Philips Semiconductors
Product specification
Multimedia bridge, high performance
Scaler and PCI circuit (SPCI)
SAA7146A
Table 87 HPS output and formats
OFFSET
(HEX)
NAME
BIT
TYPE
DESCRIPTION
78
matrix
31 and 30
RW
YUV to RGB conversion, gamma compensation
00: no YUV to RGB conversion
10: YUV to RGB conversion
linear
01: reserved
11: YUV to RGB conversion
with compensation of
gamma-pre-correction
−
29 and 28
−
reserved
outformat 27 to 24
23 and 22
RW
RW
RW
RW
output format, depends on matrix programming; see Table 88
chroma line select for INDEO-9
21 and 20
chroma pixel select for INDEO-9
SHIFT
17
0: normal mode, all bytes stay MSB aligned
1: shift mode, ‘shift right’ of all bytes, fill MSB position with logic 0,
this mode has meaning only for output formats defined in bytes,
undefined result in non-byte modes
DITHER
16
RW
dither: applies only to formats with reduced bit resolution, (#) that
derived from higher bit resolution formats:
1: dither is applied by ‘linear’ one-dimensional error diffusion
0: dither algorithm is not applied, just truncation
Table 88 Output formats
CODE (HEX)
OUTPUT FORMAT
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
YUV 4 : 2 : 2, (16 = 8 − 8), composed
RGB16 (5 : 6 : 5), composed, #
YUV 4 : 4 : 4, composed, ‘packed’
RGB24, composed, ‘packed’
reserved
αRGB32 (8 : 8 : 8 : 8), composed
YUV 4 : 1 : 1, composed
αRGB15 (1 : 5 : 5 : 5), composed, #
YUV2
RGαB15 (5 : 5 : 1 : 5), composed, #
reserved
reserved
Y8, monochrome
reserved
YUV8 (4 : 2 : 2), pseudo CLUT, #
RGB8 (3 : 3 : 2), pseudo CLUT, #
reserved
YUV 4 : 4 : 4, de-composed
YUV 4 : 2 : 2, de-composed
YUV 4 : 2 : 0 (22:1:1) MPEG, de-composed.
YUV9 (42:1:1) INDEO-9, de-composed.
reserved
reserved
reserved
reserved
Y1
reserved
reserved
Y2
reserved
YUV1
reserved
1998 Apr 09
96
NXP [ NXP ]
