ZHCSKE4C october   2016  – december 2020 DS280MB810

PRODUCTION DATA  

  1.   1
  2. 特性
  3. 应用
  4. 说明
  5. Revision History
  6. Description (continued)
  7. Pin Configuration and Functions
  8. 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 Timing Requirements – Serial Management Bus Interface
    7. 7.7 Typical Characteristics
  9. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Device Data Path Operation
      2. 8.3.2 AC-coupled Receiver Inputs
      3. 8.3.3 Signal Detect
      4. 8.3.4 2-Stage CTLE
      5. 8.3.5 Driver DC Gain Control
      6. 8.3.6 2x2 Cross-point Switch
      7. 8.3.7 Configurable SMBus Address
    4. 8.4 Device Functional Modes
      1. 8.4.1 SMBus Slave Mode Configuration
      2. 8.4.2 SMBus Master Mode Configuration (EEPROM Self Load)
    5. 8.5 Programming
      1. 8.5.1 Transfer of Data with the SMBus Interface
    6. 8.6 Register Maps
      1. 8.6.1 Register Types: Global, Shared, and Channel
      2. 8.6.2 Global Registers: Channel Selection and ID Information
      3. 8.6.3 Shared Registers
      4. 8.6.4 Channel Registers
  10. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Backplane and Mid-Plane Reach Extension
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
      2. 9.2.2 Front-Port Applications
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
        1. 9.2.3.1 Pattern Generator Characteristics
        2. 9.2.3.2 Equalizing Moderate Pre-Channel Loss
        3. 9.2.3.3 Equalizing High Pre-Channel Loss
        4. 9.2.3.4 Equalizing High Pre-Channel Loss and Moderate Post-Channel Loss
    3. 9.3 Initialization Set Up
  11. 10Power Supply Recommendations
  12. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Examples
      1. 11.2.1 Stripline Example
      2. 11.2.2 Microstrip Example
  13. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
  14. 13Mechanical, Packaging, and Orderable Information

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Front-Port Applications

The DS280MB810 has strong equalization capabilities that allow it to equalize insertion loss and extend the reach of front-port channels by 17 dB beyond the normal capabilities of the ASIC while supporting CAUI-4 and CR4 electrical requirements. The DS280MB810 is designed to apply gain in a linear fashion in order to support longer distances between the switch ASIC and the front-port module. Figure 9-5 illustrates a configuration where two DS280MB810s are used to mux between one QSFP28 port and four SFP28 ports. Figure 9-9 shows the simplified schematic for this application.

GUID-13ECC815-F589-440F-ABF1-BD0BC432648D-low.gifFigure 9-5 Front-port application block diagram

Standard front-port modules have AC coupling capacitors included inside the module. The DS280MB810, therefore, is ideal for front-port Egress signal conditioning applications since it includes AC coupling capacitors on the input (RX) side and does not include AC coupling capacitors on the output (TX) side.

GUID-ABA503D9-EDB8-4C43-A93E-3E2E09D876B7-low.gifFigure 9-6 DS280MB810 recommended for front-port Egress

The optimum solution for front-port Ingress signal conditioning applications depends on whether the ASIC RX supports DC coupling and whether it can support an input common mode voltage of 1.05 V. For further guidance on determining if the ASIC RX supports DC coupling, refer to Figure 9-2. If the ASIC RX supports DC coupling and can tolerate an input common mode voltage of 1.05-V or less, then the DS280MB810 is the optimum solution for front-port Ingress signal conditioning. If the ASIC RX does not support DC coupling or cannot tolerate an input common mode voltage of 1.05-V, then the pin-compatible DS280DF810 Retimer with cross-point, which has integrated AC Coupling capacitors on both RX and TX, may be the optimum solution.

GUID-E65BAA25-23C8-4DEE-9D01-56987D1A36A2-low.gifFigure 9-7 DS280MB810 recommended for front-port Ingress
GUID-23D15CFF-79A0-4293-A05D-A283B9732460-low.gifFigure 9-8 DS280MB810 or DS280DF810 recommended for front-port Ingress
GUID-AE27C7AC-E0DE-4BAF-B219-104F07FDBA5A-low.gifFigure 9-9 Front-port application simplified schematic