SNLA475 October   2024 DS250DF410 , DS250DF810 , DS280BR810 , DS280BR820 , DS280DF810 , DS280MB810 , DS560MB410

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Codesign: 25GbE 4-Channel Retimer or Redriver with Crosspoint
    1. 2.1 DS250DF410 Retimer Overview
    2. 2.2 DS560MB410 Redriver Overview
    3. 2.3 Pin Comparison Table
    4. 2.4 Codesign Schematic Example
    5. 2.5 Notable Codesign Elements
      1. 2.5.1 Calibration Clock
      2. 2.5.2 SMBus Address
      3. 2.5.3 SMBus Controller Mode
      4. 2.5.4 SMBus Pull-Up Resistors
      5. 2.5.5 Interrupt Output
      6. 2.5.6 Mux Select Inputs
  6. 3Codesign: 25GbE 8-Channel Retimer or Redriver with Crosspoint
    1. 3.1 DS250DF810 and DS280DF810 Retimers Overview
    2. 3.2 DS280BR810, DS280BR820, and DS280MB810 Redrivers Overview
    3. 3.3 Pin Comparison Table
    4. 3.4 Codesign Schematic Example
    5. 3.5 Notable Codesign Elements
      1. 3.5.1 AC Coupling
      2. 3.5.2 Calibration Clock
      3. 3.5.3 SMBus Address
      4. 3.5.4 SMBus Controller Mode
      5. 3.5.5 SMBus Pull-Up Resistors
      6. 3.5.6 Interrupt Output
      7. 3.5.7 Mux Select Inputs
  7. 4Summary
  8. 5References

3.5.3 SMBus Address

Pins D13 (ADDR0) and E13 (ADDR1) are connected such that the 8-bit SMBus address for DS2x0DF810, DS280BR8x0, and DS280MB810 is 0x30 by default. Strap resistors R1, R2, R8, and R9 can be populated/depopulated with different values to select a different SMBus address. The four defined strap options are:

  • 0: 1kΩ to GND
  • R: 20kΩ to GND
  • F: Float
  • 1: 1kΩ to VDD
Table 3-3 SMBus Address Map
7-BIT TARGET ADDRESS 8-BIT WRITE ADDRESS REQUIRED ADDRESS PIN STRAP VALUE
ADDR1 ADDR0
0x18 0x30 0 0
0x19 0x32 0 R
0x1A 0x34 0 F
0x1B 0x36 0 1
0x1C 0x38 R 0
0x1D 0x3A R R
0x1E 0x3C R F
0x1F 0x3E R 1
0x20 0x40 F 0
0x21 0x42 F R
0x22 0x44 F F
0x23 0x46 F 1
0x24 0x48 1 0
0x25 0x4A 1 R
0x26 0x4C 1 F
0x27 0x4E 1 1