verilog/ram_tb.v
`include "ram.v"
module ram_tb;
localparam ADDRESS_BITS = 1;
localparam DATA_BITS = 1;
reg clock, reset, write;
reg [ADDRESS_BITS-1:0] address;
reg [DATA_BITS-1:0] data;
wire [DATA_BITS-1:0] dataw;
ram top (
clock,
reset,
write,
address,
dataw
);
assign dataw = (write == 1) ? data : {DATA_BITS{1'bz}};
initial begin
$dumpfile("ram_tb.vcd");
$dumpvars;
/* Start. */
clock = 0;
reset = 0;
write = 0;
/* Reset. */
#2 reset = 1;
#2 reset = 0;
/* data[0] = 1. */
#1
address = 0;
data = 1;
#1 write = 1;
#2 write = 0;
#1 address = 0;
#1 address = 1;
/* data[1] = 1. */
#1
address = 1;
data = 1;
#1 write = 1;
#2 write = 0;
#1 address = 0;
#1 address = 1;
/* data[0] = 0. */
#1
address = 0;
data = 0;
#1 write = 1;
#2 write = 0;
#1 address = 0;
#1 address = 1;
/* data[0] = 1; data[1] = 0; */
#1
address = 0;
data = 1;
#1 write = 1;
#2
address = 1;
data = 0;
#2 write = 0;
#1 address = 0;
#1 address = 1;
#2 $finish;
end
always begin
#1 clock = ~clock;
end
endmodule