I can not fully understand what section of the available external memory is safe to assign for a VDMA on the ZC702 board. I need to dedicate 4MB of memory for the three frames (640*480* 4bytes * 3 frames aligned memory). According to UG585 in Chapter4 table4-1 page 113,
it is clear that I should not use any memory for the VDMA in the 0x4000_0000 to 0xFDFF_FFFF. But which of the 0x0000_0000 to0x3FFF_FFFF would be the most "safe" to dedicate for my frames? Does it matter?