•Verilog中主要有两种数据类型:变量(variable)和线网(net)。这两种数据类型的区别在于它们的赋值和保持方式,它们代表了不同的硬件结构。 •线网用于逻辑门之间的连接,一般线网的值由driver决定(不能保存值),如果没有driver驱动,那么线网的值是z(高阻态)。在coding时一般只会用到wire变量,用于逻辑门的驱动或...
延迟链部分的IDELAYE3使用FIXED/COUNT模式,使用generate进行实例化,实例化个数×DELAY_VALUE应等于512,本文实例化64个,即相邻IDELAYE3相差8个delay_step,同时应保证CLK_PERIOD<512步进对应的时延(自测为2ns,即单步进4ps)。 激励信号产生 激励部分产生信号所用IDELAYE3使用VARIABLE/COUNT模式,实例化1个即可,控制逻辑...
Unlike a register, it can save the current value until another value is assigned to it. In the process of maintaining the current value, there is no need for the drive source to act on it. If no value is assigned to the register variable, its initial value is x. The register type va...
Verilog 2001 allows more than two dimensions with support for arrays of variable and net data types. In array assignments, Verilog 2001 allows part selection and variables to be used in part selection as shown in the example below. 1 module multi_array(); 2 3 reg read_v95, read_multi, ...
Then we have another common type of code, where one reg variable is driven from more than one always block. Well it will surely cause synthesis error.Example - Initial Statement 1 module synthesis_initial( 2 clk,q,d); 3 input clk,d; 4 output q; 5 reg q; 6 7 initial begin 8 q ...
term for a variable in a class is “property,” and a task or function is called a “method.” clocking block 中的input delay 和outputdelay: inputdelay:就是说我testbench需要你design在active edge 之前的这个delay输出有效的结果,我好进行分析比较。
$fsdbDumpon ; End Stopping and resuming the dump ($dumpoff/$dumpon) fsdbDumplimit - 限制 FSDB 文件 size -- $fsdbDumpvars([], *) fsdbDumpfile - 指定 FSDB 文件名 -- $fsdbDumpfile( “”) fsdbDumpvars - Dump 指定的变量 -- fsdbDumpSingle - Dump 指定的信号 fsdbDumpvariable - Dump ...
5) c = 0 ; // usese macro sum(a,b) Example2: A macro for an ADC with variable delay. `define var_adc(dly) adc #(dly) `var_adc(2) g121 (q21, n10, n11 ; `var_adc(5) g122 (q22, n10, n11) Displaying and Printing Results The `undef Compiler Directive 7-41 Use the `...
On the other side, $display outputs specific values or strings at set simulation times, serving for debugging or data analysis purposes without automatically tracking variable changes. Advanced Verilog Interview Questions for Experienced 36. What are transport delay and inertial delay? In Verilog, two...
Variable Declarations Example Initial Values Assigning an Initial Value to a Register Initial Values Example One Initial Values Example Two Arrays of Reg and Wire Arrays Example One Arrays Example Two Multi-Dimensional Arrays Multi-Dimensional Array Example One Multi-Dimensional Array Examp...