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`timescale 1us/1us
`include "nandgame_types.v"
module alu_tb;
logic [15:0] tst_in1;
logic [15:0] tst_in2;
logic [1:0] tst_opcode;
logic [15:0] tst_result;
logic tst_is_arith_nlogic, tst_zero_x, tst_swap_operands;
alu uut (
.X_in(tst_in1),
.Y_in(tst_in2),
.opcode_in(tst_opcode),
.result_out(tst_result),
.u_arith_nlogic_in(tst_is_arith_nlogic),
.zx_in(tst_zero_x),
.sw_in(tst_swap_operands)
);
string filename;
initial begin
`ifdef DUMP_FILE_NAME
filename=`DUMP_FILE_NAME;
`else
filename="alu.lxt2";
`endif
$dumpfile(filename); $dumpvars();
end
initial begin
tst_zero_x = 0;
tst_swap_operands = 0;
// Arith tests
tst_is_arith_nlogic = 1;
tst_in1 = 13;
tst_in2 = 17;
tst_opcode = ARITH_PLUS;
#1
assert(tst_result == 30)
else $error("Expected: 30, got: %d", tst_result);
#1
tst_in1 = 12;
tst_in2 = 4;
tst_opcode = ARITH_MINUS;
#1
assert(tst_result == 8)
else $error("Expected: 8, got: %d", tst_result);
#1
tst_in1 = 12;
tst_in2 = 13;
tst_opcode = ARITH_MINUS;
#1
assert(tst_result == 16'hffff)
else $error("Expected: 16'hffff, got: %d", tst_result);
#1
tst_in1 = 13;
tst_in2 = 17;
tst_opcode = ARITH_INC;
#1
assert(tst_result == 14)
else $error("Expected: 14, got: %d", tst_result);
#1
tst_in1 = 13;
tst_in2 = 17;
tst_opcode = ARITH_DEC;
#1
assert(tst_result == 12)
else $error("Expected: 12, got: %d", tst_result);
#1
tst_in1 = 0;
tst_in2 = 17;
tst_opcode = ARITH_DEC;
#1
assert(tst_result == 16'hffff)
else $error("Expected: 16'hffff, got: %d", tst_result);
#1
// logic tests
tst_is_arith_nlogic = 0;
tst_in1 = 16'b1010;
tst_in2 = 16'b1100;
tst_opcode = LOGIC_AND;
#1
assert(tst_result == 16'b1000)
else $error("Expected: 16'b1000, got: %d", tst_result);
#1
tst_in1 = 16'b1010;
tst_in2 = 16'b1100;
tst_opcode = LOGIC_OR;
#1
assert(tst_result == 16'b1110)
else $error("Expected: 16'b1110, got: %d", tst_result);
#1
tst_in1 = 16'b1010;
tst_in2 = 16'b1100;
tst_opcode = LOGIC_XOR;
#1
assert(tst_result == 16'b0110)
else $error("Expected: 16'b0110, got: %d", tst_result);
#1
tst_in1 = 16'b1010101010101010;
tst_opcode = LOGIC_NEGT;
#1
assert(tst_result == 16'b0101010101010101)
else $error("Expected: 16'b0101010101010101, got: %d", tst_result);
#1
// zero - tests
tst_zero_x = 1;
tst_swap_operands = 0;
// back to logic
tst_is_arith_nlogic = 0;
tst_in1 = 2;
tst_in2 = 4;
tst_opcode = LOGIC_OR;
#1
assert(tst_result == 4)
else $error("Expected 4, got %d", tst_result);
#1
// back to arith
tst_is_arith_nlogic = 1;
tst_in1 = 2;
tst_in2 = 4;
tst_opcode = ARITH_PLUS;
#1
assert(tst_result == 4)
else $error("Expected 4, got %d", tst_result);
#1
// swap tests
tst_zero_x = 0;
tst_swap_operands = 1;
tst_is_arith_nlogic = 1;
tst_in1 = 2;
tst_in2 = 3;
tst_opcode = ARITH_MINUS;
#1
// 3 - 2
assert(tst_result == 1)
else $error("Expected 1, got %d", tst_result);
// zero-swap
tst_zero_x = 1;
tst_swap_operands = 1;
tst_is_arith_nlogic = 1;
tst_in1 = 2;
tst_in2 = 3;
tst_opcode = ARITH_PLUS;
#1
// 2 + 0
assert(tst_result == 2)
else $error("Expected 2, got %d", tst_result);
$finish();
end
endmodule
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