SAA7108AE データシートの表示（PDF） - Philips Electronics
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SAA7108AE Datasheet PDF : 197 Pages
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Philips Semiconductors
HD-CODEC
Product specification
SAA7108AE; SAA7109AE
Table 228 Accumulation length; register set A [A1H[5:0]] and B [D1H[5:0]]
HORIZONTAL PRESCALER ACCUMULATION
SEQUENCE LENGTH (XACL)
Accumulation length = 1
Accumulation length = 2
...
Accumulation length = 64
CONTROL BITS 5 TO 0
XACL5 XACL4 XACL3 XACL2 XACL1 XACL0
0
0
0
0
0
0
0
0
0
0
0
1
...
...
...
...
...
...
1
1
1
1
1
1
Table 229 Prescaler DC gain and FIR prefilter control; register set A [A2H[7:4]] and B [D2H[7:4]]; note 1
FIR PREFILTER CONTROL
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)
PFUV1
X
X
X
X
0
0
1
1
CONTROL BITS 7 TO 4
PFUV0
X
X
X
X
0
1
0
1
PFY1
0
0
1
1
X
X
X
X
Note
1. X = don’t care.
PFY0
0
1
0
1
X
X
X
X
Table 230 Prescaler DC gain and FIR prefilter control; register set A [A2H[3:0]] and B [D2H[3:0]]; note 1
PRESCALER DC GAIN
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
XC2_1
X
X
X
X
X
X
X
X
0
1
CONTROL BITS 3 TO 0
XDCG2
0
0
0
0
1
1
1
1
X
XDCG1
0
0
1
1
0
0
1
1
X
X
X
Note
1. X = don’t care.
XDCG0
0
1
0
1
0
1
0
1
X
X
2004 Jun 29
181
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