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Theory of Operation
2–30
Rev 02; February 8, 2002
HBLANK
Video
Stripped
HSYNC
memory write enable
(valid video window)
HOFF
Active
Offset
HACT
Figure 2–28. PWG Horizontal Window Timing
In Figure 2–28, HACT and HOFF are programmed to load the entire video region. The falling edge of stripped
Hsync starts the horizontal counter. HOFF is programmed to the desired horizontal offset. This is a no-load region.
HACT is programmed to the total horizontal line time. At the end of the HACT count (end of active period) the FIFO
load is disabled and the horizontal counter resets and waits for the next stripped Hsync.
Figure 2–29 illustrates HACT and HOFF programmed to crop the incoming video in the horizontal direction, creat-
ing and AOI (PLL mode is illustrated).
HBLANK
Stripped
HSYNC
memory write enable
(valid video window)
H Offset
H-Active
HOFF
HACT
Figure 2–29. PWG Horizontal Timing with Cropping
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