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Published on Jun 18, 2012
Use of synchronous counters with asynchronous transfer, generation of pulse group Generation of incoming pulse group (burst) with preset impulse quantity is a common task. Such generation is required, for instance, when exchanging information in serial code. The task is solved using synchronous counters with asynchronous transfer. If a 8-bit shift register is used to transform a parallel code into a series one, then it needs a pulse burst (8 pulses) as a sync signal. Let's look at such generator scheme. One trigger is used to synchronize. It's transferred by positive front of "Start" signal. The second trigger is transferred by one positive front of such generator signal. The second trigger allows generator pulses to go to the output through 2I-NE element, as well as allows IE7 counter operation. As a result, Output 1 generates pulse burst, the pulses quantity is monitored by means of IE7 counter. After 8 negative pulses go to the Circuit Output 1, the counter's output 8 generates unity, it resets both triggers to the initial zero condition (by means of a negative pulse of 2I-NE element output), and bans pulse run to the output. 8 pulse burst is generated. The generator becomes active after the next "Start" signal.