject of the electronic equipment manufacturer focused on research. Through the technical characteristics of the respective category and the EMI filter circuit switching power supply is analyzed both designed to improve a performance of the filter circuit can reduce the cost.
標(biāo)簽： 開關(guān)電源 濾波電路
上傳時(shí)間： 2022-04-23
上傳用戶：
Allegro導(dǎo)出 Gerber文件和鉆孔數(shù)據(jù)文件很多PCB廠家都沒(méi)有裝Allegro軟件，所以你不能直接發(fā).brd文件。（很多PCB小廠連ProtelDXP也沒(méi)有，只支持Protel99）什么是Gerber文件Gerber文件是所有電路設(shè)計(jì)軟件都可以產(chǎn)生的文件，在電子組裝行業(yè)又稱為模版文件（stencil data），在PCB制造業(yè)又稱為光繪文件。可以說(shuō)Gerber文件是電子組裝業(yè)中最通用最廣泛的文件格式Gerber文件是EIA的標(biāo)準(zhǔn)格式，分RS274-D和RS274-X兩種，其中RS274-X是RS274-D的擴(kuò)展文件。生產(chǎn)制造部門在條件許可的情況下，應(yīng)當(dāng)盡可能要求用戶或設(shè)計(jì)部門提供RS274-X的Gerber文件，這樣有利于各工序的生產(chǎn)準(zhǔn)備。準(zhǔn)備工作為了保證出片的正確性，需要在設(shè)計(jì)PCB文件之前對(duì)一些系統(tǒng)參數(shù)進(jìn)行設(shè)置，該設(shè)置包括畫圖的精度，圖片的尺寸，動(dòng)態(tài)鋪銅的格式。設(shè)置畫圖的精度。在allegro中打開Setup->Drawing size菜單，調(diào)出設(shè)置對(duì)話框，如圖1在對(duì)話框中確定User Units選擇Mils，size選擇C，這樣整個(gè)作圖區(qū)域會(huì)大一點(diǎn)，相應(yīng)的作圖范圍（Drawing Extents）變?yōu)閃idth：22000.00：Height：17000.00Left X和LeftY為原點(diǎn)坐標(biāo)。Accuracy選擇2，其他根據(jù)你的尺寸自行定義。設(shè)置完成選擇OK按鈕，使配置生效。
上傳時(shí)間： 2022-04-30
上傳用戶：zhaiyawei
This manual documents the Microcontroller profile of version 7 of the ARM? Architecture, the ARMv7-M architecture profile. For short definitions of all the ARMv7 profiles see About the ARMv7 architecture, and architecture profiles on page A1-20.ARMv7 is documented as a set of architecture profiles. The profiles are defined as follows: ARMv7-A The application profile for systems supporting the ARM and Thumb instruction sets, and requiring virtual address support in the memory management model. ARMv7-R The realtime profile for systems supporting the ARM and Thumb instruction sets, and requiring physical address only support in the memory management model ARMv7-M The microcontroller profile for systems supporting only the Thumb instruction set, and where overall size and deterministic operation for an implementation are more important than absolute performance. While profiles were formally introduced with the ARMv7 development, the A-profile and R-profile have implicitly existed in earlier versions, associated with the Virtual Memory System Architecture (VMSA) and Protected Memory System Architecture (PMSA) respectively.
標(biāo)簽： arm
上傳時(shí)間： 2022-06-02
上傳用戶：
INTRODUCTION In the past, adding speech recording and playback capability to a product meant using a digital signal processor or a specialized audio chip. Now, using a simplified Adaptive Differential Pulse Code Modulation(ADPCM) algorithm, these audio capabilities can be added to any PICmicro device. This application note will cover the ADPCM compression and decompression algorithms, performance comparison of all PICmicro devices, and an application using a PIC16C72 micro-controller.DEFINITION OF TERMS step size -value of the step used for quantization of ana-log signals and inverse quantization of a number of steps.quantization -the digital form of an analog input signal is represented by a finite number of steps.adaptive quantization -the step size of a quantizer is dramatically changed with time in order to adapt to a changing input signal.inverse quantizer -a finite number of steps is converted into a digital representation of an analog signal.
上傳時(shí)間： 2022-06-20
上傳用戶：
一建立STM32cubeMX工程1.建立新工程，選擇芯片STM32F302CCTx2. 在Pinout 中時(shí)鐘配置為高速外部時(shí)鐘， UART配置為異步通信， cube 會(huì)自動(dòng)分配引腳。3.Clock Configuration 中配置如下4.configuration 中點(diǎn)擊USART1可進(jìn)入配置在USART1 configuration 中Parameter Settings 可以配置波特率，發(fā)送數(shù)據(jù)字長(zhǎng)，奇偶校驗(yàn)位和停止位等。NVIC Setting 可以配置中斷優(yōu)先級(jí)。5.生成keil 軟件代碼點(diǎn)擊工具欄中的齒輪按鈕，可以選擇代碼的開發(fā)平臺(tái)， ok 結(jié)束。（文件保存路徑一定要是全英文的）進(jìn)過(guò)了我們一系列的配置， cube 會(huì)為我們自動(dòng)生成keil 軟件的代碼，代碼中包括工程所需的固件庫(kù)，配套的頭文件，啟動(dòng)文件及用戶文件。在main.c 中包括了我們工程所需外設(shè)的初始化，包括了系統(tǒng)時(shí)鐘初始化，中斷初始化， GPIO初始化， USART1初始化， HAL庫(kù)初始化。我們只需要在main.c 中添加我們自己的代碼就可以了。二keil 軟件代碼及HAL庫(kù)使用UART_HandleTypeDef huart1；生成的代碼中有聲明一個(gè)USART處理的結(jié)構(gòu)體HAL庫(kù)中串口的數(shù)據(jù)收發(fā)有四個(gè)函數(shù)HAL_StatusTypeDef HAL_UART_Transmit(UART_HandleTypeDef *huart, uint8_t *pData, uint16_tsize, uint32_t Timeout);HAL_StatusTypeDef HAL_UART_Receive(UART_HandleTypeDef *huart, uint8_t *pData, uint16_tsize, uint32_t Timeout);指針huart 指向我們之前定義的USART處理結(jié)構(gòu)體， 我們將在函數(shù)中對(duì)結(jié)構(gòu)體中的參數(shù)進(jìn)行操作。pDate 是我們自己定義的數(shù)據(jù)發(fā)送接收緩存， size 發(fā)送接收數(shù)據(jù)個(gè)數(shù)， Timeout 超時(shí)持續(xù)時(shí)間。UART狀態(tài)的結(jié)構(gòu)體：我們?cè)诎l(fā)送接收函數(shù)中要經(jīng)常對(duì)USART的狀態(tài)進(jìn)行判斷，以便我們對(duì)函數(shù)結(jié)構(gòu)體中的參數(shù)進(jìn)行操作
標(biāo)簽： stm32cubemx 串口
上傳時(shí)間： 2022-06-22
上傳用戶：shjgzh
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