Method for making a memory device with plural substrates each having a memory array, a read only memory, and a write state machine

A method for making a memory device includes forming or fabricating on a first substrate a first array of memory cells, a first read only memory, and a first write state machine which receives instructions from the first read only memory for operating the first array of memory cells. The method further includes forming or fabricating on a second substrate, a second array of memory cells, a second read only memory, and a second write state machine which receives instructions from the second read only memory for operating the second array of memory cells.