GTS Transceiver PHY User Guide

ID 817660
Date 7/08/2024
Public
Document Table of Contents

3.13.2.1. GTS Attribute Access Method Example 1

The following example describes the steps to enable and disable serial loopback for the GTS PMA.
  1. To enable serial loopback:
    1. Assert RX reset.
    2. Write 0x6A040 to address 0xA403C.

      6: data field for serial loopback enable.

      A: option field to request service, not set in reset and set parameters.

      0: lane number field for physical lane 0.

      40: opcode field for serial loopback.

    3. Poll address 0xA4040 until bit 14 = 0 and bit 15 = 1.
    4. Write 0x62040 to address 0xA403C.

      6: data field for serial loopback enable.

      2: option field to de-assert service request, not set in reset and set parameters.

      0: lane number field for physical lane 0.

      40: opcode field for serial loopback.

    5. Poll address 0xA4040 until bit 14 = 0 and bit 15 = 0.
    6. Deassert RX reset.
  2. To disable serial loopback:
    1. Assert RX reset.
    2. Write 0x0A040 to address 0xA403C.

      0: data field for serial loopback disable.

      A: option field to request service, not set in reset and set parameters.

      0: lane number field for physical lane 0.

      40: opcode field for serial loopback.

    3. Poll address 0xA4040 until bit 14 = 0 and bit 15 = 1.
    4. Write 0x02040 to address 0xA403C.

      0: data field for serial loopback disable.

      2: option field to de-assert service request, not set in reset and set parameters.

      0: lane number field for physical lane 0.

      40: opcode field for serial loopback.

    5. Poll address 0xA4040 until bit 14 = 0 and bit 15 = 0.
    6. Deassert RX reset.