IPSR-VIDEO Altera, IPSR-VIDEO Datasheet - Page 107

• Manufacturer Part Number: IPSR-VIDEO
• Description: RENEWAL Of IPS-VIDEO
• Manufacturer: Altera
• Series: IP Suitesr

Specifications of IPSR-VIDEO

• Software Application: IP CORE, SUITES
• Supported Families: Arria GX, Cyclone II, HardCopy II, Stratix II
• Features: Common Avalon Streaming (Avalon-St) Interface And Avalon-St Video Protocol
• Core Architecture: FPGA
• Core Sub-architecture: Arria, Cyclone, Stratix
• Rohs Compliant: NA
• Lead Free Status / RoHS Status: na

Chapter 5: Functional Descriptions
Clocked Video Output
January 2011 Altera Corporation
The Clocked Video Output MegaCore function can take in the SOF signal from a
Clocked Video Input MegaCore function and align its own SOF to this signal. The
Clocked Video Output SOF signal can be set to any position within the outgoing
video frame. The registers used to configure the SOF signal are measured from the
rising edge of the F0 vertical sync. A start of frame is indicated by a rising edge on the
SOF signal (0 to 1).
Figure 5–12
two SOF signals to determine how far apart they are.
Figure 5–12. Aligning the Output Video to the Incoming SOF
The Clocked Video Output MegaCore function then repeats or removes that number
of samples and lines in the output video to align the two SOF signals. If the SOF
signals are separated by less than a threshold number of samples (the value of the
Vcoclk Divider register), the Clocked Video Output does not alter the output video.
If your PFD clock tracking has a delay associated with it, Altera recommends that
even if the vcoclk_div signal is not being used, the Vcoclk Divider register should be
set to a threshold value e.g. 1. This stops the Clocked Video Output MegaCore
function from re-syncing every time a delay in clock tracking causes the SOF signals
to drift out by a clock cycle.
The current distance between the SOF signals is stored internally and when either the
repeat registers or the remove registers read 0 then the locked interrupt triggers.
shows how the Clocked Video Output MegaCore function compares the
remove_lines
repeat_lines
Figure 5–9 on page 5–20
cvo_sof
vid_sof
sof
sof
5
shows an example configuration.
Repeat 3 lines
3
Video and Image Processing Suite User Guide
5–27