Counters Questions

• In a 74192 BCD decade up-/down-counter, the terminal count up and the terminal count down are active-LOW.
• When implementing a complete system application using IC counter chips, output devices such as LED indicators must be configured to operate from the counter outputs.
• Generally speaking, the synchronous counter requires more circuitry than an asynchronous counter.
• In many cases, counters must be strobed in order to eliminate glitches.
• The 7447 has a 4-bit BCD input, seven individual active-LOW outputs, and a ripple blanking input and output.
• Asynchronous counters are known as modulus counters.
• Three cascaded modulus-10 counters have an overall modulus of 1000.
• A parallel in/serial out shift register enters all data bits simultaneously and transfers them out one bit at a time.
• The terminal marked A on the CTR block in the given figure is the SET terminal.
• One characteristic of a ring counter is that the modulus is equal to the number of flip-flops in the register and, consequently, there are never any unused or invalid states.
• In general, when using a scope to troubleshoot digital systems the instrument should be triggered by ________.
• ________ is the modulus of the counter shown below.
• The circuit shown below is a ________.
• The minimum number of flip-flops that can be used to construct a modulus-5 counter is ________.
• Referring to the function table given below, taking the CLEAR, S1, and S0 inputs all HIGH ________.
• A D flip-flop can be made to toggle by ________.
• The counter circuit and associated waveforms shown below are for a(n) ________ counter, and the correct output waveform for QB is shown by waveform ________.
• In VHDL, if we need to remember a value it must be stored in a ________.
• The circuit shown below is a ________.
• Modulus refers to ________.