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Bus synchronization when transferring data from one clock domain to another domain

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omid219

omid219

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Hi,

I want to transfer the data from one clock domain to another domain. Do I need to put dual synchronizer FF for all data bus and control lines or I just have to do synchronization for handshake signals?

Regards
 

Re: bus synchronization

Just for data_enable signals - signals that tell destination domain that data is valid. Also, make sure that data bus signals don't change at all when data_enable signal is valid.
 

Re: bus synchronization

>> put dual synchronizer FF for all data bus and control lines
or
>> do synchronization for handshake signals?
----------------------------------------------------------------------------

For bus signals cross clock domains, you SHOULD NOT use synchronizers for all data bus & control signals.

Synchronizer only works for signle bit.
-----------------------------------------------------------------------------

So just pass bus signals through a well-defined handshake protocol or a FIFO.
 

Re: bus synchronization

Hi,

Generally I use FIFO with two port for each clock domain
ask me if you need help

Best regards
 

Re: bus synchronization

Can you all please post some documentation on the synchronization? Or suggest some links which we can study?
 

Re: bus synchronization

this article may be helpful
 

Re: bus synchronization

Hey,

Use Handshaking mechanism if there are control signals and if the clock is of same frequency, else use a FIFO if the frequency difference of the two clocks is very large.

bye
regards
Raghu
 

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