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What is the functionality of the P2041 PCI Express Controller Core Clock Ratio Register (PEX_GCLK_RATIO)

Question asked by Jean-Paul Smeets on Jul 15, 2015
Latest reply on Jul 16, 2015 by Serguei Podiatchev

In P2040RM PCI Express Controller Core Clock Ratio Register (PEX_GCLK_RATIO) it states:

 

The PCI Express controller core clock ratio register is used to program the ratio of the

actual PCI Express controller clock frequency to the default controller core frequency

( 333 MHz ). This is required only when a PCI Express controller clock frequency other

than the default 333 MHz has to be used.

 

     -     What is the exact functionality of this register ?

     -     What happens if this is set incorrectly (actual PCI Express controller clock is 375MHz, numerator is 16) ?

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