The following table provides a detailed description of all the registers that apply to layers 0 through 16. Overlay layer 1 registers start at base address 0x0200, overlay layer 2 registers start at base address 0x300, and so forth.
Mixer IP has one primary layer, which we mention as layer0. It supports up to 16 overlay layers (Layer 1 to Layer 16). Layer 0 does not have any register for programming. For all overlay layers (Layer 1 to Layer 16) the registers are at identical offsets. Layer 1 registers start at base address 0x200, Layer 2 registers start at base address 0x300 and so forth. Layer 16 registers start at base address 0x1100. In this section, the register description number represents a number from 2 to 11.
| Address (hex) BASEADDR+ | Register Name | Access Type | Description |
|---|---|---|---|
| 0x0200 | Layer 1 Alpha | R/W |
Alpha blending value for layer 1 ranging from 0 = Fully transparent 256 = Fully opaque |
| 0x0208 | Layer 1 Start X | R/W | X position of the top left corner of layer 1, relative to the background layer. |
| 0x0210 | Layer 1 Start Y | R/W | Y position of the top left corner of layer 1, relative to the background layer |
| 0x0218 | Layer 1 Width | R/W | Active width (in pixels) of layer 1. |
| 0x0220 | Layer 1 Stride | R/W | Active stride (in bytes) of layer 1. |
| 0x0228 | Layer 1 Height | R/W | Active height (in lines) of layer 1. |
| 0x0230 | Layer 1 Scale Factor | R/W |
Scale factor for layer 1 ranging from 0 = No scaling 1 = 2x scaling (horizontally and vertically) 2 = 4x scaling (horizontally and vertically) |
| 0x0240 | Layer 1 Plane 1 Buffer | R/W | Start address of plane 1 of frame buffer for layer 1. Only valid in case layer 1 is a memory layer. |
| 0x024C | Layer 1 Plane 2 Buffer | R/W | Start address of plane 2 of frame buffer for layer 1. Only valid in case layer 1 is a memory layer and a semi-planar video format is selected. |