SAA4956TJ View Datasheet(PDF) - Philips Electronics
Part Name
Description
Manufacturer
SAA4956TJ Datasheet PDF : 36 Pages
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Philips Semiconductors
2.9-Mbit field memory with noise reduction
Preliminary specification
SAA4956TJ
Table 6 Write registers
REGISTER BIT
NAME
DEFAULT
FUNCTION
Subregister 20H to 23H (Ksteps of the look-up tables of luminance and chrominance)
20H
0 to 3 Kstep0
2
step in adaptive curve from K = 1⁄16 to K = 1⁄8; weight of 1
4 to 7 Kstep1
3
step in adaptive curve from K = 1⁄8 to K = 2⁄8; weight of 1
21H
0 to 3 Kstep2
4
step in adaptive curve from K = 2⁄8 to K = 3⁄8; weight of 2
4 to 7 Kstep3
6
step in adaptive curve from K = 3⁄8 to K = 4⁄8; weight of 2
22H
0 to 3 Kstep4
4
step in adaptive curve from K = 4⁄8 to K = 5⁄8; weight of 4
4 to 7 Kstep5
6
step in adaptive curve from K = 5⁄8 to K = 6⁄8; weight of 4
23H
0 to 3 Kstep6
4
step in adaptive curve from K = 6⁄8 to K = 7⁄8; weight of 8
4 to 7 Kstep7
6
step in adaptive curve from K = 7⁄8 to K = 8⁄8; weight of 8
Subregister 24H (K-factor controls of luminance)
24H
0 to 3 Klumafix
15
value of the fixed K-factor of the luminance; see Table 3
4 to 6 Yadapt_gain 1
value of the gain of the adaptive curve of the luminance;
see Table 2
7
lumafix
0
adaptive (lumafix = 0) or fixed K mode (lumafix = 1) of the
luminance
Subregister 25H (K-factor controls of chrominance)
25H
0 to 3 Kchromafix
15
value of the fixed K-factor of the luminance; see Table 3
4 to 6 Cadapt_gain 1
value of the gain of the adaptive curve of the chrominance;
see Table 2
7
chromafix
0
adaptive (chromafix = 0) or fixed K mode (chromafix = 1) of
chrominance
Subregister 26H (miscellaneous)
26H
0
DPCMin
0
1
DPCMout
0
2
Klumatochroma 0
3
unfiltered
0
4
noise_shape 1
5
chroma_invert 0
6
split_screen 0
7
reserved
if HIGH: converts the chrominance input from DPCM to 4 : 2 : 2
format
if HIGH: converts the chrominance output from 4 : 2 : 2 to DPCM
format
if HIGH: uses luminance K-factor for chrominance path
if HIGH: band splitting is deactivated, complete difference signals
are used
if HIGH: noise shaping is activated
if HIGH: chrominance input signals U and V are inverted
if HIGH: demo mode is activated with noise reduction only at the
right screen side
Subregister 27H (miscellaneous)
27H
0
no_refresh
0
1
field_sync
0
2 to 7 reserved
if HIGH: disables internal self-refresh to allow Tcy(SWCK) = 29 ns
for PAN-IC
if HIGH: synchronizes the noise reduction via RSTW (split_screen
and DPCM not possible). Otherwise sync is line related detected
by WE 5 cycle LOW followed by a HIGH cycle.
1998 Dec 08
15
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