DP83867IR: About PHYCR

Hi Geet-san,

 Thank you very much for your prompt reply.

 Please let me ask you two additional questions.

 Q1）Can the DP83867IRPAPR be configured to 10Mbps(fixed) or 100Mbps(fixed) with
　  　Disable Auto-Negotiation by using Strap pins?

 Q2）If the device set to the following values by the Strap pins is
         turned on,will the port speed be set 1000Mbps?
                  AGEN_SEL[1:0]=b'11
                  Autoneg Disable=b'1

Thank you and best regards,
Tsuyoshi Tokumoto

Hi Tokumoto-san,

Q1:  ANEG_SEL[0:1] = 11 shall help force the link to 10/100M speed. 

Q2: For 1000M, ANEG_SEL[0:1]  : 01.

Regards,
Geet

Hi Geet-san,

　Thank you very much for your prompt reply.
　Please let me ask you two basic questions.

　I am being asked from my customer about the port speed
　when Auto-Negotiation function is disabled through the straps.

　I found out a following post on E2E.

e2e.ti.com/.../548482

　According to the above post,I understand that the PHY cannot be forced
　into any speed through straps and the speed select straps are used for controlling
　auto-negotiation advertisement.

　From the above,

Q1) I think that the port speed is configured to 1Gbps immediately after the power-on,
　　because the default values of bit6 and bit13 of BMCR are set to b'10.
　　Is my understanding correct?

Q2) If a user want to fix the port speed,the user will have to write the configuration
　　values directly to bit6,13 of BMCR through the MDIO/MDC.
　　Then, the user will have to perform the global-software-restart(setting bit 14 of register
　　CTRL to 1).
　　Is my understanding correct?
　　In addition, will there be anything that the user should be careful of?

Thank you and best regards,
Tsuyoshi Tokumoto

Hi Geet-san,

  Thank you for your reply and I apologize for the delay
  in replying to you.

  My questions have been almost cleared up, but please let me reconfirm
  the following question.

  When my customer wants to use force mode(Auto-Neg disable)
  and use 100M speed, performing the global-software-restart(setting bit 14 of register
  CTRL to 1) is needed after writing "01" to bit6,13 of BMCR through the MDIO/MDC.

  Is my understanding correct?

Thank you and best regards,
Tsuyoshi Tokumoto

Hi Geet-san,

  Thank you very much for your reply.

  Which is correct, Software restart or Software reset?

Thank you and best regards,
Tsuyoshi Tokumoto

Hi Pimentel-san,

　Thank you very much for your reply.

　My questions have been cleared up!

Thank you and best regards,
Tsuyoshi Tokumoto