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DS280DF810: The 10G

Zhang Liang
Genius 4135 points
Part Number: DS280DF810

Tool/software:

Hi,

We use the DS280DF810 with the EEPROM design in our project, and the 25Gbps design is OK, 

Now we have below issue for 10Gbps design:

1. This 25G network card will be compatible with 10G usage in the future, but I don't want to burn the EEPROM again. Now there is a solution that needs to be confirmed with TI to see if it is feasible.

The specification sheet says that DS280DF810 will access from different starting bits of EEPROM based on different I2C addresses.

I am planning to revise it by switching the I2C address of the retimer chip to achieve two I2C addresses corresponding to different rates on one chip. Can EEPROM package all parameters of both rates?

2. We also need to design this 100G card, which will use two DS280DF810 cards. Could you please help confirm the specific wiring method?

The block diagram on the specification sheet uses EEPROM mode, and the two retimers share the crystal oscillator and EEPROM according to the wiring method shown in the figure below.

Also, if the parameters used by the two retimers are the same as those of the 25G network card, can they share the same version of EEPROM as the first point 25G/10G network card?

  • 0
    TI__Mastermind 36153 points

    Hi Zhang,

    1. Yes, it is possible to have different configurations at different I2C addresses.  We could support separate 10G and 25G configurations.  What is the customer's EEPROM size?  I would like to confirm that both configurations can fit on the same EEPROM.

    Regarding "I don't want to burn the EEPROM again", the meaning of this is a bit unclear to me.  From my perspective, it seems like EEPROM will have to be reprogrammed to support both 10G and 25G configurations.

    We can also support 10G and 25G with the same configuration if the customer would be interested in this.

    2. Yes, the wiring is correct.

    You will need to add address map headers for the second I2C address.  Add "003300005501003300003300" for EEPROM addresses 15-26.

    Thanks

    Drew

  • 0 in reply to Drew Miller1
    Genius 4135 points

    Hi Drew,

    Drew Miller1 said:
    Yes, it is possible to have different configurations at different I2C addresses.  We could support separate 10G and 25G configurations.  What is the customer's EEPROM size? 

    Our EEPROM size is 1KB, and please advise if we need to increase storage capacity? 

    2KB+ size is not support for DS280DF810, it is right?

    Drew Miller1 said:
    I would like to confirm that both configurations can fit on the same EEPROM.

    Please also confirm how to both configurations can fit on the same EEPROM?

  • 0 in reply to Zhang Liang
    TI__Mastermind 36153 points

    Hi Zhang,

    Zhang Liang said:
    2KB+ size is not support for DS280DF810, it is right?

    2 KB is the maximum supported size.  Greater than 2 KB will not work.

    Zhang Liang said:
    Our EEPROM size is 1KB, and please advise if we need to increase storage capacity? 

    If the customer configuration is such that the configuration for CH0=CH4, CH1=CH5, CH2=CH6, and CH3=CH7, then it is possible to fit two configuration in 1 KB.

    If customer needs unique configuration for each channel for both 10G and 25G, then I would recommend 2 KB EEPROM.

    Zhang Liang said:
    Please also confirm how to both configurations can fit on the same EEPROM?

    One configuration can be placed after the other configuration and the address map header can be updated to point at the second configuration.

    Thanks,

    Drew