User guide

Chapter 10: Clocked Video Input MegaCore Function 10–9
Parameter Settings
January 2013 Altera Corporation Video and Image Processing Suite
User Guide
Latency
Table 10–7 lists the approximate latency from the video data input to the video data
output for typical usage modes of the Clocked Video Input MegaCore function. You
can use this table to predict the approximate latency between the input and the output
of your video processing pipeline.
The latency is described using one or more of the following measures:
■ the number of progressive frames
■ the number of interlaced fields
■ the number of lines when less than a field of latency
■ a small number of cycles O (cycles)
The latency is measured with the assumption that the MegaCore function is not being
stalled by other functions on the data path (the output ready signal is high).
1 The latency associated with the initial buffering phase, when a MegaCore function
first receives video data, is not included.
Parameter Settings
Table 10–8 lists the Clocked Video Input MegaCore function parameters.
Table 10–7. Clocked Video Input Latency
Mode Latency
(1)
Synchronization signals: Embedded in video
Video in and out use the same clock: On
8 cycles
Synchronization signals: On separate wires
Video in and out use the same clock: On
5 cycles
Note to Table 10–7:
(1) Add 1 cycle if Allow color planes in sequence input is turned on.
Table 10–8. Clocked Video Input Parameter Settings (Part 1 of 2)
Parameter Value Description
Select preset to load
DVI 1080p60,
SDI 1080p60,
SDI 1080i60,
PAL, NTSC
You can choose from a list of preset conversions or use the other fields in
the dialog box to set up custom parameter values. If you click Load values
into controls the dialog box is initialized with values for the selected preset
conversion.
Bits per pixel per color
plane
4–20, Default = 8 Choose the number of bits per pixel (per color plane).
Number of color planes 1–4, Default = 3 Choose the number of color planes.
Color plane transmission
format
Sequence, Parallel
Choose whether the color planes are transmitted in sequence or in
parallel.
Field order
Field 0 first,
Field 1 first,
Any field first,
Choose the field to synchronize to first when starting or stopping the
output.