Table: Layer Registers
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.
Table 2-12:
Layer Registers
|
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.
|