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alu bugfix

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This commit is contained in:
Erick
2022-03-07 02:16:33 +01:00
parent 58431ec27f
commit e8be158685
2 changed files with 13 additions and 13 deletions
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cpu/alu/adder16.sv
+1 -1
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@@ -9,7 +9,7 @@ package adder16 (
wire [15:0]c wire [15:0]c
); );
lookahead(c, a, b); c = lookahead(c, a, b);
adder(sum16[0], carry16[0] = c[0], a16[0], b16[0],); adder(sum16[0], carry16[0] = c[0], a16[0], b16[0],);
adder(sum16[1], carry16[1] = c[1], a16[1], b16[1]); adder(sum16[1], carry16[1] = c[1], a16[1], b16[1]);
cpu/alu/alu.sv
+5 -5
View File
@@ -19,7 +19,7 @@ assign nb = sel[3]; // if nx=1, b=!b
assign f = sel[4]; // if f=0 -> a&b; else -> a+b assign f = sel[4]; // if f=0 -> a&b; else -> a+b
assign no = sel[5]; // if no=1, out=!out assign no = sel[5]; // if no=1, out=!out
wire [15:0]zero16 = 0; wire [15:0] zero16 = 15'b0000000000000000;
always @(*) begin always @(*) begin
@@ -47,10 +47,10 @@ always @(*) begin
alu_out = tmpOut; alu_out = tmpOut;
end end
if (alu_out == 0) if (alu_out < 0)
flag = 0; // zero flag flag = 0; // negative flag
else if (alu_out < 0) else if (alu_out = 0)
flag = 1; // negative flag flag = 1; // zero flag
else if else if
flag = 2 // positive flag flag = 2 // positive flag
end end