DP83867IR: "RGZ RGMII Transmit/Receive Clock Skew" and "RGMII Transmit/Receive Clock Delay"

Yusuke Mukuno

Part Number: DP83867IR

Q1.

Could you please let me know the difference between "RGZ RGMII Transmit/Receive Clock Skew(datasheet P48)" and "RGMII Transmit/Receive Clock Delay(P88)"?

Q2.

Which is correct the value of RGZ RGMII Transmit/Receive Clock Skew at mode5 in the datasheet and the value in RGMII Interface Timing Budgets?

Datasheet (Value = 0ns)

http://www.ti.com/lit/ds/symlink/dp83867ir.pdf

RGMII Interface Timing Budgets (Value = 4.0ns)

http://www.ti.com/lit/an/snla243/snla243.pdf

Muk

over 6 years ago

0 Geet Modi over 6 years ago

TI__Mastermind 26320 points

Hi,

Q1 : DP83867 offers RGMII Clock/Data skew control thru HW straps as well thru register configuration. P44 describes how to use straps to control the delay. P88 describes how to control using register configuraiton.

Q2: Please refer to datasheet.

Regards,
Geet

0 Ben Hershey over 6 years ago in reply to Geet Modi

Prodigy 50 points

Geet,

I have this same question. Are you saying that Clock Skew and Clock Delay are the same thing?

Regards,

Ben

0 Geet Modi over 6 years ago in reply to Ben Hershey

TI__Mastermind 26320 points

Hi,

RGMI specs requires the Data and Clock shall have delay/skew of 2 ns at reciever.

Regards,
Geet

0 Geet Modi over 6 years ago in reply to Geet Modi

TI__Mastermind 26320 points

Hi,

I am closing this thread. Incase you need further assistance, please open new thread and provide reference to this thread.

Regards,
Geet

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DP83867IR: "RGZ RGMII Transmit/Receive Clock Skew" and "RGMII Transmit/Receive Clock Delay"