UG-VIPSUITE |
Avalon-ST Video Protocol |
2-7 |
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2015.01.23 |
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Figure 2-6: Separate Synchronization Signals Timing Diagram
vid_data |
D0 |
D1 |
DN |
Dn+1 Dn+2 |
vid_de/vid_datavalid (1)
vid_v_sync
vid_h_sync
vid_f
(1): vid_datavalid: Clocked Video Output IP core vid_de: Clocked Video Input IP core
The CVI IP cores only read the vid_data, vid_de, vid_h_sync, vid_v_sync, and vid_f signals when vid_datavalid is 1. This allows the CVI IP cores to support oversampling where the video clock is running at a higher rate than the pixel clock.
Video Locked Signal
The vid_locked signal indicates that the clocked video stream is active. When the signal has a value of 1, the CVI IP cores take the input clocked video signals as valid, and read and process them as normal. When the signal has a value of 0 (if for example the video cable is disconnected or the video interface is not receiving a signal):
•Clocked Video Input IP core: The IP core takes the input clocked video signals as invalid and do not process them.
•Clocked Video Input II IP core: The vid_clk domain registers of the IP core are held in reset and no video is processed. The control and Avalon-ST Video interfaces are not held in reset and will respond as normal. The vid_locked signal is synchronized internally to the IP core and is asynchronous to the
vid_clk.
If the vid_locked signal goes invalid while a frame of video is being processed, the CVI IP cores end the frame of video early.
Avalon-ST Video Protocol
The Avalon-ST Video protocol is a packet-oriented way to send video and control data over Avalon-ST connections. The IP cores in the Video and Image Processing Suite use the Avalon-ST Video protocol.
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.
Interfaces |
Altera Corporation |
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Send Feedback
2-8 |
Avalon-ST Video Protocol |
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UG-VIPSUITE |
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2015.01.23 |
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Table 2-3: Avalon-ST Video Protocol Parameters |
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Parameter Values |
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IP Cores |
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Frame Width/ |
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Interlaced/ |
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Bits per Color |
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Color Pattern |
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Height |
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Progressive |
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Sample |
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2D FIR Filter |
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User-defined— |
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Progressive |
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User-defined— |
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One, two, or three |
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through |
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through |
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channels in sequence. |
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parameter editor |
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parameter editor |
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Alpha Blending Mixer |
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Run-time |
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Progressive |
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User-defined— |
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• din and dout: One, |
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controlled |
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through |
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two or three |
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parameter editor |
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channels in |
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Specified |
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sequence |
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separately for |
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• alpha_in: A single |
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image data and |
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color plane |
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alpha blending. |
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representing the |
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alpha value for each |
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pixel |
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Mixer II |
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No run-time |
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Progressive |
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User-defined— |
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Two or three channels |
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control |
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through |
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in parallel. |
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parameter editor |
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Chroma Resampler |
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Run-time |
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Progressive |
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User-defined— |
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User-defined—through |
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controlled |
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through |
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parameter editor |
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parameter editor |
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Clipper/Clipper II |
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Run-time |
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Either one— |
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User-defined— |
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Any combination of |
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controlled |
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interlaced inputs |
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through |
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one, two, three, or four |
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are accepted but |
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parameter editor |
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channels in each of |
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treated as |
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sequence or parallel. |
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progressive |
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inputs. |
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Color Plane Sequencer |
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Run-time |
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Either one |
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User-defined— |
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User-defined—through |
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controlled |
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through |
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parameter editor |
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parameter editor |
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Color Space Converter |
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Run-time |
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Either one |
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User-defined— |
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Three color planes in |
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controlled |
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through |
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parallel or sequence |
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parameter editor |
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Color Space Converter |
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No run-time |
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Either one |
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User-defined— |
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Three color planes in |
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II |
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control |
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through |
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parallel or sequence |
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parameter editor |
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Control Synchronizer |
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Run-time |
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Run-time |
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User-defined— |
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Up to four color planes |
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controlled |
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controlled |
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through |
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in parallel, with any |
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parameter editor |
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number of color planes |
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in sequence. |
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Altera Corporation |
Interfaces |
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Send Feedback
UG-VIPSUITE |
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Avalon-ST Video Protocol |
2-9 |
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2015.01.23 |
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Parameter Values |
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IP Cores |
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Frame Width/ |
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Interlaced/ |
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Bits per Color |
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Color Pattern |
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Height |
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Progressive |
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Sample |
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Deinterlacer |
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Run-time |
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Interlaced input |
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User-defined— |
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• One, two, or three |
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controlled |
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and progressive |
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through |
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channels in |
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output (plus |
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parameter editor |
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sequence |
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optional |
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• alpha_in: A single |
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passthrough |
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color plane |
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mode for |
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representing the |
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progressive |
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alpha value for each |
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input) |
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pixel |
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Deinterlacer II |
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Run-time |
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Interlaced input |
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User-defined— |
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Any combination of |
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controlled |
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and progressive |
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through |
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two or three channels |
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output (plus |
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parameter editor |
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in each of parallel. |
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passthrough |
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mode for |
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progressive |
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input) |
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Broadcast Deinterlacer |
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Run-time |
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Interlaced input |
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User-defined— |
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Two channels in |
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controlled |
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and progressive |
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through |
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parallel (4:2:2 only) |
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output (plus |
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parameter editor |
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passthrough |
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mode for |
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progressive |
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input) |
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Frame Reader |
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User-defined— |
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User-defined— |
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User-defined— |
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Up to four color planes |
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through Avalon- |
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through Avalon- |
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through |
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in parallel, with up to |
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MM slave |
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MM slave |
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parameter editor |
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three color planes in |
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control port |
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control port |
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sequence. |
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Frame Buffer |
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Run-time |
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Progressive; in |
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User-defined— |
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Any combination of |
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controlled |
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some cases |
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through |
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one, two, three, or four |
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interlaced data |
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parameter editor |
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channels in each of |
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accepted |
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sequence or parallel. |
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Frame Buffer II |
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No run-time |
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Progressive |
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User-defined— |
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Any combination of |
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control |
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inputs only |
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through |
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one, two, three, or four |
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parameter editor |
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channels in each of |
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parallel. |
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Gamma Corrector |
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Run-time |
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Either one |
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User-defined— |
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One, two or three |
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controlled |
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through |
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channels in sequence |
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parameter editor |
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or parallel. |
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Interfaces |
Altera Corporation |
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Send Feedback
2-10 |
Avalon-ST Video Protocol |
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UG-VIPSUITE |
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2015.01.23 |
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Parameter Values |
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IP Cores |
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Frame Width/ |
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Interlaced/ |
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Bits per Color |
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Color Pattern |
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Height |
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Progressive |
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Sample |
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Interlacer |
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Run-time |
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Progressive; |
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User-defined— |
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One, two or three |
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controlled |
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interlaced data is |
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through |
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channels in sequence |
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either discarded |
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parameter editor |
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or parallel. |
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or propagated |
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without change |
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in parameter |
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editor |
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Test Pattern Generator |
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User-defined— |
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User-defined— |
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User-defined— |
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One, two or three |
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through |
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through |
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through |
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channels in sequence |
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parameter editor |
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parameter editor |
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parameter editor |
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or parallel. |
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or run-time |
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controlled |
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Test Pattern Generator |
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User-defined— |
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User-defined— |
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User-defined— |
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RGB 4:4:4 or YCbCr |
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II |
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through |
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through |
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through |
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4:4:4, 4:2:2 or 4:2:0 in |
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parameter editor |
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parameter editor |
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parameter editor |
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parallel or sequence. |
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or run-time |
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controlled |
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Packets
The packets of the Avalon-ST Video protocol are split into symbols—each symbol represents a single piece of data. 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
Another seven packet types are 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.
Table 2-4: Avalon-ST Video Packet Types
Type Identifier |
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Description |
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0 |
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Video data packet |
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1–8 |
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User packet types |
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9–12 |
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Reserved for future Altera use |
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Altera Corporation |
Interfaces |
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Send Feedback