SDAA520 November   2026 DP83TC818S-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Architecture Comparison
      1. 1.1.1 Domain Architecture
      2. 1.1.2 Zonal Architecture
  5. 2AVB Topology
    1. 2.1 Role of TSN
    2. 2.2 Role of Talker
    3. 2.3 Role of Listener
  6. 3AVTP Audio Format
  7. 4Clock Reference Format
  8. 5Advantage of TI PHYs for AVB Applications
    1. 5.1 BOM Reduction
    2. 5.2 Reduced Software Complexity
  9. 6Summary
  10. 7References

2.2 Role of Talker

The talker is the source of audio content on the AVB network. It encapsulates audio data into IEEE 1722 (AVBTP) packets and transmits them onto the network. There are two key types of talker streams in automotive AVB:

  • Clock Reference Format (CRF) Talker: Generates and transmits CRF packets containing timestamps spaced according to the period of the audio sample rate. For example, if audio is sampled at 48KHz, timestamps within a CRF packet would be spaced by:
    Equation 1. 1 48 KHz s
    These timestamps are also padded with the maximum network transit time so that listeners receive the timestamps before the time encoded by the timestamp has passed.
  • Audio Talker: Encapsulates audio samples in IEEE 1722 packets and attaches a presentation time to each packet. This presentation time specifies the exact moment at which the audio must be played at all listener endpoints, providing synchronous playback across the network.