DP83867IR: The register setting in case of fixed transmission speed without auto negociation

Ross san

Thank you for your advice!
OK, we will explain our customer to try changing the Master/Slave setting for 1G link in register 0x9h.

Kind regards,

Hirotaka Matsumoto

Ross san

Thank you for your DP83867IR's support always.
Our customer tried changing Master / Slave configuration using register 0x0009.
However, the result was the same(Link Up NG, transmission NG).
And, they tried three conditions as follows;
-Master condtion1 : MASTER / SLAVE MANUAL CONFIGURATION=1, MASTER / SLAVE CONFIGURATION VALUE=1
-Master condtion2 : MASTER / SLAVE MANUAL CONFIGURATION=1, MASTER / SLAVE CONFIGURATION VALUE=0
-Slave condition : MASTER / SLAVE MANUAL CONFIGURATION=0, MASTER / SLAVE CONFIGURATION VALUE=0

Please refer to the following file.
20170328_DP83867_RegisterSetting.pdf

<Question1>
In the first place, we noticed one point.
When we use 1000BASE-T, does Auto-Negociation absolutely require on the standard?
When their link partner is fixed setting(Master) and DP83867IR is fixed setting(Slave), is it possible to communicate?

And the datasheet P38 shows the following description.
"All 1000BASE-T PHYs are required to support Auto-Negotiation. The Auto-Negotiation function in 1000BASE-T has three primary purposes:"
-Auto-Negotiation of Speed & Duplex Selection
-Auto-Negotiation of Master/Slave Resolution
-Auto-Negotiation of Pause/Asymetrical Pause Resolution

<Question2>
On the Condition ②100Mbps : Link Up OK(it needs 10s until Link Up could operate), transmission OK, why does it needs 10s until Link Up operation?
It depends on link partner??

We appreciate your help always!

Kind regards,

Hirotaka Matsumoto

Ross san

Thank you for your reply and your support!

What happens when you change register 0x0h to allow for auto-negotitation? Does a 1G link establish?
->When our customer configure default setting of Auto negotiation setting, it was OK.

   So, when it is Link Up NG and transmission NG, after that,  our customer did not try changing register 0x0h to allow for auto-negotitation.

   We will confirm it.

What is your link partner part number? Have you tried using other link partners?
->Please refer to following contents.

<Contents>
①PC - 1G switching Hub - customer board with DP83867 
②PC - LAN cross cable - customer board with DP83867

(About configuration ①, according to 1G switching Hub(which has auto negotiation function), so we guess that the link could not be established.)

PC's setting is Full-Duplex, 1000Mbps, Master / Slave mode auto detection.
So, they confirmed with forced Master mode and Slave mode setting, however Link up was NG.

If you have some advice, could you let us know? 

Kind regards,

Hirotaka Matsumoto

Ross san

What happens when you change register 0x0h to allow for auto-negotitation? Does a 1G link establish?
->We could confirm it. As the result, yes. After changing register 0x0h to allow for auto-negotitation, 1G link established.1G link established.

So, Auto negotiation was OK perfectly.

We would like to confirm one point about Auto-MDIX.
Should we disable Auto-MDIX function?

Kind regards,

Hirotaka Matsutmoto

Ross san

Thank you for your reply.

And then, we really appologize that our explanation makes you confuse.

Our customer would like to use 1000Base-T with fixed slave mode or fixed master mode.(No using Auto-negotiation)
They could configure 1000Base-T with Auto negotiation, so we guess that there is no problem at hardware.

At the present, our customer could not configure fixed slave mode or fixed master mode yet.
The problem doesn't solve.

Now we ask them to disable Auto-MDIX function.

We appreciate your help always!

Kind regards,

Hirotaka Matsumoto

Ross san

Our customer confirmed with address 0x10, Bit6=0 and MDI configration, MDI-X configration both case.
However they didn't configure Link up with fixed slave 1000Base-T and fixed master 1000Base-T.
And then the condition is as follows;

<Condition>
DP83867 Master (CFG1 - 0x1a00) <---- CAT5E Cross cable ----> DP83867 Slave(CFG1 - 0x1200)

If you have some advice(for example status register,,,,), could you give us?
We need your help.

Kind regards,

Hirotaka Matsumoto

Ross san

Thank you for your reply and your cooperation!
We are looking forward your test result!

And, could you let us know how many days you need to confirm it?
And then, does 1000Base-T connection on IEE802.3 standard only adapt for auto-negotiation?

We really appreciate your help always.

Kind regards,

Hirotaka Matsumoto