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Altera_Forum
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15 years ago

Scaler II vs Scaler problems

Hi, I have a working video processing design that includes the Scaler (v 9.1sp2). In the design I need to convert from 4:2:2 to 4:4:4, scale the video, and then go back to 4:2:2. With the Sc...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Hi Niki,

Everything you have described about your system looks normal so it is a bit worrying that it does not work. I think that checking the output of the Scaler II is the way to go (using SignalTap?). Check the values of the control packets to make sure the Scaler II is getting the correct resolution, and look for any large gaps in the Avalon-ST valid.

What are you using to update the control information for the VIP cores (through the Av-MM slave ports)? This may be a completely stupid question but it is always good to rule these things out (just in case), but when you update the control information for the Scaler II through the Av-MM slave are you definitely only writing to addresses 0, 3 and 4? The only reason I ask is that the old Scaler may have been more sympathetic to writes to coefficient registers that do not exist in bilinear mode, while the Scaler II has a very minimalist control slave that will probably do very bad things if you write to any registers that are beyond address 4. Sorry if that insults your intelligence, but it is always good to rule these things out.

If the SignalTap does not yeild any answers and you are using SOPC Builder could you attach the .sopc file for the simplified version of your design (if you are comfortable with doing this) and I will try to simulate the error.

Regards,

Kieron