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Since serial is asynchronous, the port is able to transmit data on one line while receiving data on another.
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Communication is completed using 3 transmission lines: Typically, serial is used to transmit ASCII data. This is slower than parallel communication, which allows the transmission of an entire byte at once however, it is simpler and can be used over longer distances.įor example, the IEEE 488 specifications for parallel communication state that the cabling between equipment can be no more than 20 meters total, with no more than 2 meters between any two devices serial can extend as much as 1200 meters. The serial port sends and receives bytes of information one bit at a time. The concept of serial communication is simple. Serial Communication Interview QuestionsĬontrol System Engineer Interview Questions What is Serial communication? Go ahead with this article and get your basics back. That means, the present outputs of second and third D flip-flops are equal to the previous outputs of first and second D flip-flops.We prepared a list of Serial Communication Interview Questions for your interview preparation. The previous outputs of first and second D flip-flops are right shifted by one bit. So, the present output of first D flip-flop is equal to the previous complemented output of third flip-flop. Serial input of first D flip-flop gets the previous complemented output of third flip-flop. Therefore, the following operations take place for every positive edge of clock signal. This status repeats for every six positive edge transitions of clock signal. The output of rightmost D flip-flop is connected to serial input of left most D flip-flop.Īssume, initial status of the D flip-flops from leftmost to rightmost is $Q_=000$. The 3-bit Ring counter contains only a 3-bit SIPO shift register. The block diagram of 3-bit Ring counter is shown in the following figure. Therefore, Ring counter produces a sequence of states (pattern of zeros and ones) and it repeats for every ‘N’ clock cycles. But, the only difference is that the output of rightmost D flip-flop is given as input of leftmost D flip-flop instead of applying data from outside. Similarly, ‘N’ bit Ring counter performs the similar operation.
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It accepts the data from outside in serial form and it requires ‘N’ clock pulses in order to shift ‘N’ bit data. In previous chapter, we discussed the operation of Serial In - Parallel Out (SIPO) shift register. In this chapter, let us discuss about these two counters one by one. Those are Ring counter and Johnson Ring counter. There are two types of counters based on the type of output from right most D flip-flop is connected to the serial input. Shift registers are also used as counters. Shift register along with some additional gate(s) generate the sequence of zeros and ones. It is utilized at the receiver section before Digital to Analog Converter (DAC) block. Shift register is used as Serial to parallel converter, which converts the serial data into parallel data. It is utilized at the transmitter section after Analog to Digital Converter (ADC) block.
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Shift register is used as Parallel to serial converter, which converts the parallel data into serial data. Following are the applications of shift registers. Based on the requirement, we can use one of those shift registers. In previous chapter, we discussed four types of shift registers.