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Chapter 5: Functional Descriptions
Clocked Video Output
5–47
The MegaCore function can be configured to support between 1 to 14 different modes
and each mode has a bank of registers that describe the output frame. When the
MegaCore function receives a new control packet on the Avalon-ST Video input, it
searches the mode registers for a mode that is valid and has a field width and height
that matches the width and height in the control packet. The register Video Mode
Match shows the selected mode. When found, it restarts the video output with those
format settings. If a matching mode is not found, the video output format is
unchanged and a restart does not occur.
Figure 5–17 shows how the register values map to the progressive frame format
described in “Video Formats” on page 5–43.
Figure 5–17. Progressive Frame Parameters
F0 active picture
V front
porch
V sync
V back
porch
Ancillary line
H front H H back
porch sync porch
V blanking
Active lines
Active
picture line
Active samples
H blanking
July 2010 Altera Corporation
Video and Image Processing Suite User Guide