9.4. Layer Mapping
The layer positions determine whether an input is mixed in the background (layer 0) through to the foreground (layer N, where N is the number of inputs minus one) in the final output image.
Note: if there are any repeated values within the Layer Position registers (indicating that two inputs are mapped to the same layer), the input with the repeated layer position value will not be displayed and will be consumed.
If you turn off the Layer Position Enable parameter, the Mixer II IP core uses a direct mapping between the ordering of the inputs and the mixing layers. For example, Layer 0 will be mapped to Input 0, Layer 1 to Input 1, and so on.
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