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| 型號： | ISL98002CRZ-140 |
| 廠商： | Intersil |
| 文件頁數(shù)： | 15/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC VID DIGITIZER 3CHN AFE 72-QFN |
| 標準包裝： | 840 |
| 位數(shù)： | 8 |
| 通道數(shù)： | 3 |
| 功率（瓦特）： | 525mW |
| 電壓 - 電源，模擬： | 3 V ~ 3.6 V |
| 電壓 - 電源，數(shù)字： | 3 V ~ 3.6 V |
| 封裝/外殼： | 72-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 72-QFN（10x10） |
| 包裝： | 托盤 |
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22
FN6535.1
December 7, 2009
If there is video on Green (or Y-Channel) with no valid SOG
signal, the SOG activity detect bit may sometimes report
false positives (it will detect SOG when no SOG is actually
present). This is due to the presence of video with a
repetitive pattern that creates a waveform similar to SOG.
For example, the desktop of a PC operating system is black
during the front porch, horizontal sync, and back porch, then
increases to a larger value for the video portion of the
screen. This creates a repetitive video waveform very similar
to SOG that may falsely trigger the SOG Activity detect bit.
However, in these cases where there is active video without
SOG, the SYNC information will be provided either as
separate H and V sync on HSYNCIN and VSYNCIN, or
composite sync on HSYNCIN. HSYNCIN and VSYNCIN
should therefore be used to qualify SOG. The SOG Active bit
should only be considered valid if HSYNC Activity
Detect = 0. Note: Some pattern generators can output
HSYNC and SOG simultaneously, in which case both the
HSYNC and the SOG activity bits will be set, and valid. Even
in this case, however, the monitor should still choose
HSYNC over SOG.
TriLevel Sync Detect
Unlike SOG detect, the TriLevel Sync Detect function does
not check for 64 consecutive trilevel pulses in a row, and is
therefore less robust than the SOG detect function. It will
report false positives for SOG-less video for the same
reasons the SOG activity detect does, and should therefore
be qualified with both HSYNC and SOG. TriLevel Sync
Detect should only be considered valid if HSYNC Activity
Detect = 0 and SOG Activity Detect = 1.
If there is a SOG signal, the TriLevel Detect bit will operate
correctly for standard trilevel sync levels (600mVP-P). In
some real-world situations, the peak-to-peak sync amplitude
may be significantly smaller, sometimes 300mVp-p or less.
In these cases the sync slicer will continue to operate
correctly, but the TriLevel Detect bit may not be set. Trilevel
detection accuracy can be enhanced by polling the trilevel
bit multiple times. If HSYNC is inactive, SOG is present, and
the TriLevel Sync Detect bit is read as a 1, there is a high
likelihood there is trilevel sync.
TABLE 5. SYNC SOURCE DETECTION TABLE
HSYNC
DETECT
VSYNC
DETECT
SOG
DETECT
TRILEVEL
DETECT
RESULT
1
X
Sync is on HSYNC and VSYNC
1
0
X
Sync is composite sync on HSYNC. Set Input configuration register to CSYNC on
HSYNC and confirm that CSYNC detect bit is set.
0
1
0
Sync is composite sync on SOG. It is possible that trilevel sync is present but amplitude
is too low to set TriLevel Detect bit. Use video mode table to determine if this video
mode is likely to have TriLevel sync, and set clamp start, width values appropriately if
it is.
0
1
Sync is composite sync on SOG. Sync is likely to be trilevel.
0
X
No valid sync sources on any input.
ISL98002
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