使用DMA:当我们要使用到DMA的时候,需要把传输的源(物理地址)、目的(物理地址)、大小告诉DMA,然后启动DMA,就能进行数据移动了。那么什么时候DMA会结束呢,当DMA传输结束的时候会发出一个中断,我们可以在该中断处理程序内部做进一步的操作(如打印消息等)。 DW_axi_dmac 是一个高度可配置、高度可编程、高性能的多主控...
如果用过ZYNQ/ZYNQMP SOC的都知道,要直接操作PS的DDR 通常是DMA 或者VDMA,然而用过XILINX 的DMA IP 和VDMA IP,总有一种遗憾,那就是不够灵活,还需要对寄存器配置,真是麻烦。XILINX 的总线接口是AXI4总线,自定义AXI4 IP挂到总线上就能实现对内存地址空间的读写访问。因此,我们只要掌握AXI4协议就能完成不管是PS...
req信号是自动管理每次axi需要burst的长度always @(posedge M_AXI_ACLK)wburst_len_req <= fdma_wstart|axi_wlast;// fdma_wleft_cnt用于记录一次FDMA剩余需要传输的数据数量always @(posedge M_AXI_ACLK)if( fdma_wstart )beginwfdma_cnt <= 1'd0;fdma_wleft_cnt <= fdma_wsize;endelse if(w_next)...
FDMA是米联客的基于AXI4总线协议定制的一个DMA控制器。有了这个IP我们可以统一实现用FPGA代码直接读写PL的DDR或者PS的DDR。本文中FDMA的IP是开源的,在配套FPGA工程的uisrc/ip路径下可以找到源码。本文的IP已经利用VIVADO做了图形化的封装,所以可以直接通过图形化连线设计,使用非常方便。 本文实验目的: 1:利用米联客...
I have a block design with AXI_DMA IP included, and I have verify it with bare metal system. Then I follow the README to build the driver/device tree/app. The "axidma.ko" can be inserted successfully, but the example apps all fail with "...
m_axiMaster-AXIIOThe Eye-ScanDMAinterface, must be connected to a memory slave. This interface is available only if parameter TX_OR_RX_N is set to 0x0. up_cm_*Common-DRPIOThe common DRP interface, must be connected to the equivalent DRP ports of UTIL_ADXCVR. This is a QUAD interface...
31:9 Reserved Always 0 8:5 Card Stat SD card controller state 4:3 Card Type SD Card Type 2 INT Interrupt hang (write 1 to this bit to clear the interrupt) 1 DMA Error DMA write Memory send error 0 BUSY In transit (1 means in transit, 0 means idle) The values and meanings of ...
The CPU memory unit doesn’t need AXI IDs. While a CPU might use two separate AXI IDs, only one would ever be needed for any source. Therefore, the fetch unit might use one ID and the memory controller another. If a DMA were integrated into the CPU, it might use a third ID and ...
Status REG: 00010049 (Halt Busy SG - - DecErr - - - - - - th 1 dly 0) Cur BD REG: 01B800C0 Tail BD REG: 01B800C0 SG Control REG: 00000003 Questions: 1) Is the built-in DMA usable for QSPI transfers ? -- If Yes, why are the results we're seeing inconsistent ? 2) How ...
reg [1:0] DMA_WRITE_STATUS; assign IRQ_F2P_pin = DMA_WRITE_STATUS[1]; // write dma busy status configuration always @(posedge M_APB_PCLK_pin) begin if (!M_APB_PRESETN_pin) begin DMA_WRITE_STATUS[0] <= 1'b0; end else if(dma_frame_write_end) begin ...