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TM4C1294NCPDT: PHY is not Resetting using EPHY_RCR Register

Amol Borase
Prodigy 10 points
Part Number: TM4C1294NCPDT

Tool/software:

Hello 

I am Resetting PHY using below command and Reading same register to verify that bit is set or not. but getting 0 on reading. 

EMACPHYWrite(EMAC0_BASE, PHY_PHYS_ADDR, EPHY_RCR, EPHY_RCR_SWRST);  // Write reset command

 SysCtlDelay(2000000); 

Actually want to reset PHY like resetting on hard reset / power cycle through code. We found that using EPHY_RCR_SWRST this bit it clears all PHY registers. 

Please suggest if any other register of PHY  from which we can completely initialize.

Thanks,

Regards

Amol Borase

  • 0
    TI__Guru**** 183536 points

    Hi,

    Amol Borase said:
    Actually want to reset PHY like resetting on hard reset / power cycle through code.

     You can use SysCtlPeripheralReset(SYSCTL_PERIPH_EPHY0) to reset the PHY.

  • 0 in reply to Charles Tsai
    Prodigy 10 points
    Thank you for quick reply charles
    SDK version  : 2.1.4.178 
    1. Here I am resetting PHY in timer interrupt handler , so does it requires any delay to execute reset instruction you mentioned above? 
    After PHY reset I am resetting controller so , all registers of PHY will get reset or how it will be 
    2. what is difference between SysCtlPeripheralReset(SYSCTL_PERIPH_EPHY0) and SysCtlPeripheralDisable(SYSCTL_PERIPH_EPHY0) APIs, with reference to PHY register
  • 0 in reply to Amol Borase
    TI__Guru**** 183536 points
    Amol Borase said:
    1. Here I am resetting PHY in timer interrupt handler , so does it requires any delay to execute reset instruction you mentioned above? 
    After PHY reset I am resetting controller so , all registers of PHY will get reset or how it will be 

    Hi,

      A reset using SysCtlPeripheralReset(SYSCTL_PERIPH_EPHY0) will reset all its registers to its default reset state. I don't think a delay is needed when applying the reset.

    Amol Borase said:
    2. what is difference between SysCtlPeripheralReset(SYSCTL_PERIPH_EPHY0) and SysCtlPeripheralDisable(SYSCTL_PERIPH_EPHY0) APIs, with reference to PHY register

    SysCtlPeripheralReset is to perform a reset to the specified peripheral while SysCtlPeripheralDisable will disable clocks to the specified peripheral.