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IF.v
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`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company:
// Engineer:
//
// Create Date: 2024/07/04 17:32:15
// Design Name:
// Module Name: IF
// Project Name:
// Target Devices:
// Tool Versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////
module IF(
input [31:0]dest,lastpc,//跳转目标 输入指令 与跳转目标相对应的pc
input error,jump,hazard,clk,rst,memhazard, //错误信号 跳转与否 冒险 时钟 重置
output reg[31:0]pc, npc, instr //当前pc 下一条pc传给Imem 输出指令
);
reg [31:0]Inst_ram[31:0];
reg [31:0]buffer[31:0];
reg [1:0]state[31:0];
always@(posedge clk or posedge rst)begin
if(rst)begin
/*buffer[0]<=32'd1;
buffer[1]<=32'd2;
buffer[2]<=32'd3;
buffer[3]<=32'd4;
buffer[4]<=32'd5;
buffer[5]<=32'd6;
buffer[6]<=32'd7;
buffer[7]<=32'd8;
buffer[8]<=32'd9;
buffer[9]<=32'd10;
buffer[10]<=32'd11;
buffer[11]<=32'd12;
buffer[12]<=32'd13;
buffer[13]<=32'd14;
buffer[14]<=32'd15;
buffer[15]<=32'd16;
buffer[16]<=32'd17;
buffer[17]<=32'd18;
buffer[18]<=32'd19;
buffer[19]<=32'd20;
buffer[20]<=32'd21;
buffer[21]<=32'd22;
Inst_ram[0]<=32'h01006093;
Inst_ram[1]<=32'h00209093;
Inst_ram[2]<=32'h0100e093;
Inst_ram[3]<=32'h01006113;
Inst_ram[4]<=32'h00211113;
Inst_ram[5]<=32'h00116113;
Inst_ram[6]<=32'h00006193;
Inst_ram[7]<=32'h001101b3;
Inst_ram[8]<=32'h00006193;
Inst_ram[9]<=32'h403081b3;
Inst_ram[10]<=32'h402181b3;
Inst_ram[11]<=32'h00218193;
Inst_ram[12]<=32'h00006193;
Inst_ram[13]<=32'h40018193;
Inst_ram[14]<=32'h00109093;
Inst_ram[15]<=32'h001101b3;
Inst_ram[16]<=32'h0ff06093;
Inst_ram[17]<=32'h01009093;
Inst_ram[18]<=32'h0000a133;
Inst_ram[19]<=32'h0000b133;
Inst_ram[20]<=32'h4000a113;
Inst_ram[21]<=32'h4000a113;*/
/*buffer[0]<=32'd1;
buffer[1]<=32'd2;
buffer[2]<=32'd3;
buffer[3]<=32'd4;
buffer[4]<=32'd5;
buffer[5]<=32'd6;
buffer[6]<=32'd7;
buffer[7]<=32'd8;
buffer[8]<=32'd9;
buffer[9]<=32'd10;
buffer[10]<=32'd11;
Inst_ram[0]<=32'h00000293;
Inst_ram[1]<=32'h00000313;
Inst_ram[2]<=32'h00000393;
Inst_ram[3]<=32'h00a00e13;
Inst_ram[4]<=32'h00138393;
Inst_ram[5]<=32'h00530333;
Inst_ram[6]<=32'h00128293;
Inst_ram[7]<=32'hffc29ce3;
Inst_ram[8]<=32'h00000293;
Inst_ram[9]<=32'hffc396e3;
Inst_ram[10]<=32'h00130313;*/
/*buffer[0]<=32'd1;
buffer[1]<=32'd2;
buffer[2]<=32'd3;
buffer[3]<=32'd4;
buffer[4]<=32'd5;
buffer[5]<=32'd6;
buffer[6]<=32'd7;
Inst_ram[0]<=32'h00000293;
Inst_ram[1]<=32'h00000313;
Inst_ram[2]<=32'h06500393;
Inst_ram[3]<=32'h00530333;
Inst_ram[4]<=32'h00128293;
Inst_ram[5]<=32'hfe729ce3;
Inst_ram[6]<=32'h00130313;*/
/*buffer[0]<=32'd1;
buffer[1]<=32'd2;
buffer[2]<=32'd3;
buffer[3]<=32'd4;
buffer[4]<=32'd5;
buffer[5]<=32'd6;
buffer[6]<=32'd7;
buffer[7]<=32'd8;
Inst_ram[0]<=32'h001010b7;
Inst_ram[1]<=32'h1010e093;
Inst_ram[2]<=32'h1000e113;
Inst_ram[3]<=32'h0020e0b3;
Inst_ram[4]<=32'h0fe0f193;
Inst_ram[5]<=32'h0011f0b3;
Inst_ram[6]<=32'h3000c213;
Inst_ram[7]<=32'h001240b3;*/
/*buffer[0]<=32'd1;//ld ans store
buffer[1]<=32'd2;
buffer[2]<=32'd3;
buffer[3]<=32'd4;
buffer[4]<=32'd5;
buffer[5]<=32'd6;
buffer[6]<=32'd7;
buffer[7]<=32'd8;
buffer[8]<=32'd9;
buffer[9]<=32'd10;
buffer[10]<=32'd11;
buffer[11]<=32'd12;
buffer[12]<=32'd13;
buffer[13]<=32'd14;
buffer[14]<=32'd15;
buffer[15]<=32'd16;
buffer[16]<=32'd17;
buffer[17]<=32'd18;
buffer[18]<=32'd19;
buffer[19]<=32'd20;
buffer[20]<=32'd21;
buffer[21]<=32'd22;
buffer[22]<=32'd23;
buffer[23]<=32'd24;
Inst_ram[0]<=32'h0ff06193;
Inst_ram[1]<=32'h003021a3;
Inst_ram[2]<=32'h0081d193;
Inst_ram[3]<=32'h00302123;
Inst_ram[4]<=32'h0dd06193;
Inst_ram[5]<=32'h003020a3;
Inst_ram[6]<=32'h0081d193;
Inst_ram[7]<=32'h00302023;
Inst_ram[8]<=32'h00300083;
Inst_ram[9]<=32'h00204083;
Inst_ram[10]<=32'h00000013;
Inst_ram[11]<=32'h0bb06193;
Inst_ram[12]<=32'h00302223;
Inst_ram[13]<=32'h00405083;
Inst_ram[14]<=32'h00401083;
Inst_ram[15]<=32'h09906193;
Inst_ram[16]<=32'h00302323;
Inst_ram[17]<=32'h00601083;
Inst_ram[18]<=32'h00605083;
Inst_ram[19]<=32'h04506193;
Inst_ram[20]<=32'h01019193;
Inst_ram[21]<=32'h0671e193;
Inst_ram[22]<=32'h00302423;
Inst_ram[23]<=32'h00802083;*/
/*buffer[0]<=32'd1;
buffer[1]<=32'd2;
buffer[2]<=32'd3;
buffer[3]<=32'd4;
buffer[4]<=32'd5;
buffer[5]<=32'd6;
buffer[6]<=32'd7;
buffer[7]<=32'd8;
buffer[8]<=32'd9;
buffer[9]<=32'd10;
buffer[10]<=32'd11;
buffer[11]<=32'd12;
Inst_ram[0]<=32'h00404137;
Inst_ram[1]<=32'h40416113;
Inst_ram[2]<=32'h00706393;
Inst_ram[3]<=32'h00506293;
Inst_ram[4]<=32'h00806413;
Inst_ram[5]<=32'h00811113;
Inst_ram[6]<=32'h00711133;
Inst_ram[7]<=32'h00815113;
Inst_ram[8]<=32'h00515133;
Inst_ram[9]<=32'h01311113;
Inst_ram[10]<=32'h41015113;
Inst_ram[11]<=32'h40815133;*/
/*buffer[0]<=32'd1;//test1
buffer[1]<=32'd2;
buffer[2]<=32'd3;
buffer[3]<=32'd4;
buffer[4]<=32'd5;
buffer[5]<=32'd6;
buffer[6]<=32'd7;
buffer[7]<=32'd8;
buffer[8]<=32'd9;
buffer[9]<=32'd10;
buffer[10]<=32'd11;
buffer[11]<=32'd12;
buffer[12]<=32'd13;
buffer[13]<=32'd14;
buffer[14]<=32'd15;
buffer[15]<=32'd16;
buffer[16]<=32'd17;
buffer[17]<=32'd18;
buffer[18]<=32'd19;
buffer[19]<=32'd20;
buffer[20]<=32'd21;
buffer[21]<=32'd22;
buffer[22]<=32'd23;
buffer[23]<=32'd24;
buffer[24]<=32'd25;
buffer[25]<=32'd26;
buffer[26]<=32'd27;
buffer[27]<=32'd28;
buffer[28]<=32'd29;
buffer[29]<=32'd30;
buffer[30]<=32'd31;
buffer[31]<=32'd32;
buffer[32]<=32'd33;
buffer[33]<=32'd34;
buffer[34]<=32'd35;
buffer[35]<=32'd36;
buffer[36]<=32'd37;
buffer[37]<=32'd38;
buffer[38]<=32'd39;
buffer[39]<=32'd40;
buffer[40]<=32'd41;
buffer[41]<=32'd42;
buffer[42]<=32'd43;
buffer[43]<=32'd44;
buffer[44]<=32'd45;
buffer[45]<=32'd46;
buffer[46]<=32'd47;
buffer[47]<=32'd48;
buffer[48]<=32'd49;
buffer[49]<=32'd50;
buffer[50]<=32'd51;
buffer[51]<=32'd52;
buffer[52]<=32'd53;
buffer[53]<=32'd54;
buffer[54]<=32'd55;
buffer[55]<=32'd56;
buffer[56]<=32'd57;
buffer[57]<=32'd58;
buffer[58]<=32'd59;
buffer[59]<=32'd60;
buffer[60]<=32'd61;
buffer[61]<=32'd62;
Inst_ram[0]<=32'h10004693;
Inst_ram[1]<=32'h00001137;
Inst_ram[2]<=32'h00004533;
Inst_ram[3]<=32'h000045b3;
Inst_ram[4]<=32'hfff68613;
Inst_ram[5]<=32'h00261613;
Inst_ram[6]<=32'h008000ef;
Inst_ram[7]<=32'h0000006f;
Inst_ram[8]<=32'h0cc5da63;
Inst_ram[9]<=32'h0005e333;
Inst_ram[10]<=32'h000663b3;
Inst_ram[11]<=32'h006502b3;
Inst_ram[12]<=32'h0002a283;
Inst_ram[13]<=32'h04735263;
Inst_ram[14]<=32'h00750e33;
Inst_ram[15]<=32'h000e2e03;
Inst_ram[16]<=32'h005e4663;
Inst_ram[17]<=32'hffc38393;
Inst_ram[18]<=32'hfedff06f;
Inst_ram[19]<=32'h00650eb3;
Inst_ram[20]<=32'h01cea023;
Inst_ram[21]<=32'h02735263;
Inst_ram[22]<=32'h00650e33;
Inst_ram[23]<=32'h000e2e03;
Inst_ram[24]<=32'h01c2c663;
Inst_ram[25]<=32'h00430313;
Inst_ram[26]<=32'hfedff06f;
Inst_ram[27]<=32'h00750eb3;
Inst_ram[28]<=32'h01cea023;
Inst_ram[29]<=32'hfc7340e3;
Inst_ram[30]<=32'h00650eb3;
Inst_ram[31]<=32'h005ea023;
Inst_ram[32]<=32'hffc10113;
Inst_ram[33]<=32'h00112023;
Inst_ram[34]<=32'hffc10113;
Inst_ram[35]<=32'h00b12023;
Inst_ram[36]<=32'hffc10113;
Inst_ram[37]<=32'h00c12023;
Inst_ram[38]<=32'hffc10113;
Inst_ram[39]<=32'h00612023;
Inst_ram[40]<=32'hffc30613;
Inst_ram[41]<=32'hf7dff0ef;
Inst_ram[42]<=32'h00012303;
Inst_ram[43]<=32'h00410113;
Inst_ram[44]<=32'h00012603;
Inst_ram[45]<=32'h00410113;
Inst_ram[46]<=32'h00012583;
Inst_ram[47]<=32'hffc10113;
Inst_ram[48]<=32'h00c12023;
Inst_ram[49]<=32'hffc10113;
Inst_ram[50]<=32'h00612023;
Inst_ram[51]<=32'h00430593;
Inst_ram[52]<=32'hf51ff0ef;
Inst_ram[53]<=32'h00012303;
Inst_ram[54]<=32'h00410113;
Inst_ram[55]<=32'h00012603;
Inst_ram[56]<=32'h00410113;
Inst_ram[57]<=32'h00012583;
Inst_ram[58]<=32'h00410113;
Inst_ram[59]<=32'h00012083;
Inst_ram[60]<=32'h00410113;
Inst_ram[61]<=32'h00008067;*/
/*buffer[0]<=32'd1;//test2
buffer[1]<=32'd2;
buffer[2]<=32'd3;
buffer[3]<=32'd4;
buffer[4]<=32'd5;
buffer[5]<=32'd6;
buffer[6]<=32'd7;
buffer[7]<=32'd8;
buffer[8]<=32'd9;
buffer[9]<=32'd10;
buffer[10]<=32'd11;
buffer[11]<=32'd12;
buffer[12]<=32'd13;
buffer[13]<=32'd14;
buffer[14]<=32'd15;
buffer[15]<=32'd16;
buffer[16]<=32'd17;
buffer[17]<=32'd18;
buffer[18]<=32'd19;
buffer[19]<=32'd20;
buffer[20]<=32'd21;
buffer[21]<=32'd22;
buffer[22]<=32'd23;
buffer[23]<=32'd24;
buffer[24]<=32'd25;
buffer[25]<=32'd26;
buffer[26]<=32'd27;
buffer[27]<=32'd28;
buffer[28]<=32'd29;
buffer[29]<=32'd30;
buffer[30]<=32'd31;
Inst_ram[0]<=32'h00404713;
Inst_ram[1]<=32'h00404693;
Inst_ram[2]<=32'h00e696b3;
Inst_ram[3]<=32'h00004633;
Inst_ram[4]<=32'h00e69533;
Inst_ram[5]<=32'h00a505b3;
Inst_ram[6]<=32'h000042b3;
Inst_ram[7]<=32'h00004333;
Inst_ram[8]<=32'h00004e33;
Inst_ram[9]<=32'h000043b3;
Inst_ram[10]<=32'h00e29eb3;
Inst_ram[11]<=32'h007e8eb3;
Inst_ram[12]<=32'h00ae8eb3;
Inst_ram[13]<=32'h000eae83;
Inst_ram[14]<=32'h00e39f33;
Inst_ram[15]<=32'h006f0f33;
Inst_ram[16]<=32'h00bf0f33;
Inst_ram[17]<=32'h000f2f03;
Inst_ram[18]<=32'h01eefeb3;
Inst_ram[19]<=32'h01de0e33;
Inst_ram[20]<=32'h00438393;
Inst_ram[21]<=32'hfcd3cae3;
Inst_ram[22]<=32'h00e29eb3;
Inst_ram[23]<=32'h006e8eb3;
Inst_ram[24]<=32'h00ce8eb3;
Inst_ram[25]<=32'h01cea023;
Inst_ram[26]<=32'h00430313;
Inst_ram[27]<=32'hfad34ae3;
Inst_ram[28]<=32'h00428293;
Inst_ram[29]<=32'hfad2c4e3;
Inst_ram[30]<=32'h0000006f;*/
buffer[0]<=32'd1;
buffer[1]<=32'd2;
buffer[2]<=32'd3;
buffer[3]<=32'd4;
buffer[4]<=32'd5;
buffer[5]<=32'd6;
buffer[6]<=32'd7;
buffer[7]<=32'd8;
buffer[8]<=32'd9;
buffer[9]<=32'd10;
buffer[10]<=32'd11;
buffer[11]<=32'd12;
buffer[12]<=32'd13;
buffer[13]<=32'd14;
buffer[14]<=32'd15;
buffer[15]<=32'd16;
buffer[16]<=32'd17;
buffer[17]<=32'd18;
Inst_ram[0]<=32'b00000000000000000000100110110011;
Inst_ram[1]<=32'b00000010000000000000100110010011;
Inst_ram[2]<=32'b00000000000010011010100100000011;
Inst_ram[3]<=32'b00000001001010010000100100110011;
Inst_ram[4]<=32'b00000001111010010000100100010011;
Inst_ram[5]<=32'b00000010000000000010101000000011;
Inst_ram[6]<=32'b00000000000010010000101000110011;
Inst_ram[7]<=32'b00000001010010100010000100100011;
Inst_ram[8]<=32'b00000010000000000010101010000011;
Inst_ram[9]<=32'b00000001010010101000101010110011;
Inst_ram[10]<=32'b00011110010010101000101010010011;
Inst_ram[11]<=32'b00001110000110010000100100010011;
Inst_ram[12]<=32'b00000001001010101010000000100011;
Inst_ram[13]<=32'b00000000000010101000101000000011;
Inst_ram[14]<=32'b00000000000010100000101000110011;
Inst_ram[15]<=32'b00000010000000000010101000000011;
Inst_ram[16]<=32'b00000010000000000010101000000011;
Inst_ram[17]<=32'b00000000000010101010101010000011;
// 09b30000
pc<=32'b0;
npc<=32'b0;
instr<=32'bx;
end
else if(memhazard==1'b1)begin
pc<=pc;
npc<=npc;
instr<=instr;
end
else begin
if(error==1'b1)begin//因为我们的一旦error那么即使有Hazard也会被刷掉，优先级error>hazard
pc<=dest;
npc<=buffer[dest]; //更新正确的pc的同时也要更新预测的目标地址
instr<=Inst_ram[dest];
if(jump==1'b1)begin//实际跳转了，预测没跳转
if(state[lastpc]==2'b01)begin
state[lastpc]<=2'b10;
buffer[lastpc]<=dest;
end
else begin
state[lastpc]<=2'b01;
end
end
else begin //实际顺序执行，预测跳转
if(state[lastpc]==2'b10)begin
state[lastpc]<=2'b01;
buffer[lastpc]<=dest;
end
else begin
state[lastpc]<=2'b10;
end
end
end
else begin
if(hazard==1'b1)begin
pc<=pc;
npc<=npc;
instr<=instr;
end
else begin
pc<=npc;
npc<=buffer[npc];
instr<=Inst_ram[npc];
end
//预测成功仍然需要对状态机进行更新 变成强跳转 或者 强不跳转
if(jump==1'b1)begin
if(state[lastpc]==2'b10)state[lastpc]<=2'b11;
end
else if(jump==1'b0)begin
if(state[lastpc]==2'b01)state[lastpc]<=2'b00;
end
end
end
end
endmodule