JAJSR79 September   2023 TUSB211A

PRODUCTION DATA  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  5. 4 Revision History
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Timing Requirements
    8. 6.8 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 High-Speed EQ
    4. 7.4 Device Functional Modes
      1. 7.4.1 Low-Speed (LS) Mode
      2. 7.4.2 Full-Speed (FS) Mode
      3. 7.4.3 High-Speed (HS) Mode
      4. 7.4.4 High-Speed Downstream Port Electrical Compliance Test Mode
      5. 7.4.5 Shutdown Mode
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Test Procedure to Construct USB High-Speed Eye Diagram
          1. 8.2.2.1.1 For a Host Side Application
          2. 8.2.2.1.2 For a Device Side Application
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 ドキュメントの更新通知を受け取る方法
    2. 9.2 サポート・リソース
    3. 9.3 Trademarks
    4. 9.4 静電気放電に関する注意事項
    5. 9.5 用語集
  11. 10Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

8.2.2 Detailed Design Procedure

The ideal EQ setting is dependent upon the signal chain loss characteristics of the target platform. The recommendation is to start with EQ Level 0, and then increment to EQ Level 1, and so on.

For the TUSB211A to recognize any change to the EQ setting, the RSTN pin must be toggled. This is because the EQ pin is latched on power up and the pin is ignored thereafter.

Placement of the device is also dependent on the application goal. Table 8-2 describes TI recommendations.

Table 8-2 Platform Placement Guideline
PLATFORM GOALSUGGESTED TUSB211A PLACEMENT
Pass USB Near End Mask at the receptacleClose to measurement point (connector)
Pass USB Far End Eye Mask at the plugClose to USB PHY
Cascade multiple TUSB211As to improve device enumerationMidway between each USB interconnect
Table 8-3 Table of Recommended Settings
EQ settings(1) for channel loss
Pre-channel cable length (Between USB PHY and TUSB211A) EQ
0-3 meter Level 0
2-5 meter Level 1
Post-channel cable length (Between TUSB211A and inter-connect) EQ
0-2 meter Level 0
1-4 meter Level 1
(1) These parameters are starting values for different cable lengths. Further tuning might be required based on specific host or device as well as cable length and loss profile.