Question

4) We need to send an ASCII code of 0110011 by using a serial communication standard that uses a 250 MHz clock.

4.1) How long will it take to transmit the code including the start bit, the stop bit of 1 clock pulse, and the parity bit?

4.2) And what is the logic state of the serial line 10 nano second after transmission started? Explain by illustrating a waveform for Tx_Data.

Answer 1

Given data

Serial Communication is used

ASCII code 0110011 is transmitted

Apart from these 7 bits, one start bit,one stop bit and one parity bit are also used

So, completely we need to send 10 bits.

1 answer

1st ==> start bit

2 - 8 ==> ASCII code

9th ==> Parity bit

10th ==> Stop bit

We have a clock pulse of 250 MHZ

Time period of one clock pulse = 1/f

                                            = 1/250x106

                                            = 4x10-9

                                            = 4 nSec

So, To send all 10 bits required time period = 10x4nSec

                Required time to transmit the code = 40nSec

2 answer

If i take Start bit = 1

            Stop bit = 0

Let me take even odd parity. The data is having even number of 1s. So, we need to take parity bit = 1

So, transmitted data will be 1011001110