User guide

21–14 Chapter 21: Scaler MegaCore Function
Signals
Video and Image Processing Suite January 2013 Altera Corporation
User Guide
Signals
Table 21–7 lists the input and output signals for the Scaler MegaCore function.
Table 21–7. Scaler 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.
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.
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.
Note to Table 21–7:
(1) These ports are present only if you turn on Run-time control of image size.