最好的测试方式便是使用TestBench和HDL仿真器来验证其正确性。...TestBench可以用VHDL或Verilog、SystemVerilog编写,本文以Verilog HDL为例。...FPGA设计必须采用Verilog中可综合的部分子集,但TestBench没有限制,任何行为级语法都可以使用。
Aforloop is the most widely used loop in software, but it is primarily used toreplicatehardware logic in Verilog. The idea behind aforloop is to iterate a set of statements given within the loop as long as the given condition is true. This is very similar to thewhileloop, but is used...
For Loop Example in VHDL and Verilog, used to extract replicated logic. How to write synthesizable for loops and use in testbench simulations.
这也是为什么verilog中要使用“<=”阻塞赋值的一个因素,因为阻塞赋值契合了实际电路中的这一特性,如果该FF之后又级联了一个FF,则在这个clk上升沿,如果不考虑时钟skew,那么后面级联的FF实际上采样到的数据还是前级FF赋值之前的数值,阻塞赋值可以保证这一特性。 所以在tb里initial块中一般使用 @ (posedge clk); start...
Current loop#5 Current loop#6 Current loop#7 Current loop#8 Current loop#9 设计中的例子 让我们看看如何在没有for循环的情况下在Verilog中实现8位左移位寄存器,然后将其与使用for循环的代码进行比较,以了解循环结构的实用性。 modulelshift_reg(inputclk,// clock inputinputrstn// Active low reset inputin...
Verilog中for语句的使用,简单testbench的写法 1,for语句的使用 `timescale 1ns/1ns module add16(a,b,c0,sum,cout); input [15:0] a,b; input c0; output [15:0] sum; output cout; reg [15:0] p,g,sum; reg [16:0] CA; reg cout;...
IS a fear of them interacting, because of Verilog's scheduling semantics that allows arbitrary interleaving of concurrent processes. As soon as you start writing testbench code that has time delays in loops, this becomes a very serious
// Note that ++ operator does not exist in Verilog ! for (i = 0; i < 10; i = i + 1) begin $display ("Current loop#%0d ", i); end end endmodule 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 运行结果: ncsim> run Current loop#0 ...
Verilog module for_loop_synthesis (i_Clock);input i_Clock;integer ii=0;reg [3:0] r_Shift_...
.in_b (b), .out_c (c4) ); Verilog Module Hierarchy When instantiating and connecting Verilog modules and ports, a hierarchical design is created. Every identifier (for example every module) has a unique hierarchical path name. This is useful generally in testbench coding, where you sometimes...