DMA CONTROLLER AND DMA TRANSFER METHODPROBLEM TO BE SOLVED: To provide a DMA controller performing the real-time control of DMA transfer related to a periodically operating peripheral device at low cost with low power consumption.NAGAI YASUSHI永井 靖NAKAKOSHI HIROSHI中越 洋TAIRA SHIGEKI...
A DMA transferring system with a plurality of devices, the devices being connected to each other by a data transmission line, where DMA transferring is performed among the devices i
This DMA controller is provided with a bus release time register 200 for setting the ratio of the number of times of bus access based on DMA transfer and the number of times of bus access by the other bus master, a DMA request detecting part 60 for detecting a DMA request, a bus relea...
The present invention provides a method for DMA transfer YUV video data, comprising: configuring a source start address of the video data in YUV Y data, U data, and V data, information of the original storage format YUV video data, target information storage format and size information; and ...
对于大容量的STM32芯片有2个DMA控制器两个DMA控制器,DMA1有7个通道,DMA2有5个通道。每个通道都可以配置一些外设的地址。 ①DMA1 controller 从外设(TIMx[x=1、2、3、4]、ADC1、SPI1、SPI/I2S2、I2Cx[x=1、2]和USARTx[x=1、2、3])产生的7个DMA请求,通过逻辑或输入到DMA1控制器 其中每个通道都对应...
DMA Controller:DMA 控制器,其通常位于 PCIe Endpoint 内,用于设备对 DRAM 中数据进行”DMA 读”或“DMA 写”。 Device Memory:设备内存,用于对设备进行控制,如配置设备、获取设备状态等;在系统对PCIe 总线进行深度优先扫描时,会根据设备的 Bar 空间大小(Device Memory Size,如下面的网卡例如,Bar 0,2,4 Size ...
前言本文分析哪吒版中的 DMA Controller 和 SPI 驱动和以太网驱动使用 DMAC 的方式 先把结论放前头吧 Linux DMAC模块硬件内置 DMAC申请 DMA channel需要申请无需申请配置 channel 并获取描述符需要申请无需申请DMA…
因此,为了满足这些多样的需求,DMA controller提供一个额外的参数---transfer width。 2.6burst size 当传输的源或者目的地是memory的时候,为了提高效率,DMA controller不愿意每一次传输都访问memory,而是在内部开一个buffer,将数据缓存在自己buffer中: memory是源的时候,一次从memory读出一批数据,保存在自己的buffer...
PURPOSE:To perform DMA transfer uniformly to respective channels without providing any special hardware outside nor allowing a specific channel occupy the DMA transfer. CONSTITUTION:This DMA transfer controller is provided with an access arbitration circuit 2 which generates DMA execution permission signals...
DMA CONTROLLER AND METHOD FOR CONTROLLING DATA TRANSFER PROBLEM TO BE SOLVED: To provide a DMA controller capable of effectively preventing leakage of confidential information and of transferring data according to a request from another device to transfer the data, even in the case of confide... ...