參數(shù)資料
型號: 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
文件頁數(shù): 93/144頁
文件大?。?/td> 645K
代理商: SAA7146A
1998 Apr 09
93
Philips Semiconductors
Product specification
Multimedia bridge, high performance
Scaler and PCI circuit (SPCI)
SAA7146A
Table 79
HPS, horizontal prescaler
Table 80
Selection of output gain
OFFSET
(HEX)
NAME
BIT
TYP.
DESCRIPTION
68
31 and 30
29 to 27
reserved
DC gain control of X prescaler
(see Table 57): depending on the
number of active coefficients ‘2’ in the accumulation sequence and
the sequence length, the output amplitude gain has to be set to as
given in Table 80.
reserved
prescaling factor of the X PreSCaler
: defines accumulation
sequence length and subsampling factor of the input data stream:
XPSC = TRUNC (N
IP
/N
OP
1)
N
OP
= number of prescaler output pixel
N
IP
= number of qualified scaler input pixel.
X (horizontal) prescaler Accumulation Mode of accumulating
FIR
:
0: accumulating operates overlapping
1: non overlapping accumulation (must be set to bypass the
prescaler).
reserved
Coefficient select for X prescaler (luminance component Y)
:
for DC gain compensation of prescaler the accumulated pixels can
be weighted by ‘1’ or ‘2’. CXYi defines a sequence of 8 bits, which
control the coefficients:
CXYi = 0: pixel weighted by ‘1’
CXYi = 1: pixel weighted by ‘2’
Coefficient select for X prescaler (colour difference signals
UV)
: for DC gain compensation of prescaler the accumulated
pixels can be weighted by ‘1’ or ‘2’. CXUVi defines a sequence of
8 bits, which control the coefficients:
CXUVi = 0: pixel weighted by ‘1’
CXUVi = 1: pixel weighted by ‘2’
DCGX
RW
26 to 24
23 to 18
XPSC
RW
XACM
17
RW
16
CXY
15 to 8
RW
CXUV
7 to 0
RW
DCGX2
DCGX1
DCGX0
GAIN
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
1
1
2
1
4
1
8
1
2
1
4
1
8
1
16
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