DP83826I: Link Pulse polarity

Ryuuichi machida

Part Number: DP83826I
Other Parts Discussed in Thread: TLK105

Hello,

Let me confirm below just in case.

* Is my understanding default link pulse polarity of this device is "positive polarity" correct ?
If default link pulse polarity is "negative polarity", is there any way to change this polarity by using register ?

Best Regards,

11 months ago

0 Hillman Lin 11 months ago

TI__Mastermind 22495 points

Hi Ryuuichi,

Our PHY automatically correct the polarity on the MDI side. If you want to change the polarity manually, register 0x000B bit[6] could help.

Regards,

Hillman Lin

0 Ryuuichi machida 10 months ago in reply to Hillman Lin

Guru 11790 points

Hello Lin-san,

Let me confirm about below.

>If you want to change the polarity manually, register 0x000B bit[6] could help.
Is my understanding when user set 0x000B[6] to "1", TD and RD are swapped correct ?
(This means user can connect MDI-MDI without cross cable. (In other word, user can use straight cable same as MDI-MDI-X connection.))

Best Regards,

+1 Hillman Lin 10 months ago in reply to Ryuuichi machida

TI__Mastermind 22495 points

Hi Ryuuichi,

Our PHY support both cross cable and straight cable. It has auto polarity correction.

Regards,

Hillman Lin

0 Ryuuichi machida 10 months ago in reply to Hillman Lin

Guru 11790 points

Hello,

I understood that I do not take care polarity of link pulse for this device.
Thank you for your support.

BR,

0 Ryuuichi machida 10 months ago in reply to Ryuuichi machida

Guru 11790 points

Hello,

I'm sorry I have following question finally.

* Is my understanding that default link polarity of DP83826 is NOT "reversed polarity" correct ?

According to datasheet of old device TLK105, there is following description.
>Note that the default transmit link pulse polarity for the TLK10xL is reversed.
However, I could not find similar description from datasheet of DP83826, so I think default link polarity is "Non-reversed polarity".

BR,

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DP83826I: Link Pulse polarity