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This version (04 Apr 2014 10:42) was approved by DragosB.The Previously approved version (02 Aug 2013 18:17) is available.Diff

ADV7511 Xilinx Evaluation Boards Reference Design

Introduction

The ADV7511 is a 225 MHz High-Definition Multimedia Interface (HDMI®) transmitter. It is part of the Artix-7 AC701, Kintex-7 KC705, Virtex-7 VC707, Zynq ZC702, Zynq ZC706 and the Zynq ZED evaluation boards. This reference design provides the video and audio interface between the FPGA and ADV7511 on board. The video uses a 16bit 422 YCbCr interface (except VC707 which uses 36bit 444 RGB interface) and the audio uses a single bit SPDIF interface.

Supported Carriers

Required Hardware

  • AC701/KC705/VC707/ZC702/ZC706/Zed board.
  • HDMI Monitor.

Required Software

  • Xilinx ISE 14.6 (Programmer (IMPACT) is sufficient for the demo and is available on Webpack).
  • A UART terminal (Tera Term/Hyperterminal), Baud rate 57600 for AC701/KC705/VC707 or 115200 for ZC702/ZC706/Zed.

Running Demo (SDK) Program

To begin, connect an HDMI cable between the board HDMI out and the HDMI monitor. After the hardware setup, turn the power on to the board.

Run the evaluate.bat script. This script uses XMD to program the FPGA with the HDL Reference Design and download the Software Reference Design into the DDR.

Note: The evaluate.bat script assumes that the Xilinx ISE Design Suite 14.6 is installed at this path: C:/Xilinx/14.6. If the installation path on your computer is different please modify the script accordingly.

If programming was successful, you should be seeing messages appear on the terminal as shown in figure below.

Terminal

The reference design contains an example of how to:

  • Initialize the ADV7511 High-Definition Multimedia Interface (HDMI®) transmitter.
  • Check current AVR operating mode and depending on this result set the AV mute state.
  • Display an image and play a sound.

Using the reference design

Functional description

Block Diagram

The reference design consists of two independent pcore modules.

The video part consists of a Xilinx VDMA interface and the ADV7511 video interface. The ADV7511 interface consists of a 16bit YCbCr 422 with separate synchorinzation signals. The VDMA streams frame data to this core. The internal buffers of this pcore are small (1k) and do NOT buffer any frames as such. Additional resources may cause loss of synchronization due to DDR bandwidth requirements. The video core is capable of supporting any formats through a set of parameter registers (given below). The pixel clock is generated internal to the device and must be configured for the correct pixel frequency. It also allows a programmable color pattern for debug purposes. A zero to one transition on the enable bits trigger the corresponding action for HDMI enable and color pattern enable.

The reference design defaults to the 1080p video mode. Users may change the video settings by programming the following registers. The core requires a corresponding pixel clock to generate the video. This clock must be generated externally.

HSYNC count: is the total horizontal pixel clocks of the video, for 1080p this is 2200.
HSYNC width: is the pulse width in pixel clocks, for 1080p this is 44.
HSYNC DE Minimum: is the number of pixel clocks for the start of active video and is the sum of horizontal sync width and back porch, for 1080p this is 192 (44 + 148).
HSYNC DE Maximum: is the number of pixel clocks for the end of active video and is the sum of horizontal sync width, back porch and the active video count, for 1080p this is 2112 (44 + 148 + 1920).

VSYNC count: is the total vertical pixel clocks of the video, for 1080p this is 1125.
VSYNC width: is the pulse width in pixel clocks, for 1080p this is 5.
VSYNC DE Minimum: is the number of pixel clocks for the start of active video and is the sum of vertical sync width and back porch, for 1080p this is 41 (5 + 36).
VSYNC DE Maximum: is the number of pixel clocks for the end of active video and is the sum of vertical sync width, back porch and the active video count, for 1080p this is 1121 (5 + 36 + 1080).

Note that the pixel frequency for 1080p is 148.5MHz.

The reference design reads 24bits of RGB data from DDR and performs color space conversion (RGB to YCbCr) and down sampling (444 to 422). If bypassed, the lower 16bits of DDR data is passed to the HDMI interface as it is.

A color pattern register provides a quick check of any RGB values on the monitor. If enabled, the register data is used as the pixel data for the entire frame.

The audio part consists of a Xilinx DMA interface and the ADV7511 spdif audio interface. The audio clock is derived from the bus clock. A programmable register (see below) controls the division factor. The audio data is read from the DDR as two 16bit words for the left and right channels. It is then transmitted on the SPDIF frame. The sample frequency and format may be controlled using the registers below. The reference design defaults to 48KHz.

Registers

Please refer to the regmap.txt file inside the pcores.

Audio Registers (axi_spdif_tx)

QW Address1 Bits Default Name Description
0x00 23:20 0 mode Sample format 0 to 8 (0-16bit, 8-24bit).
15:8 0 ratio Clock divider for the transmit frequency = bus_clock/(1+ratio).
1 0 txdata Transmit data buffer enable (0x1) or disable (0x0).
0 0 txenable Transmitter enable (0x1) or disable (0x0).
0x01 7:6 0 frequency Sample frequency 0(44.1KHz), 1(48KHz), 2(32KHz) or 3(sample rate converter) (RO).
3 0 gstat Generation status original/commercially pre-recorded data (0x1) or none (0x0) (RO).
2 0 pre-emphasis Pre-emphasis 50/15s (0x1) or none (0x0) (RO).
1 0 copy Copy permitted (0x1) or inhibited (0x0) (RO).
0 0 audio Data format is non-audio (0x1) or audio (0x0) (RO).
1. For AXI-Lite byte addresses, multiply by 4.

Using the Software Reference Design

The Software Reference Design uses the ADV7511 Transmitter Library which is a collection of APIs that provide a consistent interface to ADV7511. The library is a software layer that sits between the application and the TX hardware and it is intended to serve two purposes:

  • Provide the application with a set of APIs that can be used to configure HDMI TX hardware without the need for low-level register access. This makes the application portable across different revisions of the hardware and even across different hardware modules.
  • Provide basic services to aid the application in controlling the TX module, such as interrupt service routine, HDCP high-level control and status information.

The documentation for the library's API can be accessed here: ADV7511 Transmitter API Documentation

The project contains 2 components: the Reference Design files and the ADV7511 Transmitter Library. All the components have to be downloaded from the links provided in the Downloads section.

Software Setup

The HDL Reference Design for each supported Xilinx FPGA board contains a folder called SDK_Workspace which stores the Xilinx SDK project files needed to build the no-OS software and also the .bit files with the HDL design that must be programmed into the FPGA. These are the steps that need to be followed to recreate the software project:

  • Copy the SDK_Workspace folder on your PC. Make sure that the path where it is stored does not contain any spaces.
  • Copy the library file to the SDK_Workspace/sw/lib folder.

Library file

  • Copy the library headers to the SDK_Workspace/sw/inc folder.

Library headers

  • Copy the Reference Design files to the SDK_Workspace/sw/src folder.

ADV7511 Transmitter Library Demo files

  • Open the Xilinx SDK. When the SDK starts it asks for a to provide a folder where to store the workspace. Any folder can be provided.
  • In the SDK select the File→Import menu option to import the software projects into the workspace.

Import Projects

  • In the Import window select the General→Existing Projects into Workspace option.

Existing Projects Import

  • In the Import Projects window select the SDK_Workspace folder as root directory. After the root directory is chosen the projects that reside in that directory will appear in the Projects list. Press Finish to finalize the import process.

Projects Import

  • The Project Explorer window now shows the projects that exist in the workspace and the files for each project. The SDK should automatically build the projects and the Console window will display the the result of the build. If the build is not done automatically select the Project→Build Automatically menu option.

Project Explorer

Downloads

The HDL Reference Designs and the no-OS Software can be downloaded from the Analog Devices github.


The software project contains 2 components: the Reference Design files and the ADV7511 Transmitter Library. All the components have to be downloaded from the links below.

Evaluation Scripts:

HDL Reference Designs:

no-OS Software:


Tar file contents

The tar file contains, in most cases, the following files and/or directories. To rebuild the reference design simply double click the XMP file and run the tool. To build SDK, select a workspace and use the C file to build the elf file. Please refer to Xilinx EDK documentation for details.

license.txt ADI license & copyright information.
system.mhs MHS file.
system.xmp XMP file (use this file to build the reference design).
data/ UCF file and/or DDR MIG project files.
docs/ Documentation files (Please note that this wiki page is the documentation for the reference design).
sw/ Software (Xilinx SDK) & bit file(s).
cf_lib/edk/pcores/ Reference design core file(s) (Xilinx EDK).

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