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The role of ethos-u55/65 shared buffer


I would appreciate it when someone tell me the role of ethos-u55/65 shared buffer. I've read the implementaton of vela to suppose that the role is to hold ONE set of IFM/IFM2/OFM blocks (+LUT etc), for example, it holds one IFM block and one OFM block in Conv2D operation, but I'm not sure if it is: If it is true, I cannot understand the role of NPU_SET_BLOCKDEP. If there is only one IFM and one OFM in the shared buffer, why the NPU have to takes care of block dependency whose value is 2 or 3?

Best regards,