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code debug

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Imants Pulkstenis
2020-02-16 15:28:19 +02:00
parent 4b4e427c4a
commit 23c36a292b
1 changed files with 19 additions and 19 deletions
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ps2/ps02q/alu.v
+19 -19
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@@ -45,76 +45,76 @@ always@(posedge clk) begin
4'h0: begin
reg_R <= A - B;
if ( B > A ) begin
reg_flag = 'b1;
reg_flag <= 'b1;
end
else reg_flag = 'b0;
else reg_flag <= 'b0;
end
4'h1: begin
reg_R <= A + B;
if ((A + B) > reg_max_pos ) begin
reg_flag = 'b1;
reg_flag <= 'b1;
end
else reg_flag = 'b0;
else reg_flag <= 'b0;
end
4'h2: begin
reg_R <= ~(A & B);
reg_flag = 'b0;
reg_flag <= 'b0;
end
4'h3: begin
reg_R <= A & B;
reg_flag = 'b0;
reg_flag <= 'b0;
end
4'h4: begin
reg_R <= A | B;
reg_flag = 'b0;
reg_flag <= 'b0;
end
4'h5: begin
reg_R <= ~(A | B);
reg_flag = 'b0;
reg_flag <= 'b0;
end
4'h6: begin
reg_R <= A ^ B;
reg_flag = 'b0;
reg_flag <= 'b0;
end
4'h7: begin
reg_R <= ~A;
reg_flag = 'b0;
reg_flag <= 'b0;
end
4'h8: begin
reg_R <= ~B;
reg_flag = 'b0;
reg_flag <= 'b0;
end
4'h9: begin
reg_R <= B + 1;
if ( B == reg_max_pos ) reg_flag = 'b1;
if ( B == reg_max_pos ) reg_flag <= 'b1;
end
4'ha: begin
reg_R <= A + 1;
if ( reg_max_pos ) reg_flag = 'b1;
if ( reg_max_pos ) reg_flag <= 'b1;
end
4'hb: begin
reg_R <= A - 1;
if ( A == {1'b1, ~reg_max_pos } ) reg_flag = 'b1;
if ( A == {1'b1, ~reg_max_pos } ) reg_flag <= 'b1;
end
4'hc: begin
reg_R <= B - 1;
if ( B == {1'b1, ~reg_max_pos } ) reg_flag = 'b1;
if ( B == {1'b1, ~reg_max_pos } ) reg_flag <= 'b1;
end
4'hd: begin
reg_R <= A << 1; // << Shift Left, Logical (fill with zero)
reg_flag = 'b0; // <<< Shift Left, Arithmetic (keep sign)
reg_flag <= 'b0; // <<< Shift Left, Arithmetic (keep sign)
end
4'he: begin
reg_R <= A >> 1; // >> Shift Right, Logical (fill with zero)
reg_flag = 'b0; // >>> Shift Right, Arithmetic (keep sign)
reg_flag <= 'b0; // >>> Shift Right, Arithmetic (keep sign)
end
4'hf: begin
reg_R <= 'b0;
reg_flag = 'b0;
reg_flag <= 'b0;
end
default: begin
reg_R <= 'b0;
reg_flag = 'b0;
reg_flag <= 'b0;
end
endcase
end