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TJA1121: Difference between DEVICE_CONTROL_START_OPERATION and PHY_CONTROL_START_OPERATION

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TJA1121: Difference between DEVICE_CONTROL_START_OPERATION and PHY_CONTROL_START_OPERATION

‎03-20-2026 10:12 AM
244 次查看
peter123
Contributor II

From the TJA1121 AN4517, the last step of PHY initialization is DEVICE_CONTROL_START_OPERATION=1.  However, the demo code didn't write to 0x40 but instead write to register 0x8100 (PHY_CONTROL) to start PHY operation.  What's the difference between the two registers?  Now the PHY_STATUS MM30.0x810C=0x10A (i.e. link is in sync state but Transmit state is SEND_Z).   But the same code on EVK works fine.  Why the transmitter state is SEND_Z?  What debug steps do you suggest?  Thanks.

Config:

  • Config6=open: autonomous lead
  • I haven't started data transfer from MCU to TJA1121 via SGMII yet
  • Device confirmed not in reset (via reset pin) or low power mode (8181h is 0x0000)
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