In case of failure in the Electronic Flight Instrument System, how would they be transferred between each other? In EFIS, in case of failure in the PFD, where would be PFD shown? In case of failure in the ND, where it would be shown? In case the PFD &amp; ND both fail, where would they be shown?
On the Embraer 170/190-series, the normal display layout is as follows:



There is an automatic display reversion logic when one or more panels fail. The following image shows this logic:


There is also a manual reversion switch located near each pilot's outboard knee, which controls what is displayed on the panel:



All images sourced from an Embraer Airplane Operations Manual.