1 //===========================================
  2 // Function : Asynchronous read write RAM 
  3 // Coder    : Deepak Kumar Tala
  4 // Date     : 18-April-2002
  5 //===========================================
  6 #include "systemc.h"
  7 
  8 #define DATA_WIDTH        8 
  9 #define ADDR_WIDTH        8 
 10 #define RAM_DEPTH        1 << ADDR_WIDTH
 11 
 12 SC_MODULE (ram_sp_ar_aw) {
 13   sc_in    <sc_uint<ADDR_WIDTH> > address ;
 14   sc_in    <bool>                 cs      ;
 15   sc_in    <bool>                 we      ;
 16   sc_in    <bool>                 oe      ;
 17   sc_in    <sc_uint<DATA_WIDTH> > data_in ;
 18   sc_out   <sc_uint<DATA_WIDTH> > data_out;
 19 
 20   //-----------Internal variables-------------------
 21   sc_uint <DATA_WIDTH> mem [RAM_DEPTH];
 22 
 23   // Memory Write Block 
 24   // Write Operation : When we = 1, cs = 1
 25   void write_mem () {
 26     if (cs.read() && we.read()) {
 27       mem[address.read()] = data_in.read();
 28     }
 29   }
 30 
 31   // Memory Read Block 
 32   // Read Operation : When we = 0, oe = 1, cs = 1
 33   void read_mem () {
 34     if (cs.read() &&  ! we.read() && oe.read())  {
 35       data_out.write(mem[address.read()]);
 36     }
 37   }
 38 
 39   SC_CTOR(ram_sp_ar_aw) {
 40     SC_METHOD (read_mem);
 41       sensitive << address << cs << we << oe;
 42     SC_METHOD (write_mem);
 43       sensitive << address << cs << we << data_in;
 44   }
 45 
 46 };

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