Philips Semiconductors
Preliminary specification
PAL/NTSC/SECAM video decoder with adaptive PAL/NTSC
comb filter, VBI-data slicer and high performance scaler
SAA7114H
15.2.15 SUBADDRESS 0EH
Table 51 Chrominance control 1; 0EH[7:0]
FUNCTION
50 Hz/625 LINES
disabled
BIT
D7
DESCRIPTION
clear DTO
SYMBOL
VALUE
60 Hz/525 LINES
CSTDO
0
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 external document “RTC
Functional Description”, available on request). So an
identical subcarrier phase can be generated by an
external device (e.g. an encoder).
D[6:4] colour standard selection CSTD[2:0]
000
001
010
PAL BGDHI (4.43 MHz)
NTSC 4.43 (50 Hz)
NTSC M (3.58 MHz)
PAL 4.43 (60 Hz)
Combination-PAL N
(3.58 MHz)
NTSC 4.43 (60 Hz)
011
100
101
110
111
0
NTSC N (3.58 MHz)
reserved
PAL M (3.58 MHz)
NTSC-Japan (3.58 MHz)
reserved
SECAM
reserved; do not use
reserved; do not use
D3
disable chrominance
vertical filter and PAL
phase error correction
DCVF
chrominance vertical filter and PAL phase error
correction on (during active video lines)
1
chrominance vertical filter and PAL phase error
correction permanently off
D2
D0
fast colour time constant FCTC
0
1
0
1
nominal time constant
fast time constant for special applications
adaptive chrominance
comb filter
CCOMB
disabled
active
15.2.16 SUBADDRESS 0FH
Table 52 Chrominance gain control; 0FH[7:0]
BIT
DESCRIPTION
SYMBOL
VALUE
FUNCTION
D7 automatic chrominance
gain control
ACGC
0
1
on
programmable gain via CGAIN6 to CGAIN0; need to be
set for SECAM standard
D[6:0] chrominance gain value
(if ACGC is set to logic 1)
CGAIN[6:0] 000 0000 minimum gain (0.5)
010 0100 nominal gain (1.125)
111 1111 maximum gain (7.5)
2000 Mar 15
97
NXP [ NXP ]
