參數(shù)資料
型號(hào): SAA7146A
廠商: NXP Semiconductors N.V.
英文描述: Multimedia bridge, high performance Scaler and PCI circuit SPCI
中文描述: 多媒體橋梁,高性能潔牙機(jī)和PCI電路SPCI
文件頁(yè)數(shù): 81/144頁(yè)
文件大?。?/td> 645K
代理商: SAA7146A
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1998 Apr 09
81
Philips Semiconductors
Product specification
Multimedia bridge, high performance
Scaler and PCI circuit (SPCI)
SAA7146A
Table 59
α
RGB-32 format
Table 60
RGB-24 packed format
PACKING WITHIN 32-BIT Dword
BIT 31 TO BIT 24
α
/
α
/
BIT 23 TO BIT 16
BIT 15 TO BIT 8
BIT 7 TO BIT 0
R
V
G
Y
B
U
BUS CYCLE
PACKING WITHIN 32-BIT Dword
BIT 31 TO BIT 24
BIT 23 TO BIT 16
BIT 15 TO BIT 8
BIT 7 TO BIT 0
1
2
3
B
1
G
2
R
3
R
0
B
2
G
3
G
0
R
1
B
3
B
0
G
1
R
2
The following formats use two pixels per Dword and derive
RGB from RGB-24 by truncation or by error diffusion
dither. The byte phase of the first sample each line is
defined by LSB + 1 of DMA base. ‘
α
’ is the colour key.
RGB-16 (5 : 6 : 5): Red has 5 bits, Green has 6 bits,
Blue has 5 bits
RGB-15 (
α
: 5 : 5 : 5):
α
-bit, Red has 5 bits, Green has
5 bits, Blue has 5 bits
RGB-15 (5 : 5 :
α
: 5): Red has 5 bits, Green has 5 bits,
α
bit, Blue has 5 bits.
Table 61
RGB-16 formats Dword
PACKING WITHIN 32-BIT Dword
BIT 31 TO BIT 16
BIT 15 TO BIT 0
Pixel
1
Pixel
0
7.11.1.2
YUV
All YUV formats are based on CCIR coding:
Luminance Y in straight binary:
Black: Y = 16 of 256 linear coding
White: Y = 235 of 256 linear coding.
Colour difference signals UV in offset binary:
No colour: U = V = 128 of 256 steps
Full colour: U = V = 128
±
112 steps.
YUV 4 : 2 : 2:
U and V sampled co-sided with first
Y sample (of 2 samples in-line). Byte phase of the first
sample each line is defined by bit 0 and bit 1 of DMA
base address (see Table 62).
YUV 4 : 1 : 1:
U and V sampled co-sided with first
Y sample, (of 4 samples in-line), 8 samples are packed
in 3 Dwords (see Table 63).
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