F-Tile Architecture and PMA and FEC Direct PHY IP User Guide

ID 683872
Date 1/24/2024
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3.14.2.2.3. FGT Attribute Access Method Example 3

The following examples demonstrate the steps to perform polarity inversion for the FGT PMA.

To reverse the polarity of TX p and n pins:

  1. Write 0x1A065 to address 0x9003C.
  2. Poll address 0x90040 until bit 14 = 0 and bit 15 = 1.
  3. Write 0x12065 to address 0x9003C.
  4. Poll address 0x90040 until bit 14 = 0 and bit 15 = 0.

To reverse the polarity of RX p and n pins:

  1. Write 0x1A066 to address 0x9003C.
  2. Poll address 0x90040 until bit 14 = 0 and bit 15 = 1.
  3. Write 0x12066 to address 0x9003C.
  4. Poll address 0x90040 until bit 14 = 0 and bit 15 = 0.

To revert back the polarity of TX p and n pins:

  1. Write 0x0A065 to address 0x9003C.
  2. Poll address 0x90040 until bit 14 = 0 and bit 15 = 1.
  3. Write 0x02065 to address 0x9003C.
  4. Poll address 0x90040 until bit 14 = 0 and bit 15 = 0.

To revert back the polarity of RX p and n pins:

  1. Write 0x0A066 to address 0x9003C.
  2. Poll address 0x90040 until bit 14 = 0 and bit 15 = 1.
  3. Write 0x02066 to address 0x9003C.
  4. Poll address 0x90040 until bit 14 = 0 and bit 15 = 0.