User guide

Chapter 19: Gamma Corrector MegaCore Function 19–3
Signals
January 2013 Altera Corporation Video and Image Processing Suite
User Guide
1 You program the actual gamma corrected intensity values at run time using the
Avalon-MM slave interface.
Signals
Table 19–4 lists the input and output signals for the Gamma Corrector MegaCore
function.
Table 19–4. Gamma Corrector 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.
gamma_lut_av_address In
gamma_lut slave port Avalon-MM address . Specifies a word offset into
the slave address space.
gamma_lut_av_chipselect In
gamma_lut slave port Avalon-MM chipselect signal. The gamma_lut
port ignores all other signals unless you assert this signal.
gamma_lut_av_readdata Out
gamma_lut slave port Avalon-MM readdata bus. These output lines are
used for read transfers.
gamma_lut_av_write In
gamma_lut slave port Avalon-MM write signal. When you assert this
signal, the
gamma_lut port accepts new data from the writedata bus.
gamma_lut_av_writedata In
gamma_lut slave port Avalon-MM writedata bus. These input lines are
used for write transfers.