PXD20RM Datasheet, PDF (485/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

Field
EN
TILE_EN
SAFETY_EN
TRANS
BPP
RLE_EN
LUOFFS
BB
AB
Table 12-9. CtrlDescL0_4 field descriptions
Description
Enable the layer
1’b1: ON
1’b0: OFF
Enable the Tile Mode
1’b1: ON
1’b0: OFF
Safety Mode Enable Bit. Valid only for layer 0 and layer 1. For registers of all other layers, this
should be set to 0.
1’b1: Safety Mode is enabled for this layer
1’b0: Safety Mode is disabled
Transparency Level. Specifies the alpha value for the layer. This value may be used by the
blending engine to blend pixels on this layer. Value can vary between 0–255 where 0 is
completely transparent and 255 is completely opaque.
Bits Per Pixel
4’b0000 = 1 bpp
4’b0001 = 2 bpp
4’b0010 = 4 bpp
4’b0011 = 8 bpp
4’b0100 = 16 bpp (RGB565)
4’b0101 = 24 bpp
4’b0110 = 32 bpp (BGRA8888)
4’b0111 = Transparency mode 4 bpp
4’b1000 = Transparency mode 8bpp
4’b1001 = Luminance offset mode 4 bpp
4’b1010 = Luminance offset mode 8 bpp
4’b1011 = 16 bpp (ARGB1555)
4’b1100 = 16 bpp (ARGB4444)
4’b1101 = 16 bpp (APAL8)
4’b1110 = YCbCr422 (the blend engine allows only a single YCbCr layer in any blend operation)
4’b1111 = Reserved
Enable RLE mode for layer.
1’b1:Enabled
1’b0:Disabled
Look Up Table offset. Value gives the offset to the start address of the CLUT
(maximum value = 0x1FF for 512x32-bit entries).
Chroma Keying
1’b1: ON
1’b0: OFF
Alpha Blending
2’b00: No alpha Blending
2’b01: Blend only the pixels selected by chroma keying in case BB=1’b1
2’b10: Blend the whole frame
2’b11: Same functionality as 2’b00.
Freescale Semiconductor
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
12-23