描述下面这段代码完成的逻辑功能。always @ (posedge sys_clk or negedge sys_rst_n) beginif (sys_rst_n == 1'b0)led <= 1'b1;else beginif (switch)led <= 1'b0;elseled <= 1'b1;endend 答案:当复位信号为低电平时,led灯点亮。反之,当摁下switch 键,led灯熄灭,不摁下,led灯点亮。
always@(posedge sys_clk or negedge sys_rst_n) if(sys_rst_n == 1'b0) rx_reg3 <= 1'b1; else rx_reg3 <= rx_reg2; //start_nedge:检测到下降沿时start_nedge产生一个时钟的高电平 always@(posedge sys_clk or negedge sys_rst_n) if(sys_rst_n == 1'b0) start_nedge <= 1'b0;...
verilog为什么会出现这些警告,//module pll2(clk,rst_b,sysclk);input clk;input rst_b;output sysclk;reg sysclk;reg [2:0] time_cnt;reg [2:0] time_cnt_n;reg inputs_reg1;reg inputs_reg2;always @ (posedge clk) //对输入信号寄存两拍begininpu
always_ff @(posedge clk) begin for (init_statement; condition; increment) begin // 逻辑代码 end end 在这个格式中,init_statement是循环变量的初始化语句,condition是循环条件,increment是循环变量的增量语句。每次时钟上升沿时,循环变量会根据增量语句进行更新,并检查循环条件是否满足。如果条件满足,就会执行循环...
(posedge sys_clk or negedge sys_rst_n) begin if (!sys_rst_n) sys_clk_pixel <= 1'b0; else sys_clk_pixel <= ~sys_clk_pixel; end //行坐标和纵坐标 always @ (posedge sys_clk_pixel) begin if (!sys_rst_n) begin x_count <= 0; y_count <= 0; end else if (x_count == ...
always@(posedge sys_clk or negedge sys_rst_n) if(sys_rst_n == 1'b0) rx_reg1 <= 1'b1; else rx_reg1 <= rx; //rx_reg2:第二级寄存器,寄存器空闲状态复位为1 always@(posedge sys_clk or negedge sys_rst_n) if(sys_rst_n == 1'b0) ...
always@(posedge sys_clk or negedge sys_rst_n) if(sys_rst_n == 1'b0) rx_reg1 <= 1'b1; else rx_reg1 <= rx; //rx_reg2:第二级寄存器,寄存器空闲状态复位为1 always@(posedge sys_clk or negedge sys_rst_n) if(sys_rst_n == 1'b0) ...