shaping aynchronous signal

I have to build a block acting like a monostable with programmable duration: ____________ | | ________ In: _|___ -->| |----> Out: _| |____ | | Clk: --|> | duration ------------- / \ | | duration

Which solutions is better:

a) Connect In to asyncronous preset and to D input ports of a flip-flop that starts a counter, when counter reachs end it resets this flip flop;

_____________ In ----|Pre Clr|__________________________ | | | ________________ | --|D | | Counter |---- End count | Q|------ | | | |---^----------- Clk ----> | | | | | | | -------------- | ---------------------------

b) Connect In to the CLOCK input of a flip flop with its D input wired to Vcc;

______________ ___ | Clr|__________________________ | | | ________________ | -----|D | | Counter |---- End count | Q|------ | | | |---^----------- In ----> | | | | | -------------- | Clk ---------------------------

Thank you in advance

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antonio bergnoli
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