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Diffstat (limited to 'ee4363/mp1/mipspipe.v')
-rw-r--r-- | ee4363/mp1/mipspipe.v | 90 |
1 files changed, 0 insertions, 90 deletions
diff --git a/ee4363/mp1/mipspipe.v b/ee4363/mp1/mipspipe.v deleted file mode 100644 index 951bde0..0000000 --- a/ee4363/mp1/mipspipe.v +++ /dev/null @@ -1,90 +0,0 @@ -// Incomplete behavioral model of MIPS pipeline - -module mipspipe(clock); - // in_out - input clock; - - // Instruction opcodes - parameter LW = 6'b100011, SW = 6'b101011, BEQ = 6'b000100, nop = 32'b00000_100000, ALUop = 6'b0; - reg [31:0] PC, // Program counter - Regs[0:31], // Register file - IMemory[0:1023], DMemory[0:1023], // Instruction and data memories - IFIDIR, IDEXA, IDEXB, IDEXIR, EXMEMIR, EXMEMB, // pipeline latches - EXMEMALUOut, MEMWBValue, MEMWBIR; // pipeline latches - - wire [4:0] IDEXrs, IDEXrt, EXMEMrd, MEMWBrd, MEMWBrt; // fields of pipeline latches - wire [5:0] EXMEMop, MEMWBop, IDEXop; // opcodes - wire [31:0] Ain, Bin; // ALU inputs - - // Define fields of pipeline latches - assign IDEXrs = IDEXIR[25:21]; // rs field - assign IDEXrt = IDEXIR[20:16]; // rt field - assign EXMEMrd = EXMEMIR[15:11]; // rd field - assign MEMWBrd = MEMWBIR[15:11]; // rd field - assign MEMWBrt = MEMWBIR[20:16]; // rt field -- for loads - assign EXMEMop = EXMEMIR[31:26]; // opcode - assign MEMWBop = MEMWBIR[31:26]; // opcode - assign IDEXop = IDEXIR[31:26]; // opcode - - // Inputs to the ALU come directly from the ID/EX pipeline latches - assign Ain = IDEXA; - assign Bin = IDEXB; - reg [5:0] i; //used to initialize registers - reg [10:0] j,k; //used to initialize registers - - initial begin - PC = 0; - IFIDIR = nop; - IDEXIR = nop; - EXMEMIR = nop; - MEMWBIR = nop; // no-ops placed in pipeline latches - // test some instructions - for (i=0;i<=31;i=i+1) Regs[i] = i; // initialize registers - IMemory[0] = 32'h8c210003; - IMemory[1] = 32'hac020000; - IMemory[2] = 32'h00642820; - for (j=3;j<=1023;j=j+1) IMemory[j] = nop; - DMemory[0] = 32'h00000000; - DMemory[1] = 32'hffffffff; - for (k=2;k<=1023;k=k+1) DMemory[k] = 0; - end - - always @ (posedge clock) - begin - // FETCH: Fetch instruction & update PC - IFIDIR <= IMemory[PC>>2]; - PC <= PC + 4; - - // DECODE: Read registers - IDEXA <= Regs[IFIDIR[25:21]]; - IDEXB <= Regs[IFIDIR[20:16]]; // get two registers - - IDEXIR <= IFIDIR; // pass along IR - - // EX: Address calculation or ALU operation - if ((IDEXop==LW) |(IDEXop==SW)) // address calculation - EXMEMALUOut <= IDEXA +{{16{IDEXIR[15]}}, IDEXIR[15:0]}; - else if (IDEXop==ALUop) begin // ALU operation - case (IDEXIR[5:0]) // R-type instruction - 32: EXMEMALUOut <= Ain + Bin; // add operation - default: ; // other R-type operations [to be implemented] - endcase - end - - EXMEMIR <= IDEXIR; EXMEMB <= IDEXB; //pass along the IR & B - - // MEM - if (EXMEMop==ALUop) MEMWBValue <= EXMEMALUOut; //pass along ALU result - else if (EXMEMop == LW) MEMWBValue <= DMemory[EXMEMALUOut>>2]; // load - else if (EXMEMop == SW) DMemory[EXMEMALUOut>>2] <=EXMEMB; // store - - MEMWBIR <= EXMEMIR; //pass along IR - - // WB - if ((MEMWBop==ALUop) & (MEMWBrd != 0)) // update registers if ALU operation and destination not 0 - Regs[MEMWBrd] <= MEMWBValue; // ALU operation - else if ((MEMWBop == LW)& (MEMWBrt != 0)) // Update registers if load and destination not 0 - Regs[MEMWBrt] <= MEMWBValue; - end - -endmodule |