IPSR-VIDEO Altera, IPSR-VIDEO Datasheet - Page 151

• 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
Stall Behavior and Error Recovery
January 2011 Altera Corporation
Frame Buffer
1
Select the weave algorithm, so that the MegaCore function stalls for longer than the
usual periods between each output row of the image. Stalls of up to 45 clock cycles are
possible due to the time taken for internal processing in between lines.
Select the motion-adaptive algorithm, so that stalls up to 90 clock cycles are possible.
Select double or triple-buffering, so that external memory decouples data input and
output. The MegaCore function writes non-image data packets into memory by
predeclaring transfers of fixed size. The function cannot interrupt memory
transactions immediately when it receives an endofpacket signal.
For each non-image data packet received, the number of words written into memory
always corresponds to the maximum packet size defined in the parameter editor.
Consequently, the Deinterlacer MegaCore function does not handle control packets
efficiently when large user-defined packets are used. This does not apply when
reading non-image packets back from the external memory because the size of each
incoming packet is registered after it has been determined.
When buffering is used with bob deinterlacing and fields are being discarded, they
are discarded at the input rather than being buffered through external RAM and then
discarded. This reduces the external RAM bandwidth requirement of the Deinterlacer
in these modes.
Error Recovery
An error condition occurs if an endofpacket signal is received too early or too late
relative to the field dimensions contained in the last control packet processed. In all its
configurations, the Deinterlacer discards extra data if the endofpacket signal is
received too late.
If an early endofpacket signal is received when the Deinterlacer is configured for no
buffering, the MegaCore function interrupts its processing within one or two lines
sending undefined pixels, before propagating the endofpacket signal.
If an early endofpacket signal is received when the Deinterlacer is configured to
buffer data in external memory, the input side of the MegaCore function stops
processing input pixels. It is then ready to process the next frame after writing
undefined pixels for the remainder of the current line into external RAM. The output
side of the Deinterlacer assumes that incomplete fields have been fully received and
pads the incomplete fields to build a frame, using the undefined content of the
memory.
The Frame Buffer MegaCore function may stall frequently and read or write less than
once per clock cycle during control packet processing. During data processing at the
input or at the output, the stall behavior of the Frame Buffer is largely decided by
contention on the memory bus.
Video and Image Processing Suite User Guide
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