cx25840 Conexant Systems, Inc., cx25840 Datasheet - Page 230

• Manufacturer Part Number: cx25840
• Description: Video Decoder And Broadcast Audio
• Manufacturer: Conexant Systems, Inc.

Register Map
5-88
[7:0]
Comb Filter Enable
[7]
[6]
[5]
[4]
[3]
[2]
[1]
[0]
Subcarrier Step Size Low
Bits
Bits
RW
WR
RW
RW
RW
RZ
RW
RW
RW
Type
Type
1
1
1
0
0
1
1
0
0x1F
Default
Default
SC_STEP_LOW
CCOMB_2LN_CHECK
CCOMB_3LN_EN
CCOMB_2LN_EN
RESERVED
RESERVED
LCOMB_3LN_EN
LCOMB_2LN_EN
RESERVED
Name
Name
Conexant
Lower byte of the chroma subcarrier DTO step size value.
Chroma subcarrier DTO step size,
F
where F
the pixel rate used in this calculation should be based on the
exact pixel rate that is defined in the SRC_DECIM_RATION field
of the SRC_COMB_CFG register above:
F
Note: This does not imply that the effective pixel rate is only as
accurate as this equation. This equation just determines the
initial pixel rate, which will then be fine-tuned to achieve the
exact ratio. However, the initial subcarrier frequency must be
based on the initial pixel rate.
Enables the adaptation algorithm to check for all luma sections
on adjacent lines. NTSC only. Only applicable to -24 part.
Enables the adaptation algorithm to choose the 3-line chroma
comb.
0 = Disable
1 = Enable
Enables the adaptation algorithm to choose the 2-line chroma
comb.
0 = Disable
1 = Enable
Enables the adaptation algorithm to choose the 3-line luma
comb.
0 = Disable
1 = Enable
Enables the adaptation algorithm to choose the 2-line luma
comb.
0 = Disable
1 = Enable
sc
pix
/F
= 256/src_decim_ration x F
pix
sc
x 2
= subcarrier frequency, and F
21
Description
Description
in
.
pix
CX25840/1/2/3 Data Sheet
= pixel rate. However,
Address 0x47B
Address 0x47C
102284B
8/3/05