VSP 94x2A
DATA SHEET
Table 2–3: Allowed combinations for color-standard
search (50 Hz)
ACCFRZ holds the current ACC value. The maximum
amplification of the ACC can be limited by ACCLIM.
This results a smooth attenuation of color intensity for
weak color carrier (see Fig. 2–5).
Standard
(50 Hz)
None
CSTAND
D2
0
D1
0
D0
0
U,V
PAL N
0
0
1
+0dB
CON
PAL B
0
1
0
SECAM
1
0
0
Automatic
PAL BG / SECAM
1
1
0
color off
+6dB
-4dB
Table 2–4: Allowed combinations for color-standard
search (60 Hz)
CKILL
attenuation of
color-carrier
ACCLIM
Standard
(60 Hz)
CSTAND
PAL, NTSC operation
CONS
D6
0
D5
D4
1
D3
0
U,V
PAL M
0
1
0
1
+0dB
NTSC M
NTSC44
0
0
0
1
0
0
Automatic
0
1
0
PAL M / NTSC M
color off
Automatic
1
1
0
0(!)
NTSC M /
+6dB
-4dB
NTSC44/PAL60
attenuation of
color-carrier
CKILLS
In addition, a standard can be forced as well.
AMSTD50 selects whether PAL B or SECAM is tried
first in the automatic routine. AMSTD60 selects
whether NTSC44/PAL60 or NTSC M is tried first. Both
bits can also be set for automatic detection, then the
last detected chroma standard will be used. For
SECAM detection, a choice between different recogni-
tion levels is possible (SCMIDL, SCMREL) and the
evaluated burst position is shiftable (BGPOS).
SECAM operation
Fig. 2–5: Color Killer Adjustment
Color standard (STDET), line standard (LNSTDRD)
and color killer status (CKSTAT) can be read out.
An Automatic Chroma Control (ACC) produces a sta-
ble output for input chroma variations from (approxi-
mately) -30 dB to +6 dB compared to nominal burst
value. The ACC reference value is programmable for NTSC
and PAL independently (NTSCREF, PALREF) to ensure
correct color saturation. With ACCFIX, the ACC is dis-
abled and a constant value (dependent on NTSCREF
and PALREF) is used instead.
10
Aug. 16, 2004; 6251-552-1DS
Micronas
MICRONAS [ MICRONAS ]
