ch7004c Chrontel, ch7004c Datasheet - Page 32

• Manufacturer Part Number: ch7004c
• Description: Digital Pc To Tv Encoder With Macrovisiontm
• Manufacturer: Chrontel

CHRONTEL
Video Bandwidth Register
This register enables the selection of alternative filters for use in the luma and chroma channels. There are currently
four filter options defined for the chroma channel, 4 filter options in the S-Video luma channel and two filter options
in the composite luma channel. The Table 19 and Table 20 below show the various settings.
Bit 6 (CVBW) outputs the S-Video luma signal on both the S-Video luma output and the CVBS output. A "1" in this
location enables the output of a black and white image on composite, thereby eliminating the degrading effects of
the color signal (such as dot crawl or false colors), which is useful for viewing text with high accuracy.
Bit 7 (FLFF) controls the flicker filter used in the 7/10’s scaling modes. In these scaling modes, setting FLFF to 1
causes a five line flicker filter to be used. The default setting of 0 uses a four line flicker filter.
Input Data Format Register
This register sets the variables required to define the incoming pixel data stream.
32
Table 19. Luma Filter Bandwidth
Table 20. Chroma Filter Bandwidth
Bit:
Symbol:
Type:
Default:
YCV
0
1
YSV[1:0]
00
01
10
11
YPEAK
0
1
CBW[1:0]
0 0
0 1
1 0
1 1
Bit:
Symbol:
Type:
Default:
7
FLFF
R/W
0
7
Luma S-Video Filter Adjust
Luma Composite Video Filter Adjust
Low bandwidth
High bandwidth
Low bandwidth
Medium bandwidth
High bandwidth
Reserved (decode this and handle the same as 10)
Disables the Y-peaking circuit
Disables the peaking filter in luma S-Video channel
Enables the peaking filter in luma S-Video channel
Luma Composite Video Filter Adjust
Low bandwidth
Medium bandwidth
Med-high bandwidth
High bandwidth
6
CVBW
R/W
0
6
DACG
R/W
0
5
CBW1
R/W
0
5
RGBBP
R/W
0
4
CBW0
R/W
0
4
3
IDF3
R/W
0
3
YPEAK
R/W
0
R/W
2
IDF2
0
201-0000-024 Rev. 2.4, 6/24/2004
2
YSV1
R/W
0
Address: 03H
Bits: 7
Address: 04H
Bits: 7
Symbol: VBW
Symbol: IDF
1
IDF1
R/W
0
1
YSV0
R/W
0
CH7004C
0
IDF0
R/W
0
0
YCV
R/W
0