
Signal Direction Description
is_eop Input dout port Avalon-ST endofpacket signal. This signal is
asserted when the downstream device is ending a frame.
is_ready Output dout port Avalon-ST ready signal. This signal is asserted
when the IP core function is able to receive data.
is_sop Input dout port Avalon-ST startofpacket signal. Assert this
signal when the downstream device is starting a new
frame.
is_valid Input dout port Avalon-ST valid signal. Assert this signal when
the downstream device produces data.
underflow Output Clocked video underflow signal. A signal corresponding to
the underflow sticky bit of the Status register synchron‐
ized to vid_clk. This signal is for information only and
no action is required if it is asserted.
Note: Present only if you turn on Use control port.
vcoclk_div Output A divided down version of vid_clk (vcoclk). Setting the
Vcoclk Divider register to be the number of samples in a
line produces a horizontal reference on this signal. A PLL
uses this horizontal reference to synchronize its output
clock.
sof Input Start of frame signal. A rising edge (0 to 1) indicates the
start of the video frame as configured by the SOF registers.
Connecting this signal to a CVI IP core allows the output
video to be synchronized to this signal.
sof_locked Output Start of frame locked signal. When asserted, the sof signal
is valid and can be used.
status_update_int Output control slave port Avalon-MM interrupt signal. When
asserted, the status registers of the IP core have been
updated and the master must read them to determine
what has occurred.
Note: Present only if you turn on Use control port.
vid_clk Input Clocked video clock. All the video output signals are
synchronous to this clock.
vid_data Output Clocked video data bus. This bus transfers video data into
the IP core.
vid_datavalid Output Clocked video data valid signal. Assert this signal when a
valid sample of video data is present on vid_data.
4-32
Clocked Video Interface Signals
UG-VIPSUITE
2015.05.04
Altera Corporation
Clocked Video Interface IP Cores
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