Data Translation DT3152-LS, Руководство пользователя

Страница: 55 / 214

Principles of Operation
39
2
2
2
2
2
2
2
2
2
Vertical Video Signal
Each field of video contains vertical sync information, blanking
information, and lines of active video.
Figure 11 shows the
components of a single vertical field of video. Line measurements are
relative to the vertical reference point
, which is defined as the
beginning of the vertical sync.
Note that the frame is an area that you establish within the active
video area. For more information about frames, refer to
page 46 .
Figure 11: Vertical Video Signal
For area-scan operations only, you can use software to define the
vertical input settings for the DT3152-LS board.
Table 5 lists the
settings you can program. You cannot define vertical input settings
for line-scan operations.
Blanking
0 1 2 3
n-1
Vertical Reference
Point
First Active Line
Frame Top
Frame Height
Active Video
Vertical Sync
Active Line Count
Total Lines Per Field