PNX1301EH NXP Semiconductors, PNX1301EH Datasheet - Page 215

• Manufacturer Part Number: PNX1301EH
• Manufacturer: NXP Semiconductors

Specifications of PNX1301EH

• Lead Free Status / RoHS Status: Not Compliant

Philips Semiconductors
Table 14-1. Image Overlay Formats
14.4.2
The ICP accepts image overlay data in three formats,
RGB 24+α, RGB 15+α, and YUV-4:2:2+α as shown in
Table
type as the output image format generated by the ICP for
the main image. For example, if the output image is one
of the RGB formats, the overlay must be one of the two
RGB overlay formats, RGB-24-α and RGB-15+α. If the
output image format is YUV, the overlay format must be
in YUV-4:2:2+α format. The formats must be of the same
type because the ICP does no conversion on the overlay
data.
In RGB 24+α, pixels are packed 1 pixel/word, a full byte
of alpha information (stored in the most significant byte)
is included with each pixel. In RGB 15+α, one bit of alpha
is included for each pixel. The pixels in the overlay image
are packed as 2 pixels per 32-bit word, and the alpha bit
is the most significant bit of each half word. In the same
manner, the YUV-4:2:2+α format packs two pixels into
one 32-bit word, and has one bit of alpha for each pixel.
The least significant bit of the U and V components sup-
plies the alpha bit for the Y0 and Y1 pixels, respectively.
The alpha bit in these formats selects between two alpha
values stored in the ICP, alpha 1 and alpha 0. The alpha
1 and alpha 0 values are loaded from the parameter
block when the ICP is started.
Table 14-3. Output Data Formats
RGB 24-packed
RGB 8A: 233
RGB 8R: 332
YUV-4:2:2+α
RGB 15+α
RGB 24+α
YUV- 4:2:2
RGB 24+α
RGB 15+α
RGB-16
Format
Format
14-1. The overlay image format must be the same
Image Overlay Formats
Word
1
1
1
1
1
1
2
3
1
α r4 r3 r2 r1 r0 g4 g3
Bits 31-24
r1 r0 g2 g1 g0 b2 b1 b0
r2 r1 r0 g2 g1 g0 b1 b0
r4 r3 r2 r1 r0 g5 g4 g3
α r4 r3 r2 r1 r0 g4 g3
a7 - a0
Y1
Bits 31-24
Pixel 3
a7 - a0
G2
B1
R3
Y1
Pixel 1
g2 g1 g0 b4 b3 b2 b1 b0
Pixel 1
g2 g1 g0 b4 b3 b2 b1 b0
g2 g1 g0 b4 b3 b2 b1 b0
r1 r0 g2 g1 g0 b2 b1 b0
r2 r1 r0 g2 g1 g0 b1 b0
(v7-v1) + α
Bits 23-16
r7 - r0
Bits 23-16
Pixel 2
r7 - r0
G3
R0
B2
V0
Packed 4 Pixels/3 Words
14.4.3
Image overlay uses alpha blending, which combines the
overlay image with the main image according to the al-
pha value. The alpha value is supplied by the alpha byte
in RGB 24+α format and by the alpha registers, Alpha 0
and Alpha 1 in the other formats. The alpha code format
is shown in
Table 14-2. Alpha Blending Codes
14.4.4
The output formats are the RGB image formats sent to
the PCI interface or SDRAM. These formats are shown
in
PRELIMINARY SPECIFICATION
Packed 2 Pixels/Word
Alpha Code
Table
80h - FFh
1 Pixel/Word
00h
20h
40h
60h
14-3. Note: B1 = Byte 1 of blue = [b7...b0]
α r4 r3 r2 r1 r0 g4 g3
Alpha Blending Codes
Output Formats
r1 r0 g2 g1 g0 b2 b1 b0
r2 r1 r0 g2 g1 g0 b1 b0
Table
r4 r3 r2 r1 r0 g5 g4 g3
α r4 r3 r2 r1 r0 g4 g3
Bits 15-8
Alpha Value
g7 - g0
Bits 15-8
128-255
Y0
14-2.
g7 - g0
Pixel 1
32
64
96
G0
R1
B3
Y0
0
Pixel 0
Pixel 0
Image Coprocessor
Image
100%
g2 g1 g0 b4 b3 b2 b1 b0
75%
50%
25%
0%
g2 g1 g0 b4 b3 b2 b1 b0
g2 g1 g0 b4 b3 b2 b1 b0
r1 r0 g2 g1 g0 b2 b1 b0
r2 r1 r0 g2 g1 g0 b1 b0
(u7-u1) + α
Bits 7-0
b7 - b0
Bits 7-0
Pixel 0
b7 - b0
G1
B0
R2
U0
Overlay
100%
25%
50%
75%
0%
1
.
14-5