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Observer peter.kuchnio
Observer
2,602 Views
Registered: ‎11-16-2015

VDMA MM2S Slave not advancing its read pointer

Hi,

 

We have a VDMA where the write side is the genlock master synchronized to TUSER. The read side is a genlock slave in free-run mode. I think I am configuring it correctly however I don't see the read pointer advancing.

 

The MM2S CR register is: 0x2008b

The S2MM CR register is: 0x21003

 

My stride reg is 0x2000f00 (it's a triple buffer)

 

I don't see any errors in the SR register.

 

I only see the read pointer advance when I read out a frame. What I would expect to happen is that the read side is always 2 frames behind the write.

 

What am I setting up incorrectly?

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