SystemC学习（3）— APB_SRAM的建模与测试
一、前言
二、APB_SRAM建模
编写APB_SRAM模型文件apb_sram.h文件如下所示：
#ifndef __APB_SRAM_H
#define __APB_SRAM_H#include "systemc.h"const int ADDR_SIZE = 32;
const int DATA_SIZE = 32;SC_MODULE(apb_sram){sc_in<bool> apb_pclk;sc_in<bool> apb_presetn;sc_in<bool> apb_psel;sc_in<bool> apb_penable;sc_in<bool> apb_pwrite;sc_in<sc_uint<ADDR_SIZE> > apb_paddr;sc_in<sc_uint<DATA_SIZE> > apb_pwdata;sc_out<sc_uint<DATA_SIZE> > apb_prdata;sc_out<bool> apb_pready;sc_out<bool> apb_pslverr;sc_bv<DATA_SIZE> mem[4096];SC_CTOR(apb_sram){SC_METHOD(prc_apb_sram); sensitive << apb_pclk.pos();sensitive << apb_presetn.neg();}void prc_apb_sram(){if(!apb_presetn){apb_prdata = 0;apb_pready = 0;apb_pslverr = 0;}else if((apb_psel.read()==1) && (apb_penable.read()==0) && (apb_pwrite.read()==0)) {apb_prdata = mem[(apb_paddr.read()>>2)];}else if((apb_psel.read()==1) && (apb_penable.read()==1) && (apb_pwrite.read()==0)) {apb_pready = 1;}else if((apb_psel.read()==1) && (apb_penable.read()==1) && (apb_pwrite.read()==1)) {mem[(apb_paddr.read()>>2)] = apb_pwdata;apb_pready = 1;}else {apb_prdata = apb_prdata;apb_pready = 0;}}
};#endif三、测试平台
编写“driver.h”如下所示：
#ifndef __DRIVER_H
#define __DRIVER_H#include "apb_sram.h"SC_MODULE(driver){sc_in<bool> apb_pclk;sc_out<bool> apb_presetn;sc_out<bool> apb_psel;sc_out<bool> apb_penable;sc_out<bool> apb_pwrite;sc_out<sc_uint<ADDR_SIZE> > apb_paddr;sc_out<sc_uint<DATA_SIZE> > apb_pwdata;sc_in<sc_uint<DATA_SIZE> > apb_prdata;sc_in<bool> apb_pready;sc_in<bool> apb_pslverr;SC_CTOR(driver){SC_THREAD(prc_test);sensitive << apb_pclk.pos();}void prc_test(){apb_presetn.write(0);apb_psel.write(0);apb_penable.write(0);apb_pwrite.write(0);apb_paddr.write(0);apb_pwdata.write(0);wait();wait();apb_presetn.write(1);wait();wait();// writefor(int i=0; i<16; i++) {apb_psel.write(1);apb_penable.write(0);apb_pwrite.write(1);apb_paddr.write(i*4);apb_pwdata.write(i);wait();apb_penable.write(1);wait();while(apb_pready.read() != 1){wait();}apb_psel.write(0);apb_penable.write(0);wait();wait();}// readfor(int i=0; i<16; i++) {apb_psel.write(1);apb_penable.write(0);apb_pwrite.write(0);apb_paddr.write(i*4);wait();apb_penable.write(1);wait();while(apb_pready.read() != 1){wait();}apb_psel.write(0);apb_penable.write(0);wait();wait();}sc_stop();}};#endif四、测试运行
使用如下命令进行编译：
g++ main.cpp -I${SYSTEMC_HOME}/include/ -L${SYSTEMC_HOME}/lib-linux64 -lsystemc -o run.x
运行命令：
./run.x
打开test.vcd 文件可看到波形如下所示：
