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xilinx axi datamover IP使用demo

news 2025/7/1 14:03:00

官方使用手册：
https://docs.amd.com/v/u/5.0-English/pg022_axi_datamover
功能说明：这个IP主要实现在axi 内存地址总线搬移数据，用户只需要配置CMD接口的起始地址和搬移数据字节数，就可以通过axi stream S2MM接口将数据搬移到指定axi 内存总线地址，将数据从指定axi内存总线地址中搬移出来通过axi stream MM2S接口输出。
1、为了方便代码编写，基于BD简单搭建了一个小工程，主要实现通过datamover读写axi 总线接口的bram数据
在这里插入图片描述

IP配置如下：
在这里插入图片描述

2、顶层控制代码如下

module test_top(input clk_i,input rst_i_n
);
//================================================================================localparam IDLE     = 3'd0;//空闲localparam WR_CMD   = 3'd1;//S2MM写命令localparam WR_BURST = 3'd2;//S2MM数据搬移localparam RD_CMD   = 3'd3;//MM2S写命令localparam RD_BURST = 3'd4;//MM2S数据搬移localparam RST      = 3'd5;//复位localparam BURST_LEN= 23'h80;//测试搬移数据总字节数reg  [2:0]  state   = IDLE;wire [31:0] M_AXIS_MM2S_0_tdata;wire [3:0]  M_AXIS_MM2S_0_tkeep;wire        M_AXIS_MM2S_0_tlast;wire        M_AXIS_MM2S_0_tready;wire        M_AXIS_MM2S_0_tvalid;reg  [71:0] S_AXIS_MM2S_CMD_0_tdata;wire        S_AXIS_MM2S_CMD_0_tready;reg         S_AXIS_MM2S_CMD_0_tvalid;reg  [31:0] S_AXIS_S2MM_0_tdata;reg  [3:0]  S_AXIS_S2MM_0_tkeep;reg         S_AXIS_S2MM_0_tlast;wire        S_AXIS_S2MM_0_tready;reg         S_AXIS_S2MM_0_tvalid;reg  [71:0] S_AXIS_S2MM_CMD_0_tdata;wire        S_AXIS_S2MM_CMD_0_tready;reg         S_AXIS_S2MM_CMD_0_tvalid;  design_1_wrapper design_1_i(.M_AXIS_MM2S_0_tdata(M_AXIS_MM2S_0_tdata),.M_AXIS_MM2S_0_tkeep(M_AXIS_MM2S_0_tkeep),.M_AXIS_MM2S_0_tlast(M_AXIS_MM2S_0_tlast),.M_AXIS_MM2S_0_tready(M_AXIS_MM2S_0_tready),.M_AXIS_MM2S_0_tvalid(M_AXIS_MM2S_0_tvalid),.S_AXIS_MM2S_CMD_0_tdata(S_AXIS_MM2S_CMD_0_tdata),.S_AXIS_MM2S_CMD_0_tready(S_AXIS_MM2S_CMD_0_tready),.S_AXIS_MM2S_CMD_0_tvalid(S_AXIS_MM2S_CMD_0_tvalid),.S_AXIS_S2MM_0_tdata(S_AXIS_S2MM_0_tdata),.S_AXIS_S2MM_0_tkeep(S_AXIS_S2MM_0_tkeep),.S_AXIS_S2MM_0_tlast(S_AXIS_S2MM_0_tlast),.S_AXIS_S2MM_0_tready(S_AXIS_S2MM_0_tready),.S_AXIS_S2MM_0_tvalid(S_AXIS_S2MM_0_tvalid),.S_AXIS_S2MM_CMD_0_tdata(S_AXIS_S2MM_CMD_0_tdata),.S_AXIS_S2MM_CMD_0_tready(S_AXIS_S2MM_CMD_0_tready),.S_AXIS_S2MM_CMD_0_tvalid(S_AXIS_S2MM_CMD_0_tvalid),.clk_i(clk_i),.rst_n(rst_i_n && (state != RST))
);    
//========================================main===================================//
//CMD命令，一般的读写只需要关注BIT(搬移数据长度)和SADDR地址字段
always @(posedge clk_i) beginS_AXIS_MM2S_CMD_0_tdata <= {4'd0        ,   //[71:68]   RSVD4'd0        ,   //[67:64]   TAG32'd0       ,   //[63:32]   SADDR   32bit axi address1'd0        ,   //[31]      DRR1'd1        ,   //[30]      EOF6'd0        ,   //[29:24]   DSA1'd1        ,   //[23]      Type       BURST_LEN       //[22:0]    BIT};S_AXIS_S2MM_CMD_0_tdata <= {4'd0        ,   //[71:68]   RSVD4'd0        ,   //[67:64]   TAG32'd0       ,   //[63:32]   SADDR   32bit axi address1'd0        ,   //[31]      DRR1'd1        ,   //[30]      EOF6'd0        ,   //[29:24]   DSA1'd1        ,   //[23]      Type       BURST_LEN       //[22:0]    BIT};
endassign M_AXIS_MM2S_0_tready    = 'd1;
always @(posedge clk_i) beginif (rst_i_n == 0) beginstate               <= RST;S_AXIS_S2MM_0_tdata <= 'd0;S_AXIS_S2MM_0_tkeep <= 'd0;S_AXIS_S2MM_0_tlast <= 'd0;S_AXIS_S2MM_0_tvalid <= 'd0;S_AXIS_S2MM_CMD_0_tvalid <= 'd0;S_AXIS_MM2S_CMD_0_tvalid <= 'd0;endelse begincase (state)RST: beginstate <= IDLE;endIDLE: beginstate <= WR_CMD;S_AXIS_S2MM_0_tdata         <= 'd0;S_AXIS_S2MM_0_tkeep         <= 'd0;S_AXIS_S2MM_0_tlast         <= 'd0;S_AXIS_S2MM_0_tvalid        <= 'd0;S_AXIS_S2MM_CMD_0_tvalid    <= 'd0;S_AXIS_MM2S_CMD_0_tvalid    <= 'd0;endWR_CMD: begin   if (S_AXIS_S2MM_CMD_0_tvalid && S_AXIS_S2MM_CMD_0_tready) beginstate                   <= WR_BURST;S_AXIS_S2MM_CMD_0_tvalid <= 'd0;endelse beginS_AXIS_S2MM_CMD_0_tvalid <= 'd1;endendWR_BURST: begin   S_AXIS_S2MM_0_tkeep <= 'hffff;if (S_AXIS_S2MM_0_tvalid && S_AXIS_S2MM_0_tready) beginS_AXIS_S2MM_0_tdata     <= S_AXIS_S2MM_0_tdata + 'd1;if (S_AXIS_S2MM_0_tdata == BURST_LEN/4-2) begin//data width is 32,4byteS_AXIS_S2MM_0_tlast <= 'd1;endelse beginS_AXIS_S2MM_0_tlast <= 'd0;endendelse beginS_AXIS_S2MM_0_tlast     <= 'd0;endif (S_AXIS_S2MM_0_tvalid && S_AXIS_S2MM_0_tready && S_AXIS_S2MM_0_tlast) beginstate                   <= RD_CMD;S_AXIS_S2MM_0_tvalid    <= 'd0;endelse beginS_AXIS_S2MM_0_tvalid    <= 'd1;endendRD_CMD: begin   if (S_AXIS_MM2S_CMD_0_tvalid && S_AXIS_MM2S_CMD_0_tready) beginstate                   <= RD_BURST;S_AXIS_MM2S_CMD_0_tvalid<= 'd0;endelse beginS_AXIS_MM2S_CMD_0_tvalid<= 'd1;endendRD_BURST: begin   if (M_AXIS_MM2S_0_tvalid && M_AXIS_MM2S_0_tready && M_AXIS_MM2S_0_tlast) beginstate <= IDLE;endenddefault: beginstate <= IDLE;endendcaseend
endendmodule

需要注意的是一定要满足axi stream规范，S2MM的tlast不能早或者晚来。
CMD的data每个bit解释参考文档说明：
在这里插入图片描述

只需要给个简单的测试激励就可以仿真了：

module tb_top();
reg clk_i = 0;
reg rst_n = 0;
always #10 clk_i = ~clk_i;
initial beginrst_n = 0;#100rst_n = 1;endtest_top test_top(.clk_i(clk_i),.rst_i_n(rst_n));
endmodule