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//SWAP Instruction 9'b0???????1: imm_32 = 32'h00000000; //Immediate Rotates default: imm_32 = {24'h000000,ir[7:0]}; endcase end//Create the 8-bit Immediate Value used as Shift Amountalways @(ir or Rs or branch or ldrh or cop_mem_id or ldm or stm or stri or ldri or strh) begin if (ir[27:25] == 3'h1) //ALU with Rotated Immediate or imm_8 = {3'h0, Rs, 1'h0}; //MSR with Rotated Immediate else if (branch || ldrh || stri || ldri || ldm || stm || strh) imm_8 = 8'h00; else if (cop_mem_id) imm_8 = 8'h2; else imm_8 = {2'h0,ir[11:7]}; end//Mux the Forwarding Data for Op1//Priority is Important Here!!!always @(write_Rd_ex or Rd_ex or index_a or write_Rn_ex or Rn_ex or write_Rd_me or Rd_me or base_ex or write_Rn_me or Rn_me or ex_result or me_result or base_me) begin if ((write_Rd_ex) && (index_a == Rd_ex)) forwarded_op1 = ex_result; else if ((write_Rn_ex) && (index_a == Rn_ex)) forwarded_op1 = base_ex; else if ((write_Rd_me) && (index_a == Rd_me)) forwarded_op1 = me_result; else forwarded_op1 = base_me; end//Mux the Forwarding Data for Op2//Priority is important here!!!always @(write_Rd_ex or Rd_ex or index_b or write_Rn_ex or Rn_ex or write_Rd_me or Rd_me or base_ex or write_Rn_me or Rn_me or ex_result or me_result or base_me) begin if ((write_Rd_ex) && (index_b == Rd_ex)) forwarded_op2 = ex_result; else if ((write_Rn_ex) && (index_b == Rn_ex)) forwarded_op2 = base_ex; else if ((write_Rd_me) && (index_b == Rd_me)) forwarded_op2 = me_result; else forwarded_op2 = base_me; end //Set Op1always @(rf_a or forward_op1 or forwarded_op1 or pc_if or branch or und or swi or exception_id) begin if (branch | und | swi | exception_id) //Op1 is PC op1 = pc_if; else if (forward_op1) //Op1 from Unwritten Result op1 = forwarded_op1; else //Op1 is Rn/Rs op1 = rf_a; end//Set Op2always @(branch or ir or forward_op2 or forwarded_op2 or index_b or imm_32 or op2_is_imm or rf_b) begin if (branch) //Op2 is Branch Offset op2 = {{6{ir[23]}},ir[23:0],2'b00}; else if (forward_op2) //Op2 from Unwritten result op2 = forwarded_op2; else if (op2_is_imm) //Op2 is Imm Value op2 = imm_32; else //Op2 is Rm/Rd op2 = rf_b; end//Set up the Auxillary Data Operandalways @(forward_aux or rf_b or forwarded_op2) begin if (forward_aux) aux_data_id = forwarded_op2; else aux_data_id = rf_b; end//Set the Shift Amountalways @(rf_a or second_nlu or imm_8 or forwarded_op1 or forward_sh_amt or str) begin if (forward_sh_amt) shift_amount = forwarded_op1[7:0]; else if (second_nlu & !str) shift_amount = rf_a[7:0]; else shift_amount = imm_8; end/*Set the Shift Type. shift_type[1:0] 2'b00: LSL 2'b01: LSR 2'b10: ASR 2'b11: ROR shift_type[2] 1'b1: ALU Shift Reg by Imm 1'b0: All Other Shifts*/always @(ir or msr or ldm or stm or cop_mem_id or und) begin if (ldm || stm || cop_mem_id || und) shift_type = 3'h0; else if (ir[27:26] == 2'h1) shift_type = {1'b0,ir[6:5]}; else if (!ir[25] & !msr) shift_type = {~ir[4],ir[6:5]}; else shift_type = 3'h3; end//Decode the Instruction Typealways @(ir or Rd) begin case(ir[27:20]) //synopsys full_case parallel_case 8'h00: begin if (ir[11:4] == 8'h0B) inst_type = `STRH; else if (ir[7:4] == 4'h9) inst_type = `MUL; else inst_type = `ALU; end 8'h01: begin if (ir[7:4] == 4'h9) inst_type = `MUL; else if ((ir[11:4] & 8'hF9) == 8'h09) inst_type = `LDRH; else inst_type = `ALU; end 8'h02: begin if (ir[11:4] == 8'h0B) inst_type = `STRH; else if (ir[7:4] == 4'h9) inst_type = `MUL; else inst_type = `ALU; end 8'h03: begin if (ir[7:4] == 4'h9) inst_type = `MUL; else if ((ir[11:4] & 8'hF9) == 8'h09) inst_type = `LDRH; else inst_type = `ALU; end 8'h04: begin if (ir[7:4] == 4'hB) inst_type = `STRH; else inst_type = `ALU; end 8'h05: begin if ((ir[11:4] & 8'h09) == 8'h09) inst_type = `LDRH; else inst_type = `ALU; end 8'h06: begin if (ir[7:4] == 4'hB) inst_type = `STRH; else inst_type = `ALU; end 8'h07: begin if ((ir[11:4] & 8'h09) == 8'h09) inst_type = `LDRH; else inst_type = `ALU; end 8'h08: begin if (ir[11:4] == 8'h0B) inst_type = `STRH; else if (ir[7:4] == 4'h9) inst_type = `MULL; else inst_type = `ALU; end 8'h09: begin if (ir[7:4] == 4'h9) inst_type = `MULL; else if ((ir[11:4] & 8'hF9) == 8'h09) inst_type = `LDRH; else inst_type = `ALU; end 8'h0A: begin if (ir[11:4] == 8'h0B) inst_type = `STRH; else if (ir[7:4] == 4'h9) inst_type = `MULL; else inst_type = `ALU; end 8'h0B: begin if (ir[7:4] == 4'h9) inst_type = `MULL; else if ((ir[11:4] & 8'hF9) == 8'h09) inst_type = `LDRH; else inst_type = `ALU; end 8'h0C: begin if (ir[7:4] == 4'hB) inst_type = `STRH; else if (ir[7:4] == 4'h9) inst_type = `MULL; else inst_type = `ALU; end 8'h0D: begin if (ir[7:4] == 4'h9) inst_type = `MULL; else if ((ir[11:4] & 8'h09) == 8'h09) inst_type = `LDRH; else inst_type = `ALU; end 8'h0E: begin if (ir[7:4] == 4'hB) inst_type = `STRH; else if (ir[7:4] == 4'h9) inst_type = `MULL; else inst_type = `ALU; end 8'h0F: begin if (ir[7:4] == 4'h9) inst_type = `MULL; else if ((ir[11:4] & 8'h09) == 8'h09) inst_type = `LDRH; else inst_type = `ALU; end 8'h10: begin if (ir[11:4] == 8'h0B) inst_type = `STRH; else if (ir[11:4] == 8'h09) inst_type = `SWAP; else if ((ir[11:0] == 8'h00) & (ir[21:16] == 6'h0F)) inst_type = `MRS; else inst_type = `ALU; end 8'h11: begin if ((ir[11:4] & 8'hF9) == 8'h09) inst_type = `LDRH; else inst_type = `ALU; end 8'h12: begin if (ir[11:4] == 8'h0B) inst_type = `STRH; else if ((Rd == 4'hF) && (ir[18:17] == 2'b00)) inst_type = `MSR; else inst_type = `ALU; end 8'h13: begin if ((ir[11:4] & 8'hF9) == 8'h09) inst_type = `LDRH; else inst_type = `ALU; end 8'h14: begin if (ir[7:4] == 4'hB) inst_type = `STRH; else if (ir[11:4] == 8'h09) inst_type = `SWAP; else if ((ir[11:4] == 8'h00) && (ir[21:16] == 6'h0F)) inst_type = `MRS; else inst_type = `ALU; end 8'h15: begin if ((ir[11:4] & 8'h09) == 8'h09) inst_type = `LDRH; else inst_type = `ALU; end 8'h16: begin if (ir[7:4] == 4'hB) inst_type = `STRH; else if ((Rd == 4'hF) && (ir[18:17] == 2'b00)) inst_type = `MSR; else inst_type = `ALU; end 8'h17: begin if ((ir[11:4] & 8'h09) == 8'h09) inst_type = `LDRH; else inst_type = `ALU; end 8'h18: begin if (ir[11:4] == 8'h0B) inst_type = `STRH; else inst_type = `ALU; end 8'h19: begin if ((ir[11:4] & 8'hF9) == 8'h09) inst_type = `LDRH; else inst_type = `ALU; end 8'h1A: begin if (ir[11:4] == 8'h0B) inst_type = `STRH; else inst_type = `ALU; end 8'h1B: begin if ((ir[11:4] & 8'hF9) == 8'h09) inst_type = `LDRH; else inst_type = `ALU; end 8'h1C: begin if (ir[7:4] == 4'hB) inst_type = `STRH; else inst_type = `ALU; end 8'h1D: begin if ((ir[11:4] & 8'h09) == 8'h09) inst_type = `LDRH; else inst_type = `ALU; end 8'h1E: begin if (ir[7:4] == 4'hB) inst_type = `STRH; else inst_type = `ALU;?? 快捷鍵說明
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