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TMS320F28388D: Ethernet PHY clock source

Amtech
Genius 4535 points
Part Number: TMS320F28388D
Other Parts Discussed in Thread: DP83826E

Hello,

We are designing new control using TMS320F28388D DSP. In this control we will use Ethernet interface using DP83826E PHY device. 

We are planning to use 20MHZ crystal as a external clock source for DSP. Now can we apply 25MHZ clock to DP83826E PHY device from (XCLKOUT) External clock of  DSP?

With Regards,

Dushyant Rana

  • 0
    TI__Expert 4145 points

    Dushyant,

    You can refer to figure 41-1 CM Clocking System for the configurable clock sources to Ethernet.

    You can update the AuxPLLRAWCLK to choose XTAL.

    SysCtl_setEnetClk(SYSCTL_ENETCLKOUT_DIV_2, SYSCTL_SOURCE_SYSPLL);

    The above API is used to select the divider and source to Ethernet clock. 

    Regards,

    Yashwant

  • 0 in reply to Yashwant Temburu1
    Genius 4535 points

    Dear Yashwant,

    Thanks for your reply,

    But here i am not asking for clocking for internal Ethernet block of TMS320F28388D DSP.

    As DP83826E PHY device needs 25Mhz Crystal or oscillator input clock.

    Now instead using Crystal or oscillator, Can i use XCLKOUT signal ( after configuring XCLKOUT to 25Mhz ) of TMS320F28388D DSP to  XI signal of DP83826E PHY device?

    Regards,

    Dushyant Rana

  • 0 in reply to Amtech
    TI__Expert 4145 points

    Dushyant,

    Our Expert on the clocking systems is on a holiday. Pleas expect a reply by the beginning of next month. 

    Apologies for the delay.

    Regards,

    Yashwant