From the Virtex 4 documentation (Configuration Guide, Users Guide) I learned that this family can be configured during runtime in the granularity of single frames. The frames which have a fixed size for all members of this family. Additionally the documents state that there is a tiled placement of those frames.
For Virtex II the frames started at the topmost CLB and ended at the bottom of the FPGA. This does not seem to be the case with Virtex 4 devices.
This brings me to the question if it is now possible to configure a part of the FPGA which looks like e.g. a rectangle consisting of whole frames. Having neighbour frames at all four sides of that rectangle which are operating during that reconfiguration process.
I'm having a picture of a matrix-style arrangement of all the frames in mind where I can select a set of them which are to be reconfigured. Unfortunately I didn't find any figure in the docs which gives me a hint on that.
Could anyone comment on this?