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Re: PCI Legacy Mode - Why use subtractive decoding?

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Hi Kevin,

 

Thanks for the link. I have an OK understanding of PCI and PCIe and I'm not sure if I'd find the answer there.

 

Basically, why do the two virtual PCI - PCI bridges that get created in 'PCI Legacy Mode' have to use subtractive decoding? Why can't they just use positive decoding like normal PCI - PCI bridges.

 

What specific reasoning of standard PCI that requires subtractive decoding?

 

Kind Regards,

Robert


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