DP83867IR: Reserved bit on the register

Hi Atsushi,

This is a good question. I checked a known good board with the RGZ version of the 867 and also read Reg 0x6F, Bit[8]=1. This part is functional and this shouldn't affect the customer's board. To confirm the other reserved bits I would need to check other boards and discuss with our design team, which would take time.

Bits 6:4 are the same as the RGZ, they are what RGMII TX_CLK delay is added, which is controlled by the strap settings.

Regards,

Alvaro

Hi Alvaro-san、

Thank you for your reply.

You said; 

his is a good question. I checked a known good board with the RGZ version of the 867 and also read Reg 0x6F, Bit[8]=1.

Do you know why it is asserted to "1"?

The default must be "0".

Hi Atsushi,

I would need to confirm this with my design team, but I suspect this might be a typo in the data sheet. Register 0x31 provides another hint, seems like Reg 0x6F bit[8] = 1 should be the default.

Regards,

Alvaro

Hi Alvaro-san,

Thank you for your reply.

Could you confirm it with the design team?

We need reliable information on this.

Hi Atsushi,

Yes I can. We have a meeting later this week where I can ask them. Please allow me until EOD Friday to respond to you.

Regards,

Alvaro

Hi Alvaro-san,

Thank you for your support.

I'm looking forward to hearing from you.

Hi Atsushi,

The meeting with Design was pushed to next week. I apologize for the delay, but the question has been communicated to them. I will continue to remind them and hopefully I can get a response early next week.

Regards,

Alvaro

Hi Alvaro-san,

Thank you for your support.

I'm look forward to hearing from you next week.

Hi Atsushi,

Apologies for the delay, during the meeting other queries took precedence and they didn't get to it. I am sure this is a typo. I have a functional setup that reads the same values. I have and will continue to pressing our Design team on a separate email chain to get resolution on this.

Regards,

Alvaro

Hi Atsushi!

At long last I got confirmation from design that this is a typo. Please disregard.

Regards,

Alvaro