TM4C1294 External PHY CLOCK(25MHz) via PM4 - How to set up any Ethernet PHY registers for PM4 pin(GPIO)

Hello Ay0689

Is the requirement still to use the internal PHY or do you plan to use an external PHY?

Regards
Amit

Hello, Amit-san,

If possible, I still use the INTERNAL PHY.

Our Tiva Clock(MOSC) configration is as follows,
MOSC is connected to 24.576MHz Crystal.

The purpose of these clock configration is for Tiva-I2S Audio codec connection.
Tiva is the I2S Master device and also has to supply 24.576MHz Clock to the CODEC.
Some Logic devices are added between Tiva and Codec device to convert I2S <-> SSI signals.

Therefore, we have to supply 25MHz clock to PM4-pin in order to operate both the Ethernet and the Audio Codec .

Do you have any set-up info. to supply 25MHz Clock to the INTERNAL PHY via PM4 ?

Best regards
ay0689

Hello Ay0689,

The use if PM4 clock pin is only for the RMII mode which uses an external PHY. The use of PM4 for Internal Phy or External PHY with MII is not allowed by the data sheet.

Regards
Amit

Hello, Amit-san,

Thank you for your prompt reply. I understand your answer. 

As the result, we abandon to use PM4-pin as INTERNAL PHY 25MHz Clock-input.

When we use Tiva by I2S master operation on our system, I understand that we can not use the INTERNAL PHY,( i.e. TM4C1294 Ethernet I/F).

But if we use Tiva with I2S Slave operation on our system, we can use the Ethernet peripheral ordinarily.

 

By the way, does TI have a plan to release New Tiva device that has both I2S PERIPHERAL and Ethernet MAC/PHY?

We still have many issues to upgrade our LM3S I2S/Ethernet equipment to new TM4C1294 system...

We need new Tiva device that includes the I2S peripheral.

Best regards,

ay0689

 

 

Hello Ay0678,

Adding back I2S is not planned for TM4C129 device in the immediate time frame. You can however evaluate using SSI for emulated I2S. There is an application note on the tm4c12x web page.

Regards
Amit