
Table 4-19: Clocked Video Output II Signals
Signal Direction Description
main_reset_reset Input The IP core asynchronously resets when you assert this
signal. You must deassert this signal synchronously to the
rising edge of the clock signal.
main_clock_clk Input The main system clock. The IP core operates on the rising
edge of this signal.
din_data Input din port Avalon-ST data bus. This bus enables the
transfer of pixel data into the IP core.
din_endofpacket Input dout port Avalon-ST endofpacket signal. This signal is
asserted when the downstream device is ending a frame.
din_ready Output din port Avalon-ST ready signal. This signal is asserted
when the IP core function is able to receive data.
din_startofpacket Input din port Avalon-ST startofpacket signal. Assert this
signal when the downstream device is starting a new
frame.
din_valid Input din port Avalon-ST valid signal. Assert this signal when
the downstream device produces data.
din_empty Input
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.
4-34
Clocked Video Interface Signals
UG-VIPSUITE
2015.05.04
Altera Corporation
Clocked Video Interface IP Cores
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