You are required to modify the Tristate Bus to add an Adder.  The adder will add the contents of registers A and B and store the result into register A, B, or C.  

module datapathBus(
  inout [7:0] dataBus,
  // Control Signals
  input enbIn, enbA, enbB, enbC,
  input ldA, ldB, ldC,
  //
  input reset,
  input clock);

  wire [7:0] dataOutA, dataOutB, dataOutC;

  tristateBuf triBufIn(dataBus, dataBus, enbIn);

  tristateBuf triBufA(dataOutA, dataBus, enbA);
  tristateBuf triBufB(dataOutB, dataBus, enbB);
  tristateBuf triBufC(dataOutC, dataBus, enbC);

  eightBitRegister regA(dataBus, dataOutA, ldA, reset, clock);
  eightBitRegister regB(dataBus, dataOutB, ldB, reset, clock);
  eightBitRegister regC(dataBus, dataOutC, ldC, reset, clock);

endmodule

 

Input data Eni Lda Clock Ena Reg. A 8 Enb Ldb- Tristate bus Reg. B 8X Ldc Enc Reg. C