User guide

Chapter 11: Clocked Video Output MegaCore Function 11–17
Signals
January 2013 Altera Corporation Video and Image Processing Suite
User Guide
vcoclk_div Out
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 that a PLL can use to synchronize its output clock.
vid_data Out Clocked video data bus. This bus transfers video data into the MegaCore function.
vid_datavalid Out
(Separate Synchronization mode Only.) Clocked video data valid signal. This signal
is asserted when an active picture sample of video data is present on
vid_data .
vid_f Out
(Separate Synchronization Mode Only.) Clocked video field signal. For interlaced
input, this signal distinguishes between field 0 and field 1. For progressive video,
this signal is unused.
vid_h Out
(Separate Synchronization Mode Only.) Clocked video horizontal blanking signal.
This signal is asserted during the horizontal blanking period of the video stream.
vid_h_sync Out
(Separate Synchronization Mode Only.) Clocked video horizontal synchronization
signal. This signal is asserted during the horizontal synchronization period of the
video stream.
vid_ln Out
(Embedded Synchronization Mode Only.) Clocked video line number signal. Used
with the SDI MegaCore function to indicate the current line number when the
vid_trs signal is asserted.
vid_mode_change Out
Clocked video mode change signal. This signal is asserted on the cycle before a
mode change occurs.
vid_sof Out
Start of frame signal. A rising edge (0 to 1) indicates the start of the video frame as
configured by the SOF registers.
vid_sof_locked Out
Start of frame locked signal. When high the
vid_sof signal is valid and can be
used.
vid_std Out
Video standard bus. Can be connected to the
tx_std signal of the SDI MegaCore
function (or any other interface) to set the
Standard register.
vid_trs Out
(Embedded Synchronization Mode Only.) Clocked video time reference signal (TRS)
signal. Used with the SDI MegaCore function to indicate a TRS, when asserted.
vid_v Out
(Separate Synchronization Mode Only.) Clocked video vertical blanking signal. This
signal is asserted during the vertical blanking period of the video stream.
vid_v_sync Out
(Separate Synchronization Mode Only.) Clocked video vertical synchronization
signal. This signal is asserted during the vertical synchronization period of the video
stream.
Note to Table 11–7:
(1) These ports are present only if you turn on Use control port.
Table 11–7. Clocked Video Output Signals (Part 2 of 2)
Signal Direction Description