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consolidate encoding types

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This commit is contained in:
Arthur Lu 2022-08-20 12:50:06 -07:00
parent 8e6962ad4d
commit 770f6eb8cc
2 changed files with 35 additions and 42 deletions
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71
RTL/Ctrl.sv
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@ -25,14 +25,10 @@ module Ctrl #(
logic [7:0] I_Immediate;
logic [7:0] T_Immediate;
logic [3:0] A_operand;
logic [3:0] S_operand;
logic [3:0] G_operand;
assign I_Immediate = Instruction[7:0];
assign T_Immediate = Instruction[2:0];
assign A_operand = Instruction[3:0];
assign S_operand = {1'b1, Instruction[2:0]};
assign G_operand = {1'b0, Instruction[2:0]};
always_comb begin
// default values for an invalid NOP instruction, proper NOP instruction encoded as a LSH by 0
@ -49,90 +45,87 @@ module Ctrl #(
BranchNZ = 'b0;
BranchAlways = 'b0;
write_mem = 'b0;
casez(Instruction[8:4])
'b1_????: begin // LDI
ALU_A = I_Immediate;
end
'b0_0000: begin // PUT
if(Instruction[8]) begin
ALU_A = I_Immediate;
end
else case(Instruction[7:4])
'b0000: begin // PUT
Waddr = A_operand;
end
'b0_0001: begin // GET
'b0001: begin // GET
RaddrA = A_operand;
end
'b0_0010: begin // LDW
RaddrA = S_operand;
'b0010: begin // LDW
RaddrA = A_operand;
RegInput = mem_out;
end
'b0_0011: begin // STW
RaddrA = S_operand;
'b0011: begin // STW
RaddrA = A_operand;
RegWrite = 'b0;
write_mem = 'b1;
end
'b0_0100: begin // NXT
if(S_operand == 'd8 || S_operand == 'd9 || S_operand == 'd10) begin
'b0100: begin // NXT
if(A_operand == 'd8 || A_operand == 'd9 || A_operand == 'd10) begin
ALU_OP = SUB;
ALU_B = 'b1;
end
else if (S_operand == 'd11 || S_operand == 'd12 || S_operand == 'd13) begin
else if (A_operand == 'd11 || A_operand == 'd12 || A_operand == 'd13) begin
ALU_OP = ADD;
ALU_B = 'b1;
end
else ALU_OP = NOP;
RaddrA = S_operand;
Waddr = S_operand;
RaddrA = A_operand;
Waddr = A_operand;
end
'b0_0101: begin //CLB
'b0101: begin //CLB
ALU_OP = CLB;
RaddrA = G_operand;
Waddr = G_operand;
RaddrA = A_operand;
Waddr = A_operand;
end
'b0_0110: begin // ADD
'b0110: begin // ADD
ALU_OP = ADD;
RaddrA = A_operand;
end
'b0_0111: begin // AND
'b0111: begin // AND
ALU_OP = AND;
RaddrA = A_operand;
end
'b0_1000: begin // LSH
'b1000: begin // LSH
ALU_OP = LSH;
ALU_A = T_Immediate;
end
'b0_1001: begin // RXR
'b1001: begin // RXR
ALU_OP = RXOR;
RaddrA = A_operand;
end
'b0_1010: begin // XOR
'b1010: begin // XOR
ALU_OP = XOR;
RaddrA = A_operand;
end
'b0_1011: begin // DNE
'b1011: begin // DNE
Done_in = 'b1;
end
'b0_1100: begin // JNZ
'b1100: begin // JNZ
RegWrite = 'b0;
RaddrA = G_operand;
RaddrA = A_operand;
BranchNZ = 'b1;
end
'b0_1101: begin // JEZ
'b1101: begin // JEZ
RegWrite = 'b0;
RaddrA = G_operand;
RaddrA = A_operand;
BranchEZ = 'b1;
end
'b0_1110: begin // JMP
'b1110: begin // JMP
RegWrite = 'b0;
RaddrA = G_operand;
RaddrA = A_operand;
BranchAlways = 'b1;
end
'b0_1111: begin // JAL
RaddrA = G_operand;
'b1111: begin // JAL
RaddrA = A_operand;
Waddr = 'd14; // write to link register specifically
RegInput = ProgCtr_p1[7:0]; // write the value pc+4
BranchAlways = 'b1;
end
default: begin
RegWrite = 'b0;
end
endcase
end

6
firmware/assembler.py
View File

@ -49,9 +49,9 @@ op_codes = {
'LDI': 0b1_0000_0000,
'PUT': 0b0_0000_0000,
'GET': 0b0_0001_0000,
'LDW': 0b0_0010_0000,
'STW': 0b0_0011_0000,
'NXT': 0b0_0100_0000,
'LDW': 0b0_0010_1000,
'STW': 0b0_0011_1000,
'NXT': 0b0_0100_1000,
'CLB': 0b0_0101_0000,
'ADD': 0b0_0110_0000,
'AND': 0b0_0111_0000,