2004 Mar 16
186
Philips Semiconductors
Product specification
PC-CODEC
SAA7108E; SAA7109E
Table 224
Accumulation length; register set A [A1H[5:0]] and B [D1H[5:0]]
Table 225
Prescaler DC gain and FIR prefilter control; register set A [A2H[7:4]] and B [D2H[7:4]]; note 1
Note
1.
X = don’t care.
Table 226
Prescaler DC gain and FIR prefilter control; register set A [A2H[3:0]] and B [D2H[3:0]]; note 1
Note
1.
X = don’t care.
HORIZONTAL PRESCALER ACCUMULATION
SEQUENCE LENGTH (XACL)
CONTROL BITS 5 TO 0
XACL5 XACL4 XACL3 XACL2 XACL1 XACL0
Accumulation length = 1
Accumulation length = 2
...
Accumulation length = 64
0
0
...
1
0
0
...
1
0
0
...
1
0
0
...
1
0
0
...
1
0
1
...
1
FIR PREFILTER CONTROL
CONTROL BITS 7 TO 4
PFUV1
PFUV0
PFY1
PFY0
Luminance FIR filter bypassed
H_y(z) =
1
4
(1 2 1)
H_y(z) =
1
8
(
1 1 1.75 4.5 1.75 1
1)
H_y(z) =
1
8
(1 2 2 2 1)
Chrominance FIR filter bypassed
H_uv(z) =
1
4
(1 2 1)
H_uv(z) =
1
32
(3 8 10 8 3)
H_uv(z) =
1
8
(1 2 2 2 1)
X
X
X
X
0
0
1
1
X
X
X
X
0
1
0
1
0
0
1
1
X
X
X
X
0
1
0
1
X
X
X
X
PRESCALER DC GAIN
CONTROL BITS 3 TO 0
XC2_1
XDCG2
XDCG1
XDCG0
Prescaler output is renormalized by gain factor = 1
Prescaler output is renormalized by gain factor =
1
2
Prescaler output is renormalized by gain factor =
1
4
Prescaler output is renormalized by gain factor =
1
8
Prescaler output is renormalized by gain factor =
1
16
Prescaler output is renormalized by gain factor =
1
32
Prescaler output is renormalized by gain factor =
1
64
Prescaler output is renormalized by gain factor =
1
128
Weighting of all accumulated samples is factor 1;
e.g. XACL = 4
sequence 1 + 1 + 1 + 1 + 1
Weighting of samples inside sequence is factor 2;
e.g. XACL = 4
sequence 1 + 2 + 2 + 2 + 1
X
X
X
X
X
X
X
X
0
0
0
0
0
1
1
1
1
X
0
0
1
1
0
0
1
1
X
0
1
0
1
0
1
0
1
X
1
X
X
X