PNX1502E Datasheet, PDF (785/819 Pages) NXP Semiconductors – Connected Media Processor

Philips Semiconductors
Volume 1 of 1
PNX15xx Series
Chapter 28: Pixel Formats
32-bit formats are accepted and produced by all units except the MPEG-2 decoder.
31
24 23
16 15
alpahlpaha
R
G
31
24 23
16 15
alpahlapha
VR
YG
87
B
87
U
1 byte
0
RGBa 8888
0
YUVa 444
memory address A
left-most pixel
memory address A+4
next pixel
Figure 4: 32-Bit/Pixel Packed Formats
......
memory address A+4k
right-most pixel
32-bit word
3.4 Packed YUV 4:2:2 Formats
Packed YUV 4:2:2 formats store two horizontally adjacent pixels into two 16-bit units.
Each pixel has an individual luminance (Y1 for the left of the pair, Y2 for the right of
the pair). There is a single U and V value associated with the pair. The U and V
values are taken from the same spatial position as the Y1 sample (Figure 7).
There are two variants of packed YUV 4:2:2: the Microsoft ‘UYVY’ format and the
Microsoft ‘YUY2’ format. The big-endian view of the YUY2 format is identical to the
Power MacIntosh ‘2vuy’ format.
Figure 5 and Figure 6 show the software view of UYVY and YUY2/2vuy. Two
successive 16-bit units contain a pair of pixels. This view is independent of system
endian mode.
UYVY
15
87
0
1st unit
Y1
U
31
24 23
16
2nd unit
Y2
V
1 byte
memory address A
left-most pixel pair, 1st unit
memory address A+2
left-most pixel pair, 2nd unit ^{. . . . . .}
memory address A+4k+2
right-most pixel pair, 2nd unit
16-bit word
Figure 5: UYVY Packed YUV 4:2:2 Format
12NC 9397 750 14321
Product data sheet
Rev. 2 — 1 December 2004
© Koninklijke Philips Electronics N.V. 2002-2003-2004. All rights reserved.
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