length matching guidlines

[patilpradeep]

Hi All,

is it important to match length of address signal with data signals for Flash & PROM interfaces????

 

[anilrock87]

Hi,

I suggest you to go with the design guidelines provided by the manufacturer.

Regards
Anil

 

[patilpradeep]

Hi,

I suggest you to go with the design guidelines provided by the manufacturer.

Regards
Anil

Hi Anil,

In the datasheet I am not able see any length matching guidlines. So Pls suggest me how can I go ahead....
If you have any general guidlines then Pls share with me.


Regards,
Pradeep

 

[anilrock87]

Hi,

Follow the below thread, i hope this may be useful for you.

https://www.edaboard.com/threads/231518/

 

[sivamani]

If your operating freq is very less or it is async interface then u dont need length matching

 

[patilpradeep]

its operating at 50MHz, can i do length matching or no???

 

[sivamani]

May not be required.Just check the setup and hold margins from the datasheet..

 

[patilpradeep]

May not be required.Just check the setup and hold margins from the datasheet..

thanks sivamani,

I have one more question , some the traces are traveling bellow the SMD oscilator in my design. is this ok or not?

 

[Ice-Tea]

Without a ground layer in between? Not good design practice. The oscillator may introduce noise on the signal line or the signal line may interfere with the oscilator...

 

[sivamani]

could you please let me know ur layer count , stackup order and in which layer it is routed..As for Ice-Tea suggested there should be some isolation to avoid noise pickup..

 

[patilpradeep]

could you please let me know ur layer count , stackup order and in which layer it is routed..As for Ice-Tea suggested there should be some isolation to avoid noise pickup..

12 lyr Board. signals are traveling in 3rd layer(inner) & 2nd layer is Ground plane.

 

[sivamani]

In that case there will be any issue,because it is isolated with the GND plane.