DP83630

Could you clarify your question on the MAC address?  Are you referring to the Phy Control Frame and Phy Status Frame configuration in the PCFCR and PSF_CFG0 registers, respectively?

The CLK_OUT pin can be used for several functions - a PTP clock, an RMII clock, a synchronous recovered clock, or a buffered version of the X1 reference clock.  Are you intending to use the clock as a buffered version of the X1 reference clock? 

The best resource for information on support for IEEE 1588 PTP packet timestamping and clock synchronization is the Software Design Guide (SDG) and C Software Reference.  This can be downloaded from:

http://www.ti.com/litv/zip/snlc036

The SDG should provide you with a good regarding what is required.

Patrick

Dear Patric!

Thank you.

1. Concerning MAC address: Does DP83630 have unique 48-bit address for the network Ethernet? Or do we need to acquire the address separately?

I give an example: Miсrochip issues a special memory chips, which has a unique 48-bit address (to work with Ethernet Controller made Miсrochip).

2. Please, explain, can we use packet timestamping and clock synchronisation in MCU type Cortex-M4F? Is it possible to do it without installing the Operating System (Linux like) on MCU? 

3. We'd like to use MII interface between  DP83630 and MCU. We're going to use 25 MHz crystal with DP83630. Please, answer, how do we need to synchronize MCU? Can we use CLK_OUT pin of DP83630 and feed this frequency to X1 input of MCU? Or can we use own crystal with MCU, and use other frequency, for example 16 MHz?

Yours sincerely

Vladimir Naumenkov

www.agat.by

Vladimir,

For the network MAC address, you will need to acquire the address separately. 

I have shared your question about using a Cortex-M4F MCU with our MCU team.  I will let you know what they recommend.

For MII, the transmit (TX_CLK) and receive (RX_CLK) MII clocks are sourced by the Phy.  In my experience, an additional 25MHz clock from the Phy to the MAC is not necessary.  Any additional clock requirement would depend on the MCU MAC.  The DP83630 can output a buffered version of the X1 reference clock using the CLK_OUT pin if needed.

Patrick

Dear Patrick,

Thank you very much!

Yours sincerely,

Vladimir Naumenkov  

www.agat.by

Vladimir,

I believe you can find examples of IEEE 1588 implementations in Cortex-M3 and Cortex-M4F MCUs, but I have not had any experience with these implementations so I cannot make any recommendations.  I would suggest following up with specific MCU vendors to understand the MCU implementation and any software considerations.

Patrick

Dear Patrick!

Thank you

 Please, help me  to clarify the next: for using packet timestamping and clock synchronisation we can communicate between DP83630 and PC, or on the both ends of the link must be DP83630s ?

Thank you

Yours sincerely

Vladimir Naumenkov