我是靠谱客的博主 孤独饼干,这篇文章主要介绍SystemC自带example的cpu之Data Cache研习,现在分享给大家,希望可以做个参考。

        例子中并没有数据缓冲的体现,和指令缓冲一样,仅仅就是RAM的读写设计。上来先是对RAM内容进行初始化,然后就是根据输入的使能信号和读写地址,直接进行相应的操作了。

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struct dcache : sc_module { sc_in<signed> datain; // input data sc_in<unsigned> statein; // input state bit MESI(=3210) sc_in<bool> cs; // chip select sc_in<bool> we; // write enable sc_in<unsigned > addr; // address sc_in<unsigned> dest; // write back to which register sc_out<unsigned> destout; // write back to which register sc_out<signed> dataout; // dataram data out sc_out<bool> out_valid; // output valid sc_out<unsigned> stateout; // state output sc_in_clk CLK; // Parameter unsigned *dmemory; // data memory unsigned *dsmemory; // data state memory unsigned *dtagmemory; // tag memory int wait_cycles; // cycles # it takes to access dmemory void init_param(int given_delay_cycles) { wait_cycles = given_delay_cycles; } //Constructor SC_CTOR(dcache) { SC_CTHREAD(entry, CLK.pos()); // initialize instruction dmemory from external file FILE *fp = fopen("dcache.img","r"); int size=0; int i=0; unsigned mem_word; dmemory = new unsigned[4000]; dsmemory = new unsigned[4000]; dtagmemory = new unsigned[4000]; printf("** ALERT ** DCU: initialize Data Cachen"); while (fscanf(fp,"%x", &mem_word) != EOF) { dmemory[size] = mem_word; dsmemory[size] = 0; dtagmemory[size] = size; size++; } for (i=size; i<4000; i++) { dtagmemory[i] = 0xdeadbeef; dmemory[i] = 0xdeadbeef; dsmemory[i] = 0; } } // Process functionality in member function below void entry(); }; void dcache::entry() { unsigned int address; // address to DataCache unsigned int dest_tmp = 0; while (true) { do { wait(); } while ( !(cs == true) ); dest_tmp = dest.read(); address = addr.read(); if (we.read() == true) { // Write operation wait(); out_valid.write(false); dmemory[address] = datain.read(); dsmemory[address] = statein.read(); dtagmemory[address] = addr.read(); wait(); } else { // Read operation wait(); dataout.write(dmemory[address]); stateout.write(dsmemory[address]); destout.write(dest_tmp); out_valid.write(true); if (dsmemory[address] == 3) { printf(" (M)"); } else if (dsmemory[address] == 2) { printf(" (E)"); } else if (dsmemory[address] == 1) { printf(" (S)"); } else if (dsmemory[address] == 0) { printf(" (I)"); } else printf(" (X)"); wait(); out_valid.write(false); wait(); } } } // end of entry function

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