The file_name and memory_nameare memory_start and memory_finish are optional, it missed out they default to the start index of the named memory and the end of the named memory respectively.Memories can be stored in a file in the format shown below, the address is specified as @, where the address is Read More
在进行HDL的仿真测试时，除了用较为直观的波形仿真图像以外，通过编写测试文件testbench进行仿真并将仿真结果保存在对应的文件，显得尤为重要。文件的操作主要用到读和写两种操作。1. 读操作读操作用到的语句是:$readmemb()或$readmemh()。以$readmemb()为例，它的调用为$readmemb（"file_name",memory)file_name:可以是.txt、.doc等格式的文件，但必须遵守ROM的规范，即其内容形式必须如下：@0001010_01001010010010101010@01000010100101001001_0010010. Read More
采用流水线结构的CIC 抽取滤波器结构如下：// 三级CIC抽取器实例：cic3_decimator.Vmodule cic3_decimator(clk, x_in, y_out); parameter STATE_HOLD = 1'b0, STATE_SAMPLE = 1'b1; input clk; // 输入时钟 input [7:0] x_in; // 输入8位数据 output [25:0] y_out; // 输出26位数据 reg state, derived_clk; reg [4:0] cou... Read More