Philips Semiconductors
Preliminary specification
PAL/NTSC/SECAM video decoder with adaptive PAL/NTSC
comb filter, VBI-data slicer and high performance scaler
SAA7114H
15.5.9 SUBADDRESSES A0H TO A2H
Table 111 Horizontal prescaling; register set A (A0H[5:0]) and B (D0H[5:0])
CONTROL BITS D5 TO D0
HORIZONTAL INTEGER PRESCALING RATIO (XPSC)
XPSC5 XPSC4 XPSC3 XPSC2 XPSC1 XPSC0
Not allowed
Down-scale = 1
Down-scale = 1⁄2
...
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
1
0
...
1
...
1
...
1
...
1
...
1
...
1
Down-scale = 1⁄63
Table 112 Accumulation length; register set A (A1H[5:0]) and B (D1H[5:0])
CONTROL BITS D5 TO D0
XACL5 XACL4 XACL3 XACL2 XACL1 XACL0
HORIZONTAL PRESCALER ACCUMULATION
SEQUENCE LENGTH (XACL)
Accumulation length = 1
Accumulation length = 2
...
0
0
0
0
0
0
0
0
0
0
0
1
...
1
...
1
...
1
...
1
...
1
...
1
Accumulation length = 64
Table 113 Prescaler DC gain and FIR prefilter control; register set A (A2H[3:0]) and B (D2H[3:0])
X = don’t care.
CONTROL BITS D3 TO D0
PRESCALER DC GAIN
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’;
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
e.g. XACL = 4
Weighting of samples inside sequence is factor ‘2’;
e.g. XACL = 4 sequence 1 + 2 + 2 + 2 + 1
sequence 1 + 1 + 1 + 1 + 1
1
X
X
X
2000 Mar 15
123
NXP [ NXP ]
