https://www.lishengxie.top/index.php/category/systemc/ https://www.lishengxie.top/index.php/archives/60/ 2023-02-02T15:04:00+08:00 视频教程教程链接创建模块#include <systemc.h> // SC_MODULE声明模块，and2对应模块名 SC_MODULE(and2){ // sc_in声明输入端口，DT对应端口变量数据类型 sc_in<DT> a; sc_in<DT> b; // 声明时钟信号 sc_in<bool> clk; // sc_out声明输出端口 sc_out<DT> f; void func() { // 输入端口读数据.read() // 输出端口写数据.write() f.write(a.read() & b.read()); } // 模块构造函数 SC_CTOR(and2){ // 声明线程 SC_METHOD(func); // 线程声明后紧接着声明敏感信号列表，以 << 号隔开 // 声明a和b为敏感信号 sensitive << a << b; // 声明clk的上升沿为敏感信号，下降沿为.neg() // sensitive << clk.pos(); } } Threads A function made to act like a hardware process Run concurrently; Sensitive to signals, clock edges or fixed amounts of simulation time; Not called by the user, always active 支持三种threads SC_METHOD() Executes once every sensitive event Run continuously 类似于Verilog @always block 可综合 组合逻辑或者简单时序逻辑 SC_THREAD() 只在simulation开始时运行一次 可以使用无限循环来以固定频率执行代码段 类似于Verilog @initial block 不可综合 在testbench中用于初始化、描述时钟等 SC_CTHREAD() "clocked thread" Run continuously References a clock edge 可综合 Can take one or more clock cycles to execute a single iteration Datatypes SystemC has bit-accurate Integer Datatypes Unsigned and signed sc_uint<N> N是位宽 sc_int<N> SC_CTHREAD Clocked Threads SC_METHOD限制 Limited to one cycle Fine for counters or simple sequential designs Not much different than hand coded RTL Can't handle multi-cycle algorithms SC_CTHREAD Not limited to one cycle Can contain continuous loops Can contain large blocks of code with operations or control Great for behavioral synthesis SC_CTHREAD是SC_CTHREAD的一种特殊情况，SC_CTHREAD能产生更好的综合效果。SC_CTHREAD中可以使用wait()函数。 SC_CTHREAD中第二个参数需要传入时钟参数，(clk,pos()/clk.neg()) SC_CTHREAD(fir_main, clk.pos()); reset_signal_is(rst, true); Testbench Top level structural module sc_main() funciton定义程序主函数 sc_signal<> 用于定义信号线连接模块之间的端口 sc_clock 定义clock信号 sc_clk clk_sig; // 构造函数中传入时钟信号，这里SC_NS指ns，10表示10ns为一个时钟周期 SC_CTOR(SYSTEM):clk_sig("clk_sig", 10, SC_NS) sc_start()、sc_stop()开始和终止仿真 Handshaking valid/ready信号组 Latency// 记录时间 sc_time start_time, end_time, clk_period; start_time = sc_time_stamp(); // 获取时钟周期, clk是之前声明的时钟信号 sc_clock *clk_p = DCAST<sc_clock*>(clk.get_interface()); clock_period = clk_p -> period(); C++ Segmentation Faulthttps://zhuanlan.zhihu.com/p/397148839