sentences:  A system that provides the row address (and the refresh command) does so to have greater control over when to refresh and which row to refresh.This is done to minimize conflicts with memory accesses, since such a system has both knowledge of the memory access patterns and the refresh requirements of the DRAM.When the row address is supplied by a counter within the DRAM, the system relinquishes control over which row is refreshed and only provides the refresh command.