DS280DF810: The firmware for DS280DF810

Hello Zhang,

Due to the US Christmas and New Year holidays, the response to your question will be delayed. We have assigned an engineer to this E2E thread and will look into your question when the engineers return (which I expect early next week). Sorry for the wait and any inconvenience it may cause.

Best,
David

Hi Drew,

We have got the DS280DF810 board based on our design, and now, we have no EEPROM and I2C write the reg, tge ALL_DONE_N=1.2V,

please kindly advise how to check if this board is OK or not? thanks.

Hi Zhang,

What aspects of the board do you need to validate?

You can check that the DS280DF810 is powered and I2C is working by reading back the device ID from the DS280DF810.

For high speed validation, we typically recommend measuring BER using a pattern like PRBS31.

Thanks,

Drew

Hi Drew,

Thanks for your reply;

1. Another question, could you please help confirm the format of register read and write? For example, I am currently/ The i2cotool64 1 6 1 0x30 0xfe

command read the return value 0x03 of the device ID and then used/ When reading the value of the 2f register from i2ctool64 1 6 1 1 0x30 0x2f,

it is different from the default value written in the specification. The read value is 0x00, and then I don't know how to write this 0x2f register.

2. Please check If the  ommunication is normal when the input is 10G signale? thanks.

Hi Drew,

Drew Miller1 said:

There are a couple things to check for 10G signal.

1. Confirm you have signal detect (channel register 0x78[5])
2. Confirm you have CDR lock (channel register 0x78[4])
   1. If you don't have CDR lock, review channel register 0x02
3. Check eye measurements (channel registers 0x27, 0x28)
   1. TI has empirically observed good BER performance for HEO >= 0.4UI; VEO >= 200mVppd

We check the register 0x78/ 0x27/ 0x28 are all 00, so plesae advsie how to proceed to Next step, thanks.

Hi Zhang,

Please confirm you are selecting the correct channel register set for reading.

If you are selecting correct channel register set for reading, this indicates the device is not receiving a signal.

Can you share a block diagram of your test setup?

Thanks,

Drew

Hi Drew,

We read the Reg 0x78, 0x27 and 0x28 are all the 0, the below is the register print after the network card linkup:

And we find the Initial register is 0x00, but we don't know when the CDR is Locked, is it automatically locked?

we write the rigister by below and it is fault:

please kindly review below I2C format and advise if it is righ or not? If error, please advise how to write the reg? thanks.

Hi Zhang,

I think there is something wrong with your I2C tool.  While I2C readback of 0xFE is correct, I can also confirm that after writing 0x55 to 0xFC, you should be able to read back 0x55.

Do you know if the tool uses 7 bit or 8 bit I2C address?  Are you able to use a logic analyzer to observe the I2C R/W?

Thanks,

Drew

Hi Drew,

1. We need to use the 10G signal and we want to know if we need to write the register 0X2F and what is the 10G rate I2C address?

    The below is the "Quick Programming Guide" of the file"zhca900":

zhca900.pdf

Hi Zhang,

Do you need 10.0 Gbps, or 10.3125 Gbps (10 GbE)?

Thanks,

Drew

Hi Drew,

The rate is 10Gbps, this is the initial design;

BTW, I am adjusting the parameter now but it has not changed much in terms of eye width. Our CPU is now receiving eye width close to the critical value.

Can you help us see how to adjust it? thanks.

Hi Zhang,

1. Were you able to resolve your I2C read/write issues?
2. Can you share a block diagram of your system with estimated insertion losses?
3. Have you swept TX fir settings?  Please see this application note on green-box testing.
   https://www.ti.com/lit/an/slyt678/slyt678.pdf
4. It's not clear to me how to interpret your CPU eye measurements.  Can you help clarify this?
5. Please note that the pre-configured "standard" data rate settings (reg 0x2F) do not support 10.0 Gbps.  To configure 10.0 Gbps, Please see "Manual Data Rate Configuration" section in the data sheet and program channel registers 0x60-0x63 and 0x18 accordingly.

Thanks,

Drew

Hi Drew,

I receive a phone call from TI local RSM, and I have sent the customer email to her, let us disucss this issue in the email,

customer has some questions for the eye pattern, thanks.