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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
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15 years ago

Hi Istvan,

Please correct me if I have misundertood, but you say that you are only using registers 0, 1, 3 and 4 when you update the control interface. Does this mean that you are not loading any coefficients into the Scaler II? The Scaler I supported a mode with constant compile time loaded coefficients. The user could select the coefficient set to use in the setup GUI and these would be loaded when the design is programmed to the device. However, the Scaler II currently does not support compile time coefficients (it is my underatanding that this feature should be supported in 11.0, but no guarantee) and so you must create and load coefficients at runtime through the control slave interface. If you don't load any coefficients the default contents of the coefficient memory will be used - probably all zeros - and that could explain why your output is all black.

Best regards,

Kieron