The higher the frequency, the more pronounced crosstalk gets and with it the higher the probability of a corrupted word and the need to retransmit it. Hence the receiver has to wait until all signal lines are settled - obviously, waiting lowers the transfer rate.Īnother good point (from this post) is that one needs to consider crosstalk with parallel signal lines. The higher the frequency, the more tiny differences matter. This cannot be guaranteed for high frequencies, as you cannot guarantee that the signal transit time is equal for all signal lines (think of different paths on the mainboard). You cannot increase the signal frequency for a parallel transmission without limit, because, by design, all signals from the transmitter need to arrive at the receiver at the same time. The reason modern devices use serial transmission is the following: 1 byte = 8 bits) but with a serial transmission only a fraction of it (e.g. With a parallel transmission you can transfer one word per cycle (e.g. Serial transmission is slower than parallel transmission given the same signal frequency.
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