2010-12-09 00:59:09     BF527 interfacing to the SMSC LAN 921x in RMII mode without connecting the interrupt pin

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2010-12-09 00:59:09     BF527 interfacing to the SMSC LAN 921x in RMII mode without connecting the interrupt pin

Sada M (INDIA)

Message: 96572   

 

Hi,

 

Would like to know in BF527, is it possible to interface the SMSC LAN 921x in RMII mode without connecting the interrupt pin of this SMSC to the BF527 ? Is this pin used in linux ethernet driver development for any specific purpose ? If we remove this connections what would be the issues / limitations ?

 

 

 

From the SMSC Vendor we have below input from the SMSC chip perspective :

 

It is optional to use the interrupt pin.  I would recommend you to check with your software team if your driver wants to check the status of the PHY periodically, i.e. Link.  The driver can always perform pulling instead of interrupt driven.  So this is system dependent.

 

 

 

Is the SMSC LAN 921x driver in Linux/BF uClinux is using this pin ? If so is it mandatory to have this interrupt ? If mandatory can we do it by polling ?

 

Request to provide some inputs here. Thanks in advance.

 

 

 

Regards,

 

Sada.

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2010-12-09 02:21:26     Re: BF527 interfacing to the SMSC LAN 921x in RMII mode without connecting the interrupt pin

Aaron Wu (CHINA)

Message: 96573   

 

You should use the inttrupt, for heavy load interface like ethernet it's better to use intterrupt instead of polling. Yes we imeplement the interrupt, you can take the Lan9218 in BF548 Ezkit for reference.

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