User guide
Table Of Contents
- Contents
- 1. About This MegaCore Function Suite
- Release Information
- Device Family Support
- Features
- Design Example
- Performance and Resource Utilization
- 2D FIR Filter
- 2D Median Filter
- Alpha Blending Mixer
- Avalon-ST Video Monitor
- Chroma Resampler
- Clipper
- Clocked Video Input
- Clocked Video Output
- Color Plane Sequencer
- Color Space Converter
- Control Synchronizer
- Deinterlacer
- Deinterlacer II
- Frame Buffer
- Gamma Corrector
- Interlacer
- Scaler
- Scaler II
- Switch
- Test Pattern Generator
- Trace System
- 2. Getting Started with Altera IP Cores
- 3. Interfaces
- Interface Types
- Avalon-ST Video Protocol
- Avalon-MM Slave Interfaces
- Avalon-MM Master Interfaces
- Buffering of Non-Image Data Packets in Memory
- 4. 2D FIR Filter MegaCore Function
- 5. 2D Median Filter MegaCore Function
- 6. Alpha Blending MegaCore Function
- 7. Avalon-ST Video Monitor MegaCore Function
- 8. Chroma Resampler MegaCore Function
- 9. Clipper MegaCore Function
- 10. Clocked Video Input MegaCore Function
- 11. Clocked Video Output MegaCore Function
- 12. Color Plane Sequencer MegaCore Function
- 13. Color Space Converter MegaCore Function
- 14. Control Synchronizer MegaCore Function
- 15. Deinterlacer MegaCore Function
- Core Overview
- Functional Description
- Parameter Settings
- Signals
- Control Register Maps
- 16. Deinterlacer II MegaCore Function
- 17. Frame Reader MegaCore Function
- 18. Frame Buffer MegaCore Function
- 19. Gamma Corrector MegaCore Function
- 20. Interlacer MegaCore Function
- 21. Scaler MegaCore Function
- 22. Scaler II MegaCore Function
- 23. Switch MegaCore Function
- 24. Test Pattern Generator MegaCore Function
- 25. Trace System MegaCore Function
- A. Avalon-ST Video Verification IP Suite
- B. Choosing the Correct Deinterlacer
- Additional Information
3–2 Chapter 3: Interfaces
Avalon-ST Video Protocol
Video and Image Processing Suite January 2013 Altera Corporation
User Guide
1 For information about the supported clocked video interfaces, refer to the “Functional
Description” sections of “Clocked Video Input MegaCore Function” on page 10–1 and
“Clocked Video Output MegaCore Function” on page 11–1.
Avalon-ST Video Protocol
The MegaCore functions in the Video and Image Processing Suite use the Avalon-ST
Video protocol. The Avalon-ST Video protocol is a packet-oriented way to send video
and control data over Avalon-ST connections. Using the Avalon-ST Video protocol
allows the construction of image processing data paths which automatically configure
to changes in the format of the video being processed. This minimizes the external
control logic required to configure a video system.
Packets
The packets of the Avalon-ST Video protocol are split into symbols, where each
symbol represents a single piece of data (see the Avalon Interface Specifications). For all
packet types on a particular Avalon-ST interface the number of symbols sent in
parallel (that is, on one clock cycle) and the bit width of all symbols is fixed. The
symbol bit width and number of symbols sent in parallel defines the structure of the
packets.
The functions predefine the following three types of packet:
■ Video data packets containing only uncompressed video data
■ Control data packets containing the control data configure the cores for incoming
video data packets
■ Ancillary (non-video) data packets containing ancillary packets from the vertical
blanking period of a video frame.
There are also seven packet types reserved for users, and five packet types reserved
for future definition by Altera.
The packet type is defined by a 4-bit packet type identifier. This type identifier is the
first value of any packet. It is the symbol in the least significant bits of the interface.
Functions do not use any symbols in parallel with the type identifier (assigned X as
shown in Figure 3–2).