diff options
Diffstat (limited to 'part_4/ex16/pwm.v')
| -rw-r--r-- | part_4/ex16/pwm.v | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/part_4/ex16/pwm.v b/part_4/ex16/pwm.v new file mode 100644 index 0000000..c3b34d9 --- /dev/null +++ b/part_4/ex16/pwm.v @@ -0,0 +1,25 @@ +module pwm (clk, data_in, load, pwm_out);
+
+ input clk; // system clock
+ input [9:0] data_in; // input data for conversion
+ input load; // high pulse to load new data
+ output pwm_out; // PWM output
+
+ reg [9:0] d; // internal register
+ reg [9:0] count; // internal 10-bit counter
+ reg pwm_out;
+
+ always @ (posedge clk)
+ if (load == 1'b1) d <= data_in;
+
+ initial count = 10'b0;
+
+ always @ (posedge clk) begin
+ count <= count + 1'b1;
+ if (count > d)
+ pwm_out <= 1'b0;
+ else
+ pwm_out <= 1'b1;
+ end
+
+endmodule
|