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The simplest way to do something like that is with a counter. Something like this maybe?
localparam MAX_COUNT = 8'b1110;
reg out;
reg counter;
always @ (posedge clock) begin
if (trigger) begin
counter <= 8'b0;
out <= 1'b1; //out is set on trigger
end else if (counter != MAX_COUNT) begin
counter <= counter + 8'b1;
end else begin
out <= 1'b0; // out is cleared after count
end
end
Obviously you could change the size of the counter, the polarity of the out signal, and the MAX_COUNT (which could even be another register if you want to change it during run time).
The counter is essentially acting as the capacitor in this case, counting up (charging), until some threshold after which the output clears.
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Awesome thanks! I will definitely try out this design. I have been looking for a method that doesn't require a clock, but I think this might work. It just limits the "values" of the "capacitance" to# clock cycles, meaning it can't have a of 1.32124 clock cycles as the "charge time".
Thoughts?
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