DP83826I: Operation after reset release

satoshi haraya

Part Number: DP83826I

When the RST_N pin goes from L to H, pins 13, 16, and 18 go from H to L after 35ms.
Is this the correct behavior?
What can you think of?
For reference, I will send you the circuit diagram and the waveforms of the RST_N pin and 16 pin.

over 2 years ago

Alvaro (Al-vuh-roe) Reyes over 2 years ago

TI__Mastermind 19621 points

Hi Satoshi,

In Section 7 Pin Configurations and Functions (BASIC Mode) we can see the default states of the pins. We can see that Pins 13 & 16 are PU during Reset, so them being high while the Reset pin is pulled low is to be expected. Pin 16 should be a PD however. Is there any data being sent by the MAC when you are probing these pins?

Regards,

Alvaro

satoshi haraya over 2 years ago in reply to Alvaro (Al-vuh-roe) Reyes

Prodigy 100 points

Thank you for your reply.
Use in BASIC mode.
Since Strap2 is set to pull-up (Auto Negotiation Enable), I think it will be invalid even if the 16-pin (Strap0) setting is set to pull-up (Half Duplex). Why is it necessary to make it a pulldown?
The program on the MAC side is empty, so no data is being sent.

Alvaro (Al-vuh-roe) Reyes over 2 years ago in reply to satoshi haraya

TI__Mastermind 19621 points

Hi Satoshi,

I apologize for the confusion, there is a typo in my previous response. I meant to say that Pin 18 (not pin 16) is expected to be PD during reset. Pins 13 & 16 are behaving as expected.

Are there any functional issues because of this?

Regards,

Alvaro

satoshi haraya over 2 years ago in reply to Alvaro (Al-vuh-roe) Reyes

Prodigy 100 points

Thank you for your reply.
I'm concerned about the 18-pin (strap10) setting.
Used in BASIC mode + RMII slave mode.
Therefore, pin 18 (strap10) is pulled up with an external resistor.
Is this correct?