SDI Audio IP User Guide

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ID 683333
Date 6/15/2025
Public
Document Table of Contents
Document Table of Contents x
1. About the SDI Audio IP 2. SDI Audio IP Getting Started 3. SDI Audio Altera FPGA IP Functional Description 4. SDI Audio Altera FPGA IP Parameters 5. SDI Audio Altera FPGA IP Interface Signals 6. SDI Audio Altera FPGA IP Registers 7. SDI Audio IP User Guide Archives 8. Document Revision History for the SDI Audio IP User Guide
1. About the SDI Audio IP x
1.1. SDI Audio IP Device Support 1.2. SDI Audio IP Release Information 1.3. SDI Audio IP Performance and Resources
2. SDI Audio IP Getting Started x
2.1. Instantiating the SDI Audio Altera FPGA IP Simulating the Testbench
3. SDI Audio Altera FPGA IP Functional Description x
3.1. SDI Audio Embed IP 3.2. SDI Audio Extract IP 3.3. SDI Clocked Audio Input IP 3.4. SDI Clocked Audio Output IP 3.5. AES Format 3.6. Avalon Streaming Interface Audio Interface
4. SDI Audio Altera FPGA IP Parameters x
4.1. SDI Audio Embed IP Parameters 4.2. SDI Audio Extract IP Parameters 4.3. SDI Clocked Audio Input IP Parameters 4.4. SDI Clocked Audio Output IP Parameters
5. SDI Audio Altera FPGA IP Interface Signals x
5.1. SDI Audio Embed IP Signals 5.2. SDI Audio Extract IP Signals 5.3. SDI Audio Clocked Input Signals 5.4. SDI Audio Clocked Output Signals 5.5. SDI Audio IP Register Interface Signals
6. SDI Audio Altera FPGA IP Registers x
6.1. SDI Audio Embed Registers 6.2. SDI Audio Extract Registers 6.3. SDI Clocked Audio Input Registers 6.4. SDI Clocked Audio Output Registers
1. About the SDI Audio IP
2. SDI Audio IP Getting Started
3. SDI Audio Altera FPGA IP Functional Description
4. SDI Audio Altera FPGA IP Parameters
5. SDI Audio Altera FPGA IP Interface Signals
6. SDI Audio Altera FPGA IP Registers
7. SDI Audio IP User Guide Archives
8. Document Revision History for the SDI Audio IP User Guide

3.5. AES Format

The SDI cores use the AES standard. The Audio Engineering Society (AES), together with the European Broadcasting Union (EBU), created a digital audio transmission standard known as the AES/EBU standard. The AES standard is a digital audio standard for transporting digital audio signals serially between devices.

Using the AES format requires the entire 64-bit AES frame to be sent serially. As the AES defines the preambles as biphase mark codes, which cannot be directly decoded to 4 bits, you must replace the preambles with X = 0000b, Y = 0001b, and Z = 0010b. This internal AES format serializes the bit-parallel data words by sending the least significant bits (LSB) first, with the audio sample (up to 24 bits).

Figure 4. Internal AES Format Timing Diagram
Level Two Title