10-12-2019 09:37 AM
can you expand upon your question please,
If the serial data rate is 10 Gb/s the serial clock does not equal 5 GHz.
Im taking a big guess here,
If you think of a data rate of 10M bit per second, and draw it out, each bit is 100 ns wide,
If that data was 1 0 1 0 1 0 1 0 and you draw it out,
then as above each bit is true for 100 ns,
the period between two rising edges is 200 ns.
And 200 ns period is 5 MHz.
BUT, 5 Mhz is NOT the clock frequency, its the fundamental of the data,
if you were to send a random stream of 1 and 0 out at 10 Mb/s, then you woud see on a spectrum analyser the fundamental at 5 MHz, and harmonics, I leave that as a exerics for the reader to predict what frequencies the harmonics would be at ..
10-13-2019 07:08 PM
tx serial data is updated on both rising edge and falling edge of the clock.
so clock frequency is line rate divided by 2.