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DP83849I: PHY address : 4bit[3:0] or 4bit[4:1] or 5bit[4:0]?

Tao_2199
Genius 5770 points
Part Number: DP83849I

Hello,

 

Regarding to PHY address on DP83849I, my customer is asking a question.

(Question)

PHY address register is described both as 4bit and 5bit in datasheet.

For example, it is described as 4bit[3:0] in page 62 but it is described as 5bit[4:0] in page 77.

Also, it is described as 4bit[4:1] in page 10.

Which is correct, 4bit[3:0] or 4bit[4:1] or 5bit[4:0]?

 

Regards,

Tao_2199

  • 0
    TI__Mastermind 23675 points

    Hi Tao,

    There is an error on page 62.

    Page 77 and page 10 are correct.

    The PHY address is a bit[4:0]. Bit[0] depends on the Port, i.e. 0b0 for Port A and 0b1 for Port B.

    On page 10, it is explaining how Bit[4:1] are selected based on bootstrap.

    On page 77, the field is Bit[4:0], which matches page 10.

  • 0 in reply to Ross Pimentel
    Genius 5770 points

    Hello Ross,

     

    Thank you for reply.

    I have more some question.

    (1) When PHY address strap pin is set as “0000”,

    port A address is strapped 00000(0h) and port B address is strapped 00001(1h).

    In this case, port B address is strapped automatically. (As Port A address +1)

    My understanding is correct?

     

    (2) About bit0 of PHY address register (page 77)

    This value is fixed zero and can’t be changed by user.

    (Regardless of bit0 value, port B address is strapped ss Port A address +1.)

    My understanding is correct?

     

    Regards,

    Tao_2199

  • 0 in reply to Tao_2199
    Genius 5770 points

    Hello Ross,

     

    Would you let me know current status about my re-question?

    (bit0 of PHY address register (page 77))

     

    Regards,

    Tao_2199