DP83867IR: Connection with RJ45

Shunsuke Nagata

Part Number: DP83867IR

Hi,

My customer would like to know below connection between DP83867 and RJ45 terminal.

DP83867 PIN	RJ45
TD_P_A	6
TD_M_A	3
TD_P_B	2
TD_M_B	1
TD_P_C	8
TD_M_C	7
TD_P_D	5
TD_P_D	4

Is it possible to connect above connection?

The connection between EtherPHY and RJ45 Usually connect as below,:

However, DP83867 EVM connection are below:

In EVM, the order of PIN number of RJ45 is opposite from normal connection. For example, PIN 1 of RJ45 connects to TD_D_N but the PIN1 connect to TD_P_A. It looks like DP83867 can automatically detect and connect for both case, then, customer would like to know if the device can automatically detect and connect his own connection.

Regards,
Nagata.

over 4 years ago

0 Cecilia Reyes over 4 years ago

TI__Genius 9920 points

Hi Nagata,

The reason on the EVM it is backwards is because it is actually enabled for Mirror mode. You can review more about the settings in our datasheet but that is why we were able to change the polarity.

Thanks,

Cecilia

0 Shunsuke Nagata over 4 years ago in reply to Cecilia Reyes

TI__Genius 12570 points

Cecilia,

Thank you for your support.

The 1-pin of RJ45 usually connect to TD_P_A (positive input) but the 1-pin connect to TD_M_D(negative input) in EVM.

Will DP83867 judges the polarity (positive input or negative input) by WIRE_CROSS bit?

Regards,
Nagata.

0 Cecilia Reyes over 4 years ago in reply to Shunsuke Nagata

TI__Genius 9920 points

That is correct. That bit will let you know the polarity of your signals and whether or not they are reversed.

Thanks,

Cecilia

0 Shunsuke Nagata over 4 years ago in reply to Cecilia Reyes

TI__Genius 12570 points

Cecilia,

Does the WIRE_CROSS bit work for only 1000Mbps? Does it work for 10/100Mbps?

Regards,
Nagata.

0 Cecilia Reyes over 4 years ago in reply to Shunsuke Nagata

TI__Genius 9920 points

Nagata,

Based on the datasheet it states it is only used in 1000M .

Thanks,

Cecilia

0 Shunsuke Nagata over 4 years ago in reply to Cecilia Reyes

TI__Genius 12570 points

Cecillia,

Datasheet shows the bit support 1000M. But I would like to know if the feature can support 10/100, too. I guess the check polarity should be same as 1000M and 10/100M. Could you please check if it work in 10/100M with EVM or degisn?

Regards,
Nagata.

0 Cecilia Reyes over 4 years ago in reply to Shunsuke Nagata

TI__Genius 9920 points

Nagata

Bit 1 - Polarity Status should provide you with this information for those speeds.

Thanks,

Cecilia

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DP83867IR: Connection with RJ45