Hallo Prahlad,

I. you wrote:

I also think my 33pf capacitor to crystal traces are somewhat longer, can you please provide me some link or layout which has smaller traces.

What about this:



II. You wrote:

Still I couldn't get what do you mean by. Run them Both on the same side of the crystal?



This picture gives also an answer to this issue:

I wrote:

3. Power supply plane is relevantly interrupted arround connector X1. If you introduce some bridges for the lines running to this connector, then power supply plane is less broken.

You wrote:

I am sorry I couldnt get exactly what you meant by above. Please explain a bit more.


III. Next issue:

You wrote:

These beads are not available in local market, can you please suggest any other alternative?

If a soft ferrite bead is not available, then take another choke of about some micro Henrys of inductivity. Resonance frequency of this choke shall be as high as possible. So, do not use a choke, where the windings are sitting on each other. This gives heavy parasitic interwinding capacitance, which results in low resonance frequency. Choose a choke, where the windings are kept as separate as possible.


IV. Last issue:

I have noticed a big layout mistake! If you connect a number of digital lines from one board to a second, then you must also connect ground lines for the individual ground return currents with this certain cable!!!
These ground lines must be as close as possible to individual digital lines you transmit from board to board. Only by this, the formed loop (digital line and its ground return current) is kept minimal. If you do not provide such a close ground line for each digital line, then heavy radiation and susceptibility to radiation will be the consequence!
It's a good idea, to use a flat cable for this purpose, where each second, or at least third line is a ground line. All these ground lines MUST be connected to ground at each board!

Kai