User guide

19–2 Chapter 19: Gamma Corrector MegaCore Function
Parameter Settings
Video and Image Processing Suite January 2013 Altera Corporation
User Guide
Error Recovery
The Gamma Corrector MegaCore function processes video packets until an
endofpacket signal is received. Non-image packets are propagated but the content of
control packets is ignored. For this MegaCore function there is no such condition as an
early or late endofpacket. Any mismatch of the
endofpacket signal and the frame size
is propagated unchanged to the next MegaCore function.
1 For more information about the stall behavior and error recovery, refer to “Stall
Behavior and Error Recovery” on page 1–3.
Latency
Table 19–2 lists the approximate latency from the video data input to the video data
output for typical usage modes of the Gamma Corrector 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 19–3 lists the Gamma Corrector MegaCore function parameters.
Table 19–2. Gamma Corrector Latency
Mode Latency
All modes O (cycles)
(1)
Note to Table 19–2:
(1) O refers to a small number of clock cycles, and is not of zero value.
Table 19–3. Gamma Corrector Parameter Settings
Parameter Value Description
Bits per pixel
per color plane
4–16, Default = 8 Choose the number of bits per pixel (per color plane).
Number of
color planes
1–3, Default = 3
The number of color planes that are sent in sequence or parallel over one
data connection.
Color plane
transmission
format
Color planes in sequence,
Color planes in parallel
Specifies whether the specified number of color planes are transmitted in
sequence or in parallel. For example, a value of 3 planes in sequence for
R'G'B' R'G'B' R'G'B'.