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/*
* (c) https://www.fpga4fun.com
*
* ported to iceFun FPGA by Hirosh Dabui <hirosh@dabui.de>
*/
module top (
input clk12MHz,
output spkp,
output spkm
);
wire clk;
assign spkp = speaker;
assign spkm = ~speaker;
// 25 MHz PLL
SB_PLL40_CORE #(
.FEEDBACK_PATH("SIMPLE"),
.DIVR(4'b0000), // DIVR = 0
.DIVF(7'b1000010), // DIVF = 66
.DIVQ(3'b101), // DIVQ = 5
.FILTER_RANGE(3'b001) // FILTER_RANGE = 1
) uut (
.LOCK(locked),
.RESETB(1'b1),
.BYPASS(1'b0),
.REFERENCECLK(clk12MHz),
.PLLOUTCORE(clk)
);
reg [15:0] counter;
always @(posedge clk) counter <= counter+1;
// and use the most significant bit (MSB) of the counter to drive the speaker
assign speaker = counter[15];
endmodule
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