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altgxb in lock_to_reference mode

Altera_Forum
Honored Contributor II
‎12-26-2009 08:19 AM
988 Views

hello! 

I want to use the altgxb in lock_to_reference mode.  

From the handbook,the rx_pll_lock will be high and  

rx_freqlocked will be low.But when i simulate in modelsim, 

the rx_pll_lock and rx_freqlocked are high. why?
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