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shairva
Explorer
Explorer
233 Views
Registered: ‎09-19-2018

aclken input in Video In to AXI4-Stream. Always high or not ?

Hi,

I have a small doubt about the input aclken in Video In to AXI4-Stream.

I'm making my first design with this IP core and I have reviewed some other designs.

Some of them, for example this one, have always that input in high level:

 

image

Other designs, have it connected to the video active flag signal:

image

So, I confused about which is the correct approach.

Can you please explain which is the correct/best approach?

Thanks in advance

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3 Replies
watari
Teacher
Teacher
229 Views
Registered: ‎06-16-2013

Hi @shairva 

 

This answer is very simple. It related with your purpose.

If your design have to change video timing without like glitch, you should control aclken.

If not necessary, you can tie it to high.

 

Hope this helps.

 

Best regards,

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shairva
Explorer
Explorer
201 Views
Registered: ‎09-19-2018

hi @watari 

change video timing without like glitch? what do you mean ?

I dont get you

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watari
Teacher
Teacher
130 Views
Registered: ‎06-16-2013

Hi @shairva 

 

You might be facing unexpected phenomenon when you tie to high at aclken.

So, I recommend the following to you.

 

# Change video timing

- Control aclken

 

# Don't change video timing

- Tie to high at aclken

 

Hope this helps.

 

Best regards,

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