DP83867ERGZ-R-EVM: 1000Mbps RGMII Mode setting Spec

Hello Kosaka

Thank you for the query.

 DP83867RRGZ has RGMII two kind delay modes. Aligned mode and Shift mode spec. Default setting is Aligned mode.

Your understanding is correct.

Question1. Aligned mode doen't work adjusteor function by Register(RGMIIDCTL) settings and resistor? 

Can you please explain this one more time.

Question2. Which pin is HW strap for it in DP83867RRGZ?

Align mode is default.

Regard,

Sreenivasa

Hello Kosaka

If customer is facing some issues and looking to solve using the RGMII delay control, Please share details.

Regards,

Sreenivasa

Hellow Sreenivasa

Question1. There is described "In Aligned mode, no clock skew is introduced."  at 8.4.1.1.2 1000-Mbps Mode Timing in DataSheet.

So I asked Is it possible to control the delay in Aligned mode.  This mean When we use delay function, we have to change the mode. 

What is different with Aligned mode and Shift mode?

Our system meet a receiver error and Idle Error at Phy so we investigage it.

BR,

Kosaka

Hello Kosaka

Thank you for the reply.

Align mode has the clock and data in phase.

If you need to change the delay you will have to use shift mode.

Regards,

Sreenivasa

Hello Sreenivasa

Thank you for infomation.

Delay function does not work in the Align mode.

What does the shift mode work without Data in phase? 

BR,

Kosaka

Hello Kosaka

Thank you for the reply.

I will restate the above sentence based on the datasheet

The timing paths can either be configured for Aligned mode or Shift mode. In Aligned mode, no clock skew is introduced. In Shift mode, the clock skew can be introduced in 0.5-ns increments (through strap configuration) or in 0.25-ns increments (through register configuration).

Regard,

Sreenivasa

Hello Streenivasa

Your mean diffrence is only delay function working with  Aligned mode or Shift mode.
Is my understanding correct?

BR,

Kosaka

Hello Sreenivasa

Thank you for the reply.

Sorry I forgot one quetion.

When will the chip reflect the Register(RGMIIDCTL) setting value? Run time? or need other action?

BR,

Kosaka