DP83TC812S-Q1: DP83TC812S-Q1 Bootstrap question

yang yanliang

Prodigy 150 points

Part Number: DP83TC812S-Q1

Hi TI team,

I have two questions about Bootstrap:

1. There is an RL resistor in the picture, but the mode description does not specify RL. What is the value?

2. Can we not configure the bootstap? Increasing the resistance will affect the EMC and Layout；

Looking forware to reply, thanks.

over 4 years ago

0 Vikram Sharma over 4 years ago

TI__Genius 16030 points

Hello,

RL is not required for any of the strap settings. You will need boot strap for non 0x0 PHY address. If your phy id of 812 can be programmed as 0x0 then you dont need any boot strap and all settings can be configured through register writes.

Regards,

Vikram

0 yang yanliang over 4 years ago in reply to Vikram Sharma

Prodigy 150 points

There is only one PHY IC on my PCBA，

So I can use 0X00 ID, right?

If is connected to the vehicle bus, Will it duplicate with other ECU IDs?

Thanks

+1 Vikram Sharma over 4 years ago in reply to yang yanliang

TI__Genius 16030 points

Every device on common MDC/MDIO bus should have a unique ID. So if on your ECU there is only device then you can select the address as 0x00. If you want to add more devices later then you may choose other unique addresses of those devices.

Regards,

Vikram

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DP83TC812S-Q1: DP83TC812S-Q1 Bootstrap question