DP83867IR: Link issue

Kai Hsiao

Guru 12675 points

Part Number: DP83867IR

Hi Sir

When DP83867 link up successful with 1G device ,May I know the register value about below register

I would like to compare with our register value

BTW 0x000A register value is 0000 ,is it correct ?

over 7 years ago

0 Ross Pimentel over 7 years ago

TI__Mastermind 23675 points

Hi Sir,

When trying to evaluate correct operation, you can use register 0x1.
This register should read 0x796D.

Register 0xA should not read 0x0 if you are resolving to 1G link.
Please see the description in the bit field.

0 Kai Hsiao over 7 years ago in reply to Ross Pimentel

Guru 12675 points

HI Ross

So far the PHY is still not workable

1. This is Xilinx reference design ZCU106 ,May I know this platform need to driver support ?

2. Our register as below ,have any register I need to set first ?

3. Transformer SPEC as below ,C2~C5 are 0.01uF ,is this value meet DP83867 ?

0 Ross Pimentel over 7 years ago in reply to Kai Hsiao

TI__Mastermind 23675 points

Hi Kai,

The cap value is not the issue here.
Those center taps cannot be shorted together for the DP83867IR.
Please see figure 30 in the datasheet.
Each center tap pin must have its own decoupling to ground and not shorted to any of the other center tap pins.

Here is a link to the 867 linux driver: git.kernel.org/.../dp83867.c

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DP83867IR: Link issue