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[partial-reconfig] About the ICAP for V4



Hi everyone,

  Recently, I make some researches about partial reconfiguration of V4, and I know there are two ICAP sites in the V4 chip, but can not be activate at the same time.
But why cann't they be activate at the same time? I think the answer may be in the architecture of the Virtex 4, and I want to know how ICAP is connected to the configuration memory and how many ports does the configuration memory have? one or two?
 
Thank you!
 
Dong DH