SNLU335 October   2023 DS320PR410

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Access Methods
    1. 1.1 Register Programming Through SMBus
    2. 1.2 Device Configuration Through External EEPROM
  5. 2Register Mapping
    1. 2.1 Share Registers
    2. 2.2 Channel Registers
  6. 3Equalization Control Settings
  7. 4CTLE Index and Flat Gain Selection Matrix
  8. 5Programming Examples
  9. 6References
  10. 7Revision History

5 Programming Examples

In the examples below, assume that SMBus secondary address 0x18 is used for Device 0 (Channels 0-3) and SMBus secondary address 0x1A is used for Device 1 (Channels 0-3). Example code using TotalPhase Aardvark I2C controller.

  • PD control through register programming
    • Broadcast write to Device 0 and Device 1 Bank 0 registers at Channel register 0x85 (Channel base register 0x80 + PD Override register 0ffset 0x05) with a value of 0x80 to power down all channels.
      • <i2c_write addr="0x18" count="0" radix"16">85 80</i2c_write>
      • <i2c_write addr="0x1A" count="0" radix"16">85 80</i2c_write>
    • Broadcast write to Device 0 and Device 1 Bank 0 registers at Channel register 0x85 (Channel base register 0x80 + PD Override register 0ffset 0x05) with a value of 0x7F to power on all channels.
      • <i2c_write addr="0x18" count="0" radix"16">85 7F</i2c_write>
      • <i2c_write addr="0x1A" count="0" radix"16">85 7F</i2c_write>
  • Broadcast Channel CTLE Index/Flat Gain Selection through register programming (CTLE Index 2, FlatGain 0dB)

    To select CTLE Index 2 with Flat Gain of 0 dB on all channels:

    • Broadcast write to Device 0 and Device 1 Bank 0 registers at Channel register 0x81 (Channel base register 0x80 + EQ Control register 0ffset 0x01) with a value of 0x98.
    • Broadcast write to Device 0 and Device 1 Bank 0 registers at Channel register 0x83 (Channel base register 0x80 + EQ/Gain Control register 0ffset 0x03) with a value of 0x05
      • <i2c_write addr="0x18" count="0" radix"16">81 98</i2c_write>
      • <i2c_write addr="0x18" count="0" radix"16">83 05</i2c_write>
      • <i2c_write addr="0x1A" count="0" radix"16">81 98</i2c_write>
      • <i2c_write addr="0x1A" count="0" radix"16">83 05</i2c_write>
  • Individual Channel CTLE Index / Flat Gain Selection via register programming (CTLE Index 2, FlatGain 0dB)

    To select CTLE Index 2 with Flat Gain of 0 dB on a single channel (Channel 0):

    • Write to Channel 0 register on Device 0 Bank 0 and Device 1 Bank 0 registers at Channel register 0x01 (Channel 0 base register 0x00 + EQ Control register 0ffset 0x01) with a value of 0x98.
    • Write to Channel 0 register on Device 0 Bank 0 and Device 1 Bank 0 registers at Channel register 0x03 (Channel 0 base register 0x00 + EQ/Gain Control register 0ffset 0x03) with a value of 0x05
      • <i2c_write addr="0x18" count="0" radix"16">01 98</i2c_write>
      • <i2c_write addr="0x18" count="0" radix"16">03 05</i2c_write>
      • <i2c_write addr="0x1A" count="0" radix"16">01 98</i2c_write>
      • <i2c_write addr="0x1A" count="0" radix"16">03 05</i2c_write>