SDAA475 August   2026 TDA4AH-Q1 , TDA4AP-Q1 , TDA4VH-Q1 , TDA4VP-Q1

1.   1
2.    Abstract
3.    Trademarks
4. 1 Introduction
5. 2USB 3.1 Compliance Mode: Theory of Operation
   1. 2.1 Acronyms and Definitions
   2. 2.2 LTSSM and RX Detect
   3. 2.3 Compliance Mode Entry Methods
   4. 2.4 Register Reference
      1. 2.4.1 xHCI PORTSC: Port Status and Control Register
      2. 2.4.2 PORTSC Bit-Field Description (USB 3.0 — xHCI Spec §4.19.7)
      3. 2.4.3 PLS Encoding: USB 3.0 Link States
      4. 2.4.4 Verifying RX Detect Before Compliance Entry
      5. 2.4.5 Compliance Write Value Decode: 0x0a010340
   5. 2.5 Compliance Pattern CP1 and SSC
      1. 2.5.1 USB PHY Register — CP1 ( Clock Pattern)
      2. 2.5.2 Register Address
      3. 2.5.3 CP1 Write Value Decode: 0x18230c10
6. 3 Compliance Procedure — TDA4VH/AH/TDA4AP/VP
   1. 3.1  Hardware Requirements
   2. 3.2  Software Requirements
   3. 3.3  EVM Setup
   4. 3.4  Compliance Pattern Reference
   5. 3.5  LFPS: Low-Frequency Periodic Signaling
   6. 3.6  Compliance Pattern 0 (CP0)
   7. 3.7  Compliance Pattern 1 (CP1)
   8. 3.8  LeCroy Scope Setup and Results
   9. 3.9  Troubleshooting
   10. 3.10 Compliance Procedure: DRA821 / TDA4AL/VL/VE / J721S2
7. 4 Summary
8. 5References