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`timescale 1us/1us
`include "nandgame_types.v"
module alu_tb;
logic [15:0] in1;
logic [15:0] in2;
logic [1:0] opcode;
logic [15:0] result;
logic u, zx, sw;
alu uut (
.X(in1),
.Y(in2),
.opcode(opcode),
.RES(result),
.u(u),
.zx(zx),
.sw(sw)
);
string filename;
initial begin
`ifdef DUMP_FILE_NAME
filename=`DUMP_FILE_NAME;
`else
filename="alu.lxt2";
`endif
$dumpfile(filename); $dumpvars();
end
initial begin
zx = 0;
sw = 0;
// Arith tests
u = 1;
in1 = 13;
in2 = 17;
opcode = ARITH_PLUS;
#1
assert(result == 30)
else $error("Expected: 30, got: %d", result);
#1
in1 = 12;
in2 = 4;
opcode = ARITH_MINUS;
#1
assert(result == 8)
else $error("Expected: 8, got: %d", result);
#1
in1 = 12;
in2 = 13;
opcode = ARITH_MINUS;
#1
assert(result == 16'hffff)
else $error("Expected: 16'hffff, got: %d", result);
#1
in1 = 13;
in2 = 17;
opcode = ARITH_INC;
#1
assert(result == 14)
else $error("Expected: 14, got: %d", result);
#1
in1 = 13;
in2 = 17;
opcode = ARITH_DEC;
#1
assert(result == 12)
else $error("Expected: 12, got: %d", result);
#1
in1 = 0;
in2 = 17;
opcode = ARITH_DEC;
#1
assert(result == 16'hffff)
else $error("Expected: 16'hffff, got: %d", result);
#1
// logic tests
u = 0;
in1 = 16'b1010;
in2 = 16'b1100;
opcode = LOGIC_AND;
#1
assert(result == 16'b1000)
else $error("Expected: 16'b1000, got: %d", result);
#1
in1 = 16'b1010;
in2 = 16'b1100;
opcode = LOGIC_OR;
#1
assert(result == 16'b1110)
else $error("Expected: 16'b1110, got: %d", result);
#1
in1 = 16'b1010;
in2 = 16'b1100;
opcode = LOGIC_XOR;
#1
assert(result == 16'b0110)
else $error("Expected: 16'b0110, got: %d", result);
#1
in1 = 16'b1010101010101010;
opcode = LOGIC_NEGT;
#1
assert(result == 16'b0101010101010101)
else $error("Expected: 16'b0101010101010101, got: %d", result);
#1
// zero - tests
zx = 1;
sw = 0;
// back to logic
u = 0;
in1 = 2;
in2 = 4;
opcode = LOGIC_OR;
#1
assert(result == 4)
else $error("Expected 4, got %d", result);
#1
// back to arith
u = 1;
in1 = 2;
in2 = 4;
opcode = ARITH_PLUS;
#1
assert(result == 4)
else $error("Expected 4, got %d", result);
#1
// swap tests
zx = 0;
sw = 1;
u = 1;
in1 = 2;
in2 = 3;
opcode = ARITH_MINUS;
#1
// 3 - 2
assert(result == 1)
else $error("Expected 1, got %d", result);
// zero-swap
zx = 1;
sw = 1;
u = 1;
in1 = 2;
in2 = 3;
opcode = ARITH_PLUS;
#1
// 2 + 0
assert(result == 2)
else $error("Expected 2, got %d", result);
$finish();
end
endmodule
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