dmaengine: 是DMA子系统的核心,为DMA Device Driver提供DMA设备注册的API,为DMA调用者(Device Driver)提供屏蔽DMA设备实现细节的统一接口API; virt-dma: 为DMA子系统提供虚拟DMA channel的支持; of-dma: 为DMA子系统提供设备树描述DMA信息传入的支持; DMA Device Driver: 为DMA设备的驱动程序; dmatest: 提供dmates...
DMA DEVICEPROBLEM TO BE SOLVED: To provide a DMA(direct memory access) device which reduces the load of data transfer by DMA on a processor and performs efficient data transfer.ONISHI TOSHIKI大西 俊樹MIZUGUCHI NOBUAKI水口 信明
PURPOSE:To execute a DMA to a CPU with no bus releasing mode by receiving a DMA requesting signal from an external system at the interruption terminal of the CPU and making a unidirectional try state buffer and a bidirectional try state buffer into high impedances with an interrupting mode. ...
These operations are commonly referred to as Direct Memory Access (DMA) operations. You can exploit DMA support to accelerate certain combinations of operations. For example, on such a device, you could perform a blit from system memory to video memory while using the processor to prepare the ...
When the data bus is cut off from the CPU () and the transmission ready signal (TXRDY) is activated, the DMA control circuit () reads bits of data at once according to the lead address of the destined area for storage in the DRAM () and the address width that are set by the CPU...
Types of Device DMA Devices perform one of the following three types of DMA: Bus-master DMA Third-party DMA First-party DMA Bus-Master DMA The driver should program the device's DMA registers directly in cases where the device acts like a true bus master. For example, a device acts like...
/* Obtain a handle for the device */ if ((rx = alt_dma_rxchan_open ("/dev/dma_0")) == NULL) fails to open the rx channel ... investigating , the system.h generated is missing the anything that has *DMA* in it. the top.socpinfo does c...
•dma_sync_single_for_device是Linux内核中用于同步设备与内存之间单个数据缓冲区的函数。 2. •dma_sync_single_for_device函数用于确保设备与内存中的数据一致性,即设备能够正确读取或写入内存中的数据。 •它会刷新设备或CPU缓存中的数据,使得设备操作的是内存中最新的数据。 •dma_sync_single_for_device...
PURPOSE:To attain properly the access frequency of a DMA device and to improve processing ability by previously determining either a burst mode or an one-word mode should be used in accordance with the contents of work or priority, and storing the determined result in a memory. CONSTITUTION:Whe...
PURPOSE:To increase the high speed and extensive nature, by giving the processing functions such as the retrieval and pickup of data in an input and output device to a direct access control device DMA, in addition to the data transfer between input and output devices and main memory devices....