DP83867 PHY Power on reset duration

Divya Jyothi1

Hi Support team,

We have Virtex 7 FPGA interfaced with DP83867 PHY in one of our design.

PHY reset pin is externally pull up with 2.2K VDDIO supply. We want to know the internal power on reset time duration of PHY.

And PHY power on sequence is as below.

VDD1P0 = 1v

VDDIO = 1.8v

VDDA2P5 =2.5v

Please let us know the power on reset time duration and required power sequencing for the DP83867 PHY

Thanks & regards,

Divya

over 4 years ago

0 Gerome Cacho over 4 years ago

TI__Mastermind 39845 points

Hello Divya,

The power-on reset duration is nominally 200ms. Regarding power sequencing, in the three-supply mode, the 1.8V supply must be stable within 25ms of the 2.5V supply ramping up. Additionally the 1.8V supply should be powered down prior to the 2.5V supply.

Sincerely,

Gerome

0 Divya Jyothi1 over 4 years ago in reply to Gerome Cacho

Intellectual 270 points

Hi Gerome,

PHY is operating in 2 supply mode. It is not powering with VDDA1P8. PHY VDDIO supply is 1.8v is used.

In our case 1.8V VDDIO arriving before VDDA2P5.

Is this is OK ?. Because In the part datasheet page no 109, it is mentioned that There is no requirement for the sequence of the supplies when operating in two-supply mode.

Please clarify.

regards,

Divya

0 Gerome Cacho over 4 years ago in reply to Divya Jyothi1

TI__Mastermind 39845 points

Hi Divya,

In 2 supply mode, there is no requirement for sequencing so this should be fine.

Sincerely,

Gerome

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DP83867 PHY Power on reset duration