diff options
Diffstat (limited to 'variable_delay.v')
| -rw-r--r-- | variable_delay.v | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/variable_delay.v b/variable_delay.v new file mode 100644 index 0000000..3ce30de --- /dev/null +++ b/variable_delay.v @@ -0,0 +1,77 @@ +// This module is used for creating delays +// reset will reset this module +// fast pulse will go high for one clock cycle 0.2 seconds after a reset +// slow pulse will go high for one clock cycle 0.75 seconds after a reset +// NOTE: Every time this module is reset the time before getting will also +// be reset. So if reset is constantly held high you will never get +// either pulse. +module variable_delay ( + input clk, + input reset, + input [4:0] variable_pulse_index, + output variable_pulse +); + reg [31:0] counter = 32'd0; + reg [31:0] variable_pulse_num; + + //assign variable_pulse_num = 32'd24000000 - (32'd2000000 * variable_pulse_index); + + assign variable_pulse = (counter == variable_pulse_num); + + initial begin + counter <= 32'd0; + //variable_pulse_num <= 32'd10; + variable_pulse_num <= 32'd32000000; + end + + always @ (negedge clk) begin + + if (reset) + counter <= 32'd0; + else + counter <= counter + 32'd1; + + end + + always @ (posedge clk) begin + case (variable_pulse_index) + 5'b00000: variable_pulse_num <= 32'd32000000; + 5'b00001: variable_pulse_num <= 32'd31000000; + 5'b00010: variable_pulse_num <= 32'd30000000; + 5'b00011: variable_pulse_num <= 32'd29000000; + 5'b00100: variable_pulse_num <= 32'd28000000; + 5'b00101: variable_pulse_num <= 32'd27000000; + 5'b00110: variable_pulse_num <= 32'd26000000; + 5'b00111: variable_pulse_num <= 32'd25000000; + 5'b01000: variable_pulse_num <= 32'd24000000; + 5'b01001: variable_pulse_num <= 32'd23000000; + 5'b01010: variable_pulse_num <= 32'd22000000; + 5'b01011: variable_pulse_num <= 32'd21000000; + 5'b01100: variable_pulse_num <= 32'd20000000; + 5'b01101: variable_pulse_num <= 32'd19000000; + 5'b01110: variable_pulse_num <= 32'd18000000; + 5'b01111: variable_pulse_num <= 32'd17000000; + 5'b10000: variable_pulse_num <= 32'd16000000; + 5'b10001: variable_pulse_num <= 32'd15000000; + 5'b10010: variable_pulse_num <= 32'd14000000; + 5'b10011: variable_pulse_num <= 32'd13000000; + 5'b10100: variable_pulse_num <= 32'd12000000; + 5'b10101: variable_pulse_num <= 32'd11000000; + 5'b10110: variable_pulse_num <= 32'd10000000; + 5'b10111: variable_pulse_num <= 32'd9000000; + 5'b11000: variable_pulse_num <= 32'd8000000; + 5'b11001: variable_pulse_num <= 32'd7000000; + 5'b11010: variable_pulse_num <= 32'd6000000; + 5'b11011: variable_pulse_num <= 32'd5000000; + 5'b11100: variable_pulse_num <= 32'd4000000; + 5'b11101: variable_pulse_num <= 32'd3000000; + 5'b11110: variable_pulse_num <= 32'd2000000; + 5'b11111: variable_pulse_num <= 32'd1000000; + endcase + +// if (reset) +// counter <= 32'd0; +// +// counter <= counter + 32'd1; + end +endmodule |