IPSR-VIDEO Altera, IPSR-VIDEO Datasheet - Page 62

• 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

4–4
Video and Image Processing Suite User Guide
1
1
Bits Per Pixel Per Color Plane
The maximum number of bits that represent each color plane value within each pixel.
For example R’G’B’ data of eight bits per sample (24 bits per pixel) would use eight
bits per pixel per color plane.
This parameter also defines the bit width of symbols for all packet types on a
particular Avalon-ST interface. An Avalon-ST interface must be at least four bits wide
to fully support the Avalon-ST Video protocol.
Color Pattern
The organization of the color plane samples within a video data packet is referred to
as the color pattern. This color pattern cannot change within a video data packet.
A color pattern is represented as a matrix which defines a repeating pattern of color
plane samples that make up a pixel (or multiple pixels). The height of the matrix
indicates the number of color plane samples transmitted in parallel, the width
determines how many cycles of data are transmitted before the pattern repeats.
Each color plane sample in the color pattern maps to an Avalon-ST symbol. The
mapping is such that color plane samples on the left of the color pattern matrix are the
symbols transmitted first. Color plane samples on the top are assigned to the symbols
occupying the most significant bits of the Avalon-ST data signal as shown in
Figure
Figure 4–3. Symbol Transmission Order
The number of color plane samples transmitted in parallel (that is, in one clock cycle)
defines the number of symbols transmitted in parallel for all packet types on a
particular Avalon-ST interface.
A color pattern can represent more than one pixel. This is the case when consecutive
pixels contain samples from different color planes—There must always be at least one
common color plane between all pixels in the same color pattern. Color patterns
representing more than one pixel are identifiable by a repeated color plane name. The
number of times a color plane name is repeated is the number of pixels represented.
Figure 4–4
Cr alternate between consecutive pixels.
Figure 4–4. Horizontally Subsampled Y'CbCr
Symbol transmitted last
4–3.
shows two pixels of horizontally subsampled Y' CbCr (4:2:2) where Cb and
Symbol transmitted first
B
G
R
Cb Cr
Y
Y
Symbol in most significant bits
Symbol in least significant bits
January 2011 Altera Corporation
Avalon-ST Video Protocol
Chapter 4: Interfaces
R
G
B