User guide

Chapter 9: Clipper MegaCore Function 9–3
Signals
January 2013 Altera Corporation Video and Image Processing Suite
User Guide
Signals
Table 9–4 lists the input and output signals for the Clipper MegaCore function.
Number of color
planes in parallel
1–3 Choose the number of color planes in parallel.
Include Avalon-MM
interface
On or Off
Turn on if you want to specify clipping offsets using the Avalon-MM
interface.
Clipping method Offsets, Rectangle
Choose whether to specify the clipping area as offsets from the edge of
the input area or as a fixed rectangle.
Left offset positive integer, Default = 10
Specify the x coordinate for the left edge of the clipping rectangle. 0 is
the left edge of the input area.
(1)
Right offset positive integer, Default = 10
Specify the x coordinate for the right edge of the clipping rectangle. 0
is the right edge of the input area.
(1)
Width positive integer, Default = 10 Specify the width of the clipping rectangle.
Top offset positive integer, Default = 10
Specify the y coordinate for the top edge of the clipping rectangle. 0 is
the top edge of the input area.
(2)
Bottom offset positive integer, Default = 10
Specify the y coordinate for the bottom edge of the clipping rectangle.
0 is the bottom edge of the input area.
(2)
Height positive integer, Default = 10 Specify the height of the clipping rectangle.
Notes to Table 9–3:
(1) The left and right offset values must be less than or equal to the input image width.
(2) The top and bottom offset values must be less than or equal to the input image height.
Table 9–3. Clipper Parameter Settings (Part 2 of 2)
Parameter Value Description
Table 9–4. Clipper Signals (Part 1 of 2)
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.
control_av_address In
control slave port Avalon-MM address bus. Specifies a word offset into
the slave address space.
(1)
control_av_chipselect In
control slave port Avalon-MM chipselect signal. The control port
ignores all other signals unless you assert this signal.
(1)
control_av_readdata Out
control slave port Avalon-MM readdata bus. These output lines are used
for read transfers.
(1)
control_av_waitrequest Out control slave port Avalon-MM waitrequest signal.
(1)
control_av_write In
control slave port Avalon-MM write signal. When you assert this signal,
the
control port accepts new data from the writedata bus.
(1)
control_av_writedata In
control slave port Avalon-MM writedata bus. These input lines are used
for write transfers.
(1)
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.