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Fixing smsc91c111 to 10Base-T.

Altera_Forum
Honored Contributor II
‎08-02-2010 08:36 AM
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I've built a prototype board which includes the Cyclone III + smsc91c111 ethernet chips. 

 

Under Quartus-II version 9.0 + Nios II + muCOS-II + smsc91c111, the auto-negotiation fails during initialization of the driver. Could you tell me how to modify the driver so the chip skips the auto-negotiation, and fixes to 10Base-T (or 100Base-T)? 

 

Thanks.
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Altera_Forum
Honored Contributor II
‎08-05-2010 08:12 AM
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Hi Mhori, 

Search IP device drivers for the file smsc_phy.c. 

You'll find the s91_phy_init() function which performs auto negotiation. 

With minor changes you can: 

- skip auto-negotiation 

- ignore negotiation errors 

- force the link speed  

In the first two cases you must ensure your system can restart auto-negotiation when needed. 

 

Cris
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