///////////////////////////////////////////////////////////////////////
//
// cpu_core module
//
///////////////////////////////////////////////////////////////////////


module cpu_core( Data_out, Data_in, ENB, nME, ALE, RnW, nOE, SDO,
                 nIRQ, nWait, Clock, nReset, Test, SDI );

//
// I/O declarations
//

output [15:0] Data_out;
input [15:0] Data_in;

output ENB;
output nME, ALE, RnW, nOE, SDO;

input Clock, nReset, Test, SDI;
input nIRQ, nWait;

wire [3:0] Function;
wire [3:0] Opcode;

//
// This system does support a scan path
//
// The main SDI connects to the SDI of the datapath
// The main SDO connects to the SDO of the control unit
// A signal named SDmid connects between the SDO of the datapath
//   and the SDI of the control unit
//

//
// This system is built from two smaller modules
//

control Control (
  .Function(Function),
  .SelInc(SelInc),
  .LoadPC(LoadPC),
  .LoadIR(LoadIR),
  .TrisOperand(TrisOperand),
  .TrisPC(TrisPC),
  .TrisAcc(TrisAcc),
  .TrisMem(TrisMem),
  .ENB(ENB),
  .nME(nME),
  .ALE(ALE),
  .RnW(RnW),
  .nOE(nOE),
  .Opcode(Opcode),
  .Zflag(Zflag),
  .nWait(nWait),
  .Clock(Clock),
  .nReset(nReset),
  .Test(Test),
  .SDI(SDmid),
  .SDO(SDO)
);

datapath Datapath (
  .SysBus(Data_out),
  .Data_in(Data_in),
  .Opcode(Opcode),
  .Zflag(Zflag),
  .Function(Function),
  .SelInc(SelInc),
  .LoadPC(LoadPC),
  .LoadIR(LoadIR),
  .TrisOperand(TrisOperand),
  .TrisPC(TrisPC),
  .TrisAcc(TrisAcc),
  .TrisMem(TrisMem),
  .Clock(Clock),
  .nReset(nReset),
  .Test(Test),
  .SDI(SDI),
  .SDO(SDmid)
);


endmodule