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zi data greater than device ram stm32f746

I'm doing a project that use all resources and options available in stm32f746 using its discovery board to create a smart controller
I did not reach half distance of my road and now the zi data is around 390 kb which is greater than actual device RAM
My question is does zi mean real places booked in RAM or just virtual according to program and when program run it will be deleted and over written like what happens in stack and heap ?
If yes real location then how is program still run and it show zi greater than device RAM
Note1 there is external RAM used for LCD buffering
How I can use that external RAM to increase total RAM for zi
Note2 I'm new in C and arm

Thanks

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