fifo_buffer[wr_ptr_true] <= data_in;endend//将读指针的格雷码同步到写时钟域,来判断是否写满always@ (posedgewr_clkornegedgewr_rst_n)beginif(!wr_rst_n)beginrd_ptr_g_d1 <=0;//寄存1拍rd_ptr_g_d2 <=0;//寄存2拍endelsebeginrd_ptr_g_d1 <= rd_ptr_g;//寄存1拍rd_ptr_g_d2 ...
pop(r_data);77pop(r_data);78pop(r_data);79pop(r_data);80#100$stop;81end8283taskpush (input[7:0] data);84if(o_buf_full)85$display("Cannot push %d: Buffer Full",data);86elsebegin87$display("Push",,data);88i_data=data;89i_w_en=1;90@(posedgei_clk) #4i_w_en=0;//时...
在异步FIFO的实现中,读写指针的变化,我们仍然使用二进制加,之后将变化后的二进制通过组合逻辑转换为格雷码即可。 二进制转换为格雷码以及格雷码转换为二进制的方法,我们可以参考我以前的博文:二进制与格雷码之间的转换的Verilog实现(更多一点的讨论),这篇文章还顺便提到了generate for以及for语句的区别,推荐阅读。 这里为...
parameterDATA_WIDTH=8;parameterDATA_DEPTH=8;reg[DATA_WIDTH-1:0]fifo_buffer[0:DATA_DEPTH-1];reg[$clog2(DATA_DEPTH)-1:0]wr_pointer=0;reg[$clog2(DATA_DEPTH)-1:0]rd_pointer=0; 例如我定义了FIFO缓冲区的深度为DATA_DEPTH = 8,那么其地址(指针)位宽是多少呢?这时候就可以使用系统函数 $cl...
$display("Cannot Pop: Buffer Empty"); else begin i_r_en=1; @(posedge i_clk) #4 i_r_en= 0; //时钟上升沿4ns后,读使能清零 data = o_data; $display("Pop:",,data); end endtask endmodule 采用Modelsim仿真得到如下波形: 可以在Modelsim的View——Transcript窗口看到有如下打印信息: ...
fifo_counter is incremented ifwrite takes place and buffer is not full and will be decremented id read takesplace and buffer is not empty. If both read and write takes place, counter willremain the same. fifo_counter写而未满时增加1,读而未空时减1。同时发生读写操作时,fifo_counter不变。
View Code 1、系统函数$clog2();求对数函数。使用方法很简单,主要求指针的位宽来使用。例如: 1 parameter DATA_WIDTH = 8; 2 parameter DATA_DEPTH = 8; 3 4 reg [DATA_WIDTH - 1 : 0] fifo_buffer[0 : DATA_DEPTH - 1]; 5 6 reg [$clog2(DATA_DEPTH) - 1 : 0] wr_pointer = 0; ...
fifo_counter is incremented ifwrite takes place and buffer is not full and will be decremented id read takesplace and buffer is not empty. If both read and write takes place, counter willremain the same. fifo_counter写而未满时增加1,读而未空时减1。同时发生读写操作时,fifo_counter不变。
mihir8181/VerilogHDL-Codes Star32 Code Issues Pull requests Synthesizable Verilog Source Codes(DUT), Test-bench and Simulation Results. counterfsmasynchronousverilogfifotestbenchesverilog-hdlverilog-programsmealy-machine-codemoore-machine-codeverilog-projectfifo-bufferverilog-coden-bit-aluverilogvalidationdesign...
rd_data<=fifo_buffer[rd_addr];rd_pointer<=rd_pointer;end end endmodule 2、仿真文件 改变clk_period_wr和clk_period_rd就可以实现读写快慢切换 代码语言:javascript 代码运行次数:0 运行 AI代码解释 `timescale 1ns / 1ns`define clk_period_wr50`define clk_period_rd 20 ...