User guide

Chapter 11: Clocked Video Output MegaCore Function 11–3
Functional Description
January 2013 Altera Corporation Video and Image Processing Suite
User Guide
Embedded Synchronization Format
For the embedded synchronization format, the MegaCore function inserts the
horizontal and vertical syncs and field into the data stream during the horizontal
blanking period (Table 10–1 on page 10–2).
A sample is output for each clock cycle on the
vid_data bus.
There are two extra signals that are only used when connecting to the SDI MegaCore
function. They are
vid_trs , which is high during the 3FF sample of the TRS, and
vid_ln , which outputs the current SDI line number. These are used by the SDI
MegaCore function to insert line numbers and cyclical redundancy checks (CRC) into
the SDI stream as specified in the 1.5 Gbps HD SDI and 3 Gbps SDI standards.
The Clocked Video Output MegaCore inserts any ancillary packets (packets with a
type of 13 or 0xD) into the output video during the vertical blanking. For information
about Avalon-ST Video ancillary data packets, refer to “Ancillary Data Packets” on
page 3–10. The Clocked Video Output MegaCore begins inserting the packets on the
lines specified in its parameters or mode registers (ModeN Ancillary Line and ModeN
F0 Ancillary Line). The Clocked Video Output MegaCore stops inserting the packets
at the end of the vertical blanking.
Figure 11–2. Interlaced Frame Format
Vertical Blanking
F0 Active Picture
Horizontal Blanking
Horizontal Sync
Vertical Sync
F0 Vertical Blanking
F1 Active Picture
Width
Height
Width
Height
Field