
2004 Jul 22
123
Philips Semiconductors
Product specication
Multistandard video decoder with adaptive
comb lter and component video input
SAA7118
15.2.15 SUBADDRESS 0EH
Table 53 Chrominance control 1; 0EH[7:0]
BIT
DESCRIPTION
SYMBOL
VALUE
FUNCTION
50 Hz/625 LINES
60 Hz/525 LINES
D7
clear DTO
CDTO
0
disabled
1
Every time CDTO is set, the internal subcarrier DTO
phase is reset to 0
° and the RTCO output generates a
logic 0 at time slot 68 (see document “RTC Functional
Description”, available on request). So an identical
subcarrier phase can be generated by an external device
(e.g. an encoder); if a DTO reset is programmed via
CDTO it has always to be executed in the following way:
1. Set CDTO = 0
2. Set CDTO = 1.
D[6:4]
colour standard selection
in non AUTO mode
CSTD[2:0]
000
PAL BGDHI (4.43 MHz) NTSC M (3.58 MHz)
001
NTSC 4.43 (50 Hz)
PAL 4.43 (60 Hz)
010
Combination-PAL N
(3.58 MHz)
NTSC 4.43 (60 Hz)
011
NTSC N (3.58 MHz)
PAL M (3.58 MHz)
100
reserved
NTSC-Japan (3.58 MHz)
101
SECAM
reserved
110
reserved; do not use
111
reserved; do not use
D[6:4]
colour standard selection
in AUTO mode (AUTO
mode is selected, if either
AUTO0 or AUTO1 is set;
see below)
CSTD[2:0]
000
PAL BGDHI (4.43 MHz)
NTSC M (3.58 MHz)
001
reserved; do not use
010
reserved; do not use
011
reserved; do not use
100
PAL BGDHI (4.43 MHz)
NTSC-Japan (3.58 MHz, no
7.5 IRE offset)
101
SECAM
NTSC M (3.58 MHz)
110
reserved; do not use
111
reserved; do not use
D3
disable chrominance
vertical lter and PAL
phase error correction
DCVF
0
chrominance vertical lter and PAL phase error
correction on (during active video lines)
1
chrominance vertical lter and PAL phase error
correction permanently off
D2
fast colour time constant
FCTC
0
nominal time constant
1
fast time constant for special applications (high quality
input source, fast chroma lock required, automatic
standard detection off)