Connection of AM3357 PRU RXLINK singals

Hi g.f,

On the ICE EVM v2.1 these signals are connected to the PHY signal named LED_SPEED. This board supports both industrial protocols that you ask about. However you haven't posted what PHY your customer is using.

Hi Biser,

Thank you for the repy.
Sorry, I don't have information which PHY the customer are going to use.

Yes, I checked the ICE EVM2.1 schematics and found it is connected to LED_SPEED.
So, this signal can be connect to LED_LINK or LED_SPEED if the PHY have these signal, is it correct?
If the PHY does not have LED_LINK/LED_SPEED signal, can "pr1_mii0_rxlink" and "pr1_mii1_rxlink" be left floating?

By the way, on AM437x IDK board, "pr1_mii0_rxlink" is connected to COL signal of TLK105L and Yellow LED of RJ45.
I understand that AM335x and AM437x are differenct device but it has same signal("pr1_mii0_rxlink") and connected to
different signal. So, I'm confusing little.

best regards,
g.f.

As these questions are also PRU firmware - related, I have asked the ISDK team to comment.

Hi Biser,

Thank you. I will wait for the comment.

best regards,
g.f.

Beckhoff provides an excellent Phy selection guide to assist in Phy selection and  configuration.

https://download.beckhoff.com/download/Document/io/ethercat-development-products/an_phy_selection_guidev2.3.pdf

This document also specifies the LED display requirements for Ethernet phy signals.

 

>> If the PHY does not have LED_LINK/LED_SPEED signal, can "pr1_mii0_rxlink" and "pr1_mii1_rxlink" be left floating?

Yes – however - then in tiescbsp,c,

in the function bsp_init, before calling bsp_pruss_mdio_init 

Set   mdioParamsInit.enhancedlink_enable = TIESC_MDIO_RX_LINK_DISABLE;

//This forces MDIO h/w state to a m/c based link detection

 

On the AM335x this signal is connected to the TLK110 LED_SPEED (pin 27).

The LED_SPEED indicates whether the link is AN_1 100Mb/s or 10Mb/s.

 The LED is ON when the link speed is 100Mbs and OFF when it is 10Mbs.

On the AM437x IDK EVM, a TLK105L phy is used. 

The TLK105l is a smaller 32 pin device compared to the larger 48 pin TLK110 device.

On the TLK105L, the COL (MLED)/PHYADD0  (pin 29) can be configured to output the Multi LED. 

The AM437x software configures this pin to output the Multi LED in mode 0x05.

As a result this pin outputs a high when the link speed is 100Mbs.

David

Hi David,

Thank you for the reply.
I understood for the EtherCAT application.

But my customer also making PROFINET application with AM3357.
In such case, can "pr1_mii0_rxlink" and "pr1_mii1_rxlink" be left floating as EtherCAT application?
Do they need to modify PRU firmware?If yes, which source file should be modified?

best regards,
g.f.

Hi David,

Is there any information about PROFINET which is my last question?

By the way, my customer are using EtherPHY which have LED_SPEED.
In there EtherCAT application, if LED_SPEED is High level it is indicating 100Mbps.
So, they can connect "pr1_mii0_rxlink" and "pr1_mii1_rxlink" without any modification of tiescbsp.c.
Am I correct?

best regards,
g.f.

Hi David,

Thank you for the reply.
I understood. So, in PROFINET the user can leave those signal pin floating and set the PINMUX to GPIO(output) or
can use as other function pin.

By the way, I'm searching the details about PRU_ICSS MDIO Link Register.
But I can't find from TRM and AM335x Datasheet. From TRM, address 0x4A33240C is reserved area.
Can you give me a details of this register?

best regards,
g.f.