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Video In to AXI4-Stream

www.xilinx.com

PG043 April 24, 2012

Chapter 1

Overview

Many Xilinx video processing cores utilize the AXI-4 Stream video protocol to transfer video

between cores. Between systems, video is commonly transmitted with explicit blanking and

sync signals for horizontal and vertical timing, and a data valid signal. DVI is an example of

such a transmission mode. The Video In to AXI4-Stream core converts incoming video with

explicit sync and timing to the AXI4-Stream Video protocol in order to interface to Xilinx

video processing cores that use this protocol.

The Video In to AXI-4 Stream core accepts video inputs. For the purposes of this document,

video is defined as parallel video data along with a pixel clock and one of the following sets

of timing signals:

• Vsync, Hsync, and DE
• Vblank, Hblank, and DE
• Vsync, Hsync, Vbank, Hblank, and DE

Any of these sets of signals is sufficient for the operation of the Video In to AXI4-Stream

core. The particular choice is important to the VTC detector, so the generation of the VTC

core should specify which set of timing signals will be used. The output side of the core is

an AXI4-Stream interface in master mode. This interface consists of parallel video data,

tdata

, handshaking signals

tvalid

and

tready

, and two flags,

tlast

and

tuser

which

serve to identify certain pixels in the video stream. The flag

tlast

designates the last valid

pixel of each line, and is also known as the end of line (EOL). The flag

tuser

designates the

first valid pixel of a frame, and is known as start of frame (SOF). These two flags are

necessary to identify pixel locations on the AXI4 stream bus because there are no sync or

blank signals. Only active pixel are carried on the bus. The

Video IP: AXI Feature Adoption

section of the

UG761 AXI Reference Guide

describes the video over AXI4 Stream Video

protocol in detail.

Содержание LogiCORE IP Video In to AXI4-Stream v1.0

Страница 1: ...Video In to AXI4 Stream v1 0 Product Guide PG043 April 24 2012...

Страница 2: ...ion 9 Core Interfaces and Register Space 10 Chapter 3 Customizing and Generating the Core Graphical User Interface GUI 16 Chapter 4 Designing with the Core General Design Guidelines 18 System Consider...

Страница 3: ...il 24 2012 I O Standard and Placement 28 Chapter 6 Detailed Example Design Appendix A Additional Resources Xilinx Resources 30 Solution Centers 30 References 30 Technical Support 31 Ordering Informati...

Страница 4: ...clock boundary crossing between video clock domain and AXI4 Stream clock domain Selectable FIFO depth from 64 8192 locations Selectable input data width of 8 64 bits LogiCORE IP Video In to AXI4 Strea...

Страница 5: ...sync Hsync Vbank Hblank and DE Any of these sets of signals is sufficient for the operation of the Video In to AXI4 Stream core The particular choice is important to the VTC detector so the generation...

Страница 6: ...to the axis_enable input of the Video In to AXI4 Stream core in order to inhibit the AXI4 Stream bus when the video input is missing or unstable Feature Summary The Video In to AXI4 Stream core conver...

Страница 7: ...parallel clocked video sources DVI HDMI Image Sensors Other clocked parallel video sources Licensing The Video In to AXI4 Stream core is provided at no cost with the Xilinx tools Use of it is covered...

Страница 8: ...k frequency can vary The maximum achievable clock frequency and all resource counts can be affected by other tool options additional logic in the FPGA device using a different version of Xilinx tools...

Страница 9: ...O will go empty after the EOL on each line If Faclk is less than Fvclk additional buffering is required The FIFO must be large enough to handle the differential in the rate that pixels are coming in o...

Страница 10: ...Width FIFO Depth LUTs FFs RAM 36 18 Fmax MHz 8 32 83 104 0 0 337 24 1024 120 161 1 0 309 64 8192 221 262 16 1 309 Table 2 3 Virtex 6 Data Width FIFO Depth LUTs FFs RAM 36 18 Fmax MHz 8 32 79 104 0 0 3...

Страница 11: ...el Signaling Interface 6IDEO N TO 8 3TREAM S AXIS VIDEO TDATA S AXIS VIDEO TVALID S AXIS VIDEO TREADY S AXIS VIDEO TLAST M AXIS VIDEO TDATA M AXIS VIDEO TVALID M AXIS VIDEO TREADY M AXIS VIDEO TLAST M...

Страница 12: ...s_video_tdata LOW Table 2 8 Port Name I O Width Description Signal Name Direction Width Description vtd_vsync Out 1 Vertical synch video timing signal vtd_hsync Out 1 Horizontal synch video timing sig...

Страница 13: ...rising edges on the ACLK pin Internal states are maintained and output signal levels are held until ACLKEN is asserted again When ACLKEN is de asserted core AXI4 Stream inputs are not sampled except A...

Страница 14: ...ve that can immediately accept data qualified by m_axis_video_tvalid should pre assert its m_axis_video_tready signal until data is received Alternatively m_axis_video_tready can be registered and dri...

Страница 15: ...Video In to AXI4 Stream www xilinx com 15 PG043 April 24 2012 Product Specification Core Interfaces and Register Space X Ref Target Figure 2 3 Figure 2 3 Use of EOL and SOF Signals...

Страница 16: ...h the CORE Generator GUI This section provides a quick reference to parameters that can be configured at generation time The GUI displays a representation of the IP symbol on the left side and the par...

Страница 17: ...components 1 4 is multiplied by the component width to determine the width of the video data bus v_data In turn this width is rounded up to the nearest factor of 8 to determine the width of the AXI4...

Страница 18: ...ng signals The set of timing signals used should be those required by the VTC detector See the PG016 Video Timing Controller Product Guide for more details For the Video In to AXI4 Stream core the dat...

Страница 19: ...inimum the aclk frequency must be higher than the average pixel rate Resets There are two external resets provided rst which resets the entire core and aresetn which resets the AXI4 Stream interface B...

Страница 20: ...n Fvclk additional buffering is required The FIFO must store enough pixels to supply pixels continuously throughout the active line Additionally due to phasing requirements the horizontal active perio...

Страница 21: ...ing edge of DE however it additionally requires knowledge of the vertical timing to identify the first line This is done using the logical or OR vsync and vblank The falling edge of either of these in...

Страница 22: ...use case of reads when the FIFO is empty It also has pointer inhibiting logic to prevent pointer crossings on underflow and overflow This asynchronous nature of the FIFO presents challenges for the f...

Страница 23: ...the read logic is simple with binary pointers but impractical with gray code pointers Clock Domain Crossing of Pointers The synchronization and handshaking for pointers is shown in detail in Figure 4...

Страница 24: ...states request and acknowledge The request state is when Req and Ack are not equal and acknowledge is when they are equal This sample and hold method with handshaking delays the capture of the pointe...

Страница 25: ...from the FIFO as invalid The data output however will not change Thus when a read occurs to an empty FIFO the invalid flag read_error is set and the read pointer does not increment In this way the EO...

Страница 26: ...tal blanking period At the end of each line the EOL must be flushed through from the FIFO to the output registers This is done so that the downstream core can access the complete line without having t...

Страница 27: ...TS_vid_in_clk PERIOD vid_in_clk 150 MHz HIGH 50 NET aclk TNM_NET aclk TIMESPEC TS_aclk PERIOD aclk 150 MHz HIGH 50 TIMESPEC TS_vid_in_clk_to_aclk FROM vid_in_clk TO aclk TIG TIMESPEC TS_aclk_to_vid_i...

Страница 28: ...e no specific Clock placement requirements for this core Banking There are no specific Banking rules for this core Transceiver Placement There are no Transceiver Placement requirements for this core I...

Страница 29: ...Video In to AXI4 Stream www xilinx com 29 PG043 April 24 2012 Chapter 6 Detailed Example Design No example design is available at the time for the LogiCORE IP Video In to AXI4 Stream v1 0 core...

Страница 30: ...s glossary pdf For a comprehensive listing of Video and Imaging application notes white papers reference designs and related IP cores see the Video and Imaging Resources page at http www xilinx com es...

Страница 31: ...Answer Record that contains the Release Notes and Known Issues list for the core being used The following information is listed for each version of the core New Features Resolved Issues Known Issues O...

Страница 32: ...ult of any action brought by a third party even if such damage or loss was reasonably foreseeable or Xilinx had been advised of the possibility of the same Xilinx assumes no obligation to correct any...

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