JAJSFM3E February   2015  – June 2018 LMH1218

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      SPI概略回路図
  4. 4 改訂履歴
  5. 5 概要（続き）
  6. 6 Pin Configuration and Functions
    1.     Pin Descriptions – SPI Mode/ Mode_SEL = 1 kΩ to VDD
    2.     Pin Descriptions – SMBUS Mode/ MODE_SEL = 1 kΩ to GND
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Recommended SMBus Interface AC Timing Specifications
    7. 7.7 Serial Parallel Interface (SPI) Bus Interface AC Timing Specifications
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Loss of Signal Detector
      2. 8.3.2 Continuous Time Linear Equalizer (CTLE)
      3. 8.3.3 2:1 Multiplexer
      4. 8.3.4 Clock and Data Recovery
      5. 8.3.5 Eye Opening Monitor (EOM)
      6. 8.3.6 Fast EOM
        1. 8.3.6.1 SMBus Fast EOM Operation
        2. 8.3.6.2 SPI Fast EOM Operation
      7. 8.3.7 LMH1218 Device Configuration
        1. 8.3.7.1 MODE_SEL
        2. 8.3.7.2 ENABLE
        3. 8.3.7.3 LOS_INT_N
        4. 8.3.7.4 LOCK
        5. 8.3.7.5 SMBus MODE
        6. 8.3.7.6 SMBus READ/WRITE Transaction
        7. 8.3.7.7 SPI Mode
          1. 8.3.7.7.1 SPI READ/WRITE Transaction
          2. 8.3.7.7.2 SPI Write Transaction Format
          3. 8.3.7.7.3 SPI Read Transaction Format
        8. 8.3.7.8 SPI Daisy Chain
          1. 8.3.7.8.1 SPI Daisy Chain Write Example
          2. 8.3.7.8.2 SPI Daisy Chain Write Read Example
            1. 8.3.7.8.2.1 SPI Daisy Chain Length of Daisy Chain Illustration
      8. 8.3.8 Power-On Reset
    4. 8.4 Device Functional Modes
    5. 8.5 Programming
    6. 8.6 Register Maps
      1. 8.6.1 Global Registers
      2. 8.6.2 Receiver Registers
      3. 8.6.3 CDR Registers
      4. 8.6.4 Transmitter Registers
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 General Guidance for All Applications
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
    3. 9.3 Do's and Don'ts
    4. 9.4 Initialization Set Up
      1. 9.4.1 Selective Data Rate Lock
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Solder Profile
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 デバイス・サポート
      1. 12.1.1 開発サポート
    2. 12.2 ドキュメントのサポート
      1. 12.2.1 関連資料
    3. 12.3 ドキュメントの更新通知を受け取る方法
    4. 12.4 コミュニティ・リソース
    5. 12.5 商標
    6. 12.6 静電気放電に関する注意事項
    7. 12.7 Glossary
  13. 13メカニカル、パッケージ、および注文情報

8.3.6.2 SPI Fast EOM Operation

To perform EOM calculation over SPI:

  1. Enable EOM (power it on), and set VRANGE=0. Write Reg 0x24[7] to 1 to turn on fast EOM
  2. Read Reg 0x26 to initialize. Discard read data
  3. Read Reg 0x24[0] which is EOM start bit. Wait for this bit to go low
  4. Read register 0x26 EOM hit count and discard. Read on register 0x26 will automatically trigger the next Fast Eye calculation
  5. Read Reg 0x24[0]. Wait for this bit to go low
  6. Do burst read on register 0x25 and 0x26 to get the EOM count value.
  7. Repeat Steps 5 and 6 4095 times (64 × 64 cells)