
1997 Jul 01
23
Philips Semiconductors
Preliminary specication
I2C-bus controlled economy PAL/NTSC
and NTSC TV-processors
TDA837x family
Table 16 Interlace
Table 17 Standby
Table 18 Synchronization mode
Table 19 Colour decoder mode
Table 20 Automatic volume levelling
(TDA8373 and TDA8374)
Table 21 RGB blanking mode (TDA8375 and TDA8377)
DL
STATUS
0
interlace
1
de-interlace
STB
MODE
0
standby
1
normal
POC
MODE
0
synchronization active
1
synchronization not active
CM2
CM1
CM0
DECODER MODE
0
not forced, own intelligence, two
crystals
0
1
forced crystal pin 34
(PAL/NTSC)
0
1
0
forced crystal pin 34 (PAL)
0
1
forced crystal pin 34 (NTSC)
1
0
forced crystal pin 35
(PAL/NTSC)
1
0
1
forced crystal pin 35 (PAL)
1
0
forced crystal pin 35 (NTSC)
1
forced SECAM crystal pin 35
AVL
LEVEL
0
automatic volume levelling not active
1
automatic volume levelling active
HBL
MODE
0
normal blanking with horizontal blanking
pulse
1
wider blanking to obtain well dened edges
Table 22 Black current stabilization
Table 23 Video identication mode
Table 24 Gain of luminance channel
Table 25 Vertical divider mode
Table 26 Search tuning mode
Table 27 Video identication mode
Table 28 Long blanking mode (TDA8374 and TDA8375)
AKB
STABILIZATION
0
black-current stabilization on
1
black-current stabilization off
VIM
VIDEO IDENT MODE
0
video identication coupled to the internal
CVBS input (pin 13)
1
video identication coupled to the selected
CVBS input
GAI
GAIN
0
normal gain of luminance channel
[V27 = 1.0 V (b-w)]
1
high gain of luminance channel
[V27 = 0.45 V (p-p)]
NCIN
VERTICAL DIVIDER MODE
0
normal operation of the vertical divider
1
vertical divider switched to search window
STM
SEARCH TUNING MODE
0
normal operation
1
reduced sensitivity of the coincidence
detector (bit SL)
VID
VIDEO IDENT MODE
0
video identication switches phase 1 loop on
and off
1
video identication not active
LBM
BLANKING MODE
0
blanking adapted to standard (50 or 60 Hz)
1
xed blanking in accordance with 50 Hz
standard