[Tinyos-help] about SPI in micaz OEM

[songangel]

Dr. Phil,
 
       Now I want to connect a device with SPI bus to Micaz OEM.
       Since in micaz OEM, the chip select pin of cc2420 is connected to the ground directly, which means the SPI bus is specially used for the cc2420.
       In your answers for spi in micaz as following 
       http://www.mail-archive.com/tinyos-help@millennium.berkeley.edu/msg20108.html
       http://mail.millennium.berkeley.edu/pipermail/tinyos-help/2007-February/022801.html      
  
       You said, using software resource arbitration, we can distinguish the different SPI slaves.
       But i feel strange, since the chip selection of CC2420 pin is fixed. Also data are sent to this new device with SPI but, which will also be sent to the cc2420. Then how to use software resource arbitration   to distinguish the cc2420 with this new device?
       Best regards,
 
       Jianxin    
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