ADV7185 Datasheet, PDF (33/40 Pages) Analog Devices – Professional NTSC/PAL Video Decoder with 10-Bit CCIR656 Output

ADV7185
Table XL. Luma Gain Control 1 Register (Subaddress 2F)
Bit Description
LMG[11:8] ¹
RESERVED
LAGT[1:0] ²
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Register Setting
XXXX
11
Set to One
00
Slow (TC = 2 sec)
01
Medium (TC = 1 sec)
10
Fast (TC = 0.2 sec)
11
Dependent on VID_QUAL
NOTES
1_{Luma Manual Gain. Can be used to program a desired manual chroma gain or read back the actual used gain value. LAGC[1:0] settings will decide in which mode}
LMG[11:0] will operate.
2_{Luma Automatic Gain Timing. Allows adjustment of the Luma AGC tracking speed. Will only have effect if LAGC[1:0] is set to auto gain (10b).}
Table XLI. Luma Gain Control 2 Register (Subaddress 30)
Bit Description Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Register Setting
LMG[7:0]*
XXXXXXXX
*Luma Manual Gain. Can be used program a desired manual chroma gain or read back the actual used gain value.
Table XLII. Manual Gain Shadow Control 1 Register (Subaddress 31)
Bit Description Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Register Setting
LMGS[11:8]¹
XXXX
RESERVED
111
Set to One
SGUE²
0
Disable LMGS Update
1
Use LMGS Update Facility
NOTES
1_{Luma Manual Gain Store. Has dual functions; a desired manual luma gain can be programmed or a readback from the register will return the actual gain used. Gain}
value will only become active when LAGC[2:0] set to manual fixed gain. The function and readback value are dependent on LAGC[2:0] setting.
2_{Surveillance Gain Update Enable. Enables surveillance mode operation (see LMGS[11:0] for details).}
Table XLIII. Manual Gain Shadow Control 2 Register (Subaddress 32)
Bit Description Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Register Setting
LMG[7:0]*
XXXXXXXX
*Chroma Manual Gain. Lower 8 bits, see LMG[11:8] for description.
Table XLIV. Miscellaneous Gain Control Register (Subaddress 33)
Bit Description
PW_UPD ¹
AV_AL ²
MIRE[2:0] ³
RESERVED
CKE ⁴
RESERVED
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Register Setting
0 Update Gain Once per Line
1 Update Gain Once per Field
0
Lines 33 to 310
1
Lines 33 to 270
000
PAL-133 NTSC-122
001
PAL-125 NTSC-115
010
PAL-120 NTSC-110
011
PAL-115 NTSC-105
100
PAL-110 NTSC-100
101
PAL-105 NTSC-100
110
PAL-100 NTSC-100
111
PAL-100 NTSC-100
1
Set to One
0
Color Kill Disabled
1
Color Kill Enabled
1
Set to One
NOTES
1_{Peak White Update. Determines the gain based on measurements taken from the active video; this bit determines the rate of gain change. LAGC[1:0] must be set to}
the appropriate mode to enable peak white or average video in the first case.
2_{Average Brightness Active Lines. Allows the selection between two ranges of active video to determine the average brightness.}
3_{Max IRE. Sets the max I/p IRE level depending on the video standard.}
4_{Color Kill Enable. Allows the optional color kill function to be switched on or off.}
REV. 0
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