DP83822IF: I would like to inquire about setting DP83822IF fiber??

The strap setting is configured like a red box.
The default mode setting of the pull-down strap is not possible.
Mode-4 is recognized as Mode 1 when set.

<- Pull-down MODE Open : mode 2 set

<- Pull-down MODE 4 set : mode 1 set

Hello,

It appears that something else may be driving the line which may be interfering with the biasing of the resistor network. I would recommend holding the PHY in reset AND ensuring that the MAC is quiet on these lines. Thus the only thing theoretically biasing the line for strapping purposes would be the network.

Sincerely,

Gerome

Hello.

I saw what you sent me.
According to the document SNLR053 you sent, the RX_D0 strap is selected as Mode_4 when looking at the part that is enabled for the strap setting.

Where is this in the data sheet?

The data sheet does not say to select RX_D0 pin as Mode_4 when using Fiber mode.

Is it correct to set the RX_D0 pin to Mode_4 when using Fiber Mode?

If that's right, I think the data sheet should have this.

It's an important part, so please check it.

Hello,

If you notice closely, the PHY address, specifically PHY_AD1 will heavily influence RX_D0 which is in line with the datasheet. Please input all fields as per your design requirements to get the appropriate strap selections. If there is something that contradicts datasheet, then we can discuss further.

Sincerely,

Gerome