User guide

8–6 Chapter 8: Chroma Resampler MegaCore Function
Signals
Video and Image Processing Suite January 2013 Altera Corporation
User Guide
Signals
Table 8–4 lists the input and output signals for the Chroma Resampler MegaCore
function.
Color plane
configuration
Sequence, Parallel
There must always be three color planes for this function but you can
choose whether the three color planes are transmitted in sequence or in
parallel.
Input Format
(1)
4:4:4, 4:2:2, 4:2:0
Choose the format/sampling rate format for the input frames. Note that the
input and output formats must be different.
Output Format
(1)
4:4:4, 4:2:2, 4:2:0
Choose the format/sampling rate format for the output frames. Note that
the input and output formats must be different.
Horizontal Filtering
Algorithm
Filtered,
Nearest Neighbor
Choose the algorithm to use in the horizontal direction when re-sampling
data to or from 4:4:4.
Luma adaptive On or Off
Turn on to enable luma-adaptive mode. This mode looks at the luma
channel during interpolation and uses this to detect edges.
Note to Table 8–3:
(1) The input and output formats must be different. A warning is issued when the same values are selected for both.
Table 8–3. Chroma Resampler Parameter Settings (Part 2 of 2)
Parameter Value Description
Table 8–4. Chroma Resampler Signals
Signal Direction Description
clock In
The main system clock. The MegaCore function operates on the rising edge of the
clock signal.
reset In
The MegaCore function asynchronously resets when you assert
reset . You must
deassert
reset synchronously to the rising edge of the clock signal.
din_data In
din port Avalon-ST data bus. This bus enables the transfer of pixel data into the
MegaCore function.
din_endofpacket In
din port Avalon-ST endofpacket signal. This signal marks the end of an Avalon-
ST packet.
din_ready Out
din port Avalon-ST ready signal. This signal indicates when the MegaCore
function is ready to receive data.
din_startofpacket In
din port Avalon-ST startofpacket signal. This signal marks the start of an
Avalon-ST packet.
din_valid In
din port Avalon-ST valid signal. This signal identifies the cycles when the port
must input data.
dout_data Out
dout port Avalon-ST data bus. This bus enables the transfer of pixel data out of
the MegaCore function.
dout_endofpacket Out
dout port Avalon-ST endofpacket signal. This signal marks the end of an
Avalon-ST packet.
dout_ready In
dout port Avalon-ST ready signal. The downstream device asserts this signal
when it is able to receive data.
dout_startofpacket Out
dout port Avalon-ST startofpacket signal. This signal marks the start of an
Avalon-ST packet.
dout_valid Out
dout port Avalon-ST valid signal. This signal is asserted when the MegaCore
function outputs data.