Xilinx LogiCORE IP Video In to AXI4-Stream v1.0 Скачать руководство пользователя страница 13

Страница: 13 / 32

Video In to AXI4-Stream

www.xilinx.com

PG043 April 24, 2012

Product Specification

Core Interfaces and Register Space

AXI4-Stream Interface

AXI4-Stream Signal Names and Descriptions

Table 2-10

describes the AXI4-Stream signal names and descriptions.

The

ACLK

ACLKEN

and

ARESETn

signals are shared between the core, the AXI4-Stream

data interfaces, and AXI4-Lite control interfaces in the system.

ACLK

The AXI4-Stream must be synchronous to the clock signal

ACLK

. AXI4-Stream signals are

sampled on the rising edge of

ACLK

. AXI4-Stream output signal changes occur after the

rising edge of

ACLK

ACLKEN

The

ACLKEN

pin is an active-high, synchronous clock-enable input pertaining the

AXI4-Stream interface. Setting

ACLKEN

low (de-asserted) halts the operation of the

AXI4-Stream Bus despite 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

ARESETn

, which supersedes

ACLKEN

ARESETn

The

ARESETn

pin is an active-low, synchronous reset input.

ARESETn

supersedes

ACLKEN

and when set to 0, the core resets even if

ACLKEN

is de-asserted.

Video Data

The AXI4-Stream interface specification restricts

TDATA

widths to integer multiples of

8 bits. Therefore, in the case of data with 10 or 12 bits, data must be padded with zeros on

Table 2-10:

AXI4-Stream Data Interface Signal Descriptions

Signal Name

Direction

Width

Description

m_axis_video_tdata

Out

8 to 64

Output Video Data

m_axis_video_tvalid

Out

Output Valid

m_axis_video_tready

Output Ready

m_axis_video_tuser

Out

Output Video Start Of Frame

m_axis_video_tlast

Out

Output Video End Of Line

ACLK

Clock

ACLKEN

Clock Enable

ARESETn

Active low synchronous

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...

Результаты поиска

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

Отзывы:

Похожие инструкции для LogiCORE IP Video In to AXI4-Stream v1.0

Бренды по названию

Популярные бренды

Xilinx LogiCORE IP Video In to AXI4-Stream v1.0, Руководство по эксплуатации продукта

Результаты поиска

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

Отзывы:

Похожие инструкции для LogiCORE IP Video In to AXI4-Stream v1.0

Бренды по названию

Популярные бренды