Figure 104: Synchronization Lock Robustness Measurement - Analog Devices Advantiv ADV7604 Hardware Manual

Figure 104: Synchronization Lock Robustness Measurement

The measurements are taken after the DPP section and before the clamp gain offset on a line-by-line
basis on all video lines but not during the VBI. For video lines during the VBI, the result of the last
active video line is kept.
The ISD[8:0] value changes dynamically on a line by line basis; the IFSD[8:0] is an averaged
version of the ISD[8:0]. The averaging length can be set to 128 or 256 lines of video.
ISD_THR[7:0] ISD Threshold Value , CP Map, Address 0x83, [7:0]
Function
ISD_THR[7:0]
00
All values other than
00
IFSD_AVG ISD Averaging Selection , CP Map, Address 0x84, [0]
Function
ISFD_AVG
0
1
ISD[8:0] ISD HLock Measurement Read Back , CP Map, Address 0xE3, [0]; Address 0xE4, [7:0]
Function
ISD[8:0]
x xxxx xxxx
IFSD[8:0] IFSD HLock Measurement Read Back , CP Map, Address 0xE3, [1]; Address 0xE5,
[7:0]
Function
IFSD[8:0]
x xxxx xxxx
Rev. F August 2010
video signal
ISD[8:0] value represents
area value
Description
The setting of 00 is special. A value of 00 causes the threshold to be
calculated automatically. The threshold is set to (level of horizontal
synchronization tip) + 0.5 * (horizontal synchronization depth).
Slice level value is set to (ISD_THR[7:0] * 8) in a 12-bit data range.
Description
ISD[8:0] is averaged over 128 lines of video to generate IFSD[8:0]
ISD[8:0] is averaged over 256 lines of video to generate IFSD[8:0]
Description
HLock measurement as defined above
Description
Averaged version of ISD[8:0]. Refer
averaging function.
colour burst
HS detection threshold
as per ISD_THR[7:0]
IFSD_AVG
297
ADV7604
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