adv7188 Analog Devices, Inc., adv7188 Datasheet - Page 87

• Manufacturer Part Number: adv7188
• Description: Multiformat Sdtv Video Decoder With Fast Switch Overlay Support
• Manufacturer: Analog Devices, Inc.

Address
0x14
0x15
0x17
Register
Analog Control
Internal (Write Only)
Analog Clamp
Control
Digital Clamp
Control 1
Shaping Filter
Control
Bit Description
FREE_RUN_ACT.
STD_FLD_LEN.
INTERLACED.
PAL_SW_LOCK.
Reserved.
XTAL_TTL_SEL.
Reserved.
Reserved.
CCLEN. Current clamp enable. This bit allows
the user to switch off the current sources in
the analog front end.
Reserved.
Reserved.
DCFE. Digital clamp freeze enable.
DCT [1:0]. Digital clamp timing. These bits
determine the time constant of the digital
fine-clamp circuitry.
Reserved.
YSFM [4:0]. Selects Y-shaping filter mode
when in CVBS only mode. These bits allow
the user to select a wide range of low-pass
and notch filters.
Rev. A | Page 87 of 112
7 6 5 4 3 2 1 0 Comments
x
0 0 0 0 0
0 0 0
0
x
0 0
0 1
1 0
1 1
x
x
0
1
0
1
0 0 0 0 0 Automatically uses wide notch
0 0 0 0 1 Automatically uses narrow notch
0 0 0 1 0 SVHS 1
0 0 0 1 1 SVHS 2
0 0 1 0 0 SVHS 3
0 0 1 0 1 SVHS 4
0 0 1 1 0 SVHS 5
0 0 1 1 1 SVHS 6
0 1 0 0 0 SVHS 7
0 1 0 0 1 SVHS 8
0 1 0 1 0 SVHS 9
0 1 0 1 1 SVHS 10
0 1 1 0 0 SVHS 11
0 1 1 0 1 SVHS 12
0 1 1 1 0 SVHS 13
0 1 1 1 1 SVHS 14
1 0 0 0 0 SVHS 15
1 0 0 0 1 SVHS 16
1 0 0 1 0 SVHS 17
1 0 0 1 1 SVHS 18 (CCIR 601)
1 0 1 0 0 PAL NN 1
1 0 1 0 1 PAL NN 2
1 0 1 1 0 PAL NN 3
1 0 1 1 1 PAL WN 1
1 1 0 0 0 PAL WN 2
1 1 0 0 1 NTSC NN1
1 1 0 1 0 NTSC NN2
1 1 0 1 1 NTSC NN3
1 1 1 0 0 NTSC WN 1
1 1 1 0 1 NTSC WN 2
1 1 1 1 0 NTSC WN 3
1 1 1 1 1 Reserved
Bit
0 0 1 0 Set to default
x x x x Set to default
1
0
1
0 0
1 = free-run mode active
1 = field length standard
1 = interlaced video detected
1 = swinging burst detected
Crystal used to derive
28.63636 MHz clock
External TTL level clock supplied
Current sources switched off
Current sources enabled
Set to default
Disable digital clamp freeze
Enable digital clamp freeze
Slow (TC = 1 sec)
Medium (TC = 0.5 sec)
Fast (TC = 0.1 sec)
TC dependent on video
Set to default
filter for poor quality sources and
wideband filter with comb for
good quality input
filter for poor quality sources and
wideband filter with comb for
good quality input
Notes
Blue screen output
Correct field length found
Field sequence found
Reliable swinging burst sequence
Decoder selects optimum Y-shaping
filter depending on CVBS quality.
If one of these modes is selected, the
decoder does not change filter modes.
A fixed filter response (the one selected)
is used regardless of video quality.
ADV7188