DP83822I: How to switch the mode from MII to RGMII ?

Yue TANG

Part Number: DP83822I
Other Parts Discussed in Thread: ETHERNET-SW

Hi,

My customer used DP83822I and driver from below link. They want to know what's default mode in the driver, MII or RGMII? if MII,How to do to switch to RGMII? thanks.

over 7 years ago

0 Ross Pimentel over 7 years ago

TI__Mastermind 23675 points

Hi Yue,

The default configuration is MII.
They can change from MII to RGMII through either hardware (bootstraps) or using MDIO/MDC (register access).
Register 0x17 contains the control for configuring either MII, RMII or RGMII.
To configure the PHY for RGMII with TX/RX delay, please set register 0x17 to the value 0x1241.

0 Yue TANG over 7 years ago in reply to Ross Pimentel

TI__Genius 9045 points

Hi Ross,
Thanks . on e further question, do you know how to change the mode in the linux driver TI provided？

0 Ross Pimentel over 7 years ago in reply to Yue TANG

TI__Mastermind 23675 points

Hi Yue,

The linux driver would need to be modified to include a definition of register 0x17 or you could implement a write command to register 0x17 to override the bootstrap value.

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DP83822I: How to switch the mode from MII to RGMII ?