Chapter 9

General descriptions of a Memory ChipAddress Connectionsare used to select one of the memory location within the deviceData Connectionsare used to enter information to be stored in a memory location and also to retrieveinformation read from a memory location.Manufacturers list their memory as, for example, 4K x 4, which means that the devicehas 4K memory locations (4096) and 4-bits are stored in each location.Selection ConnectionsMemory selection is accomplished via a chip selection pin (CS) on many RAMs or a chipenable pin (CE) on many EPROM or ROM memories ( see example in next slaids )Control ConnectionsMemory function is selected by an output enable pin (OE), for reading data.For writing data, memory function is selected by the write enable pin (WE).Address[log 2 (K)-1:0]K x NCSOEWMEMData[N-1:0]