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Dynamic Random Access Memory (DRAM). Part 1: Memory Cell Arrays

This is the first in a series of computer science videos is about the fundamental principles of Dynamic Random Access Memory, DRAM, and the essential concepts of DRAM operation. This particular video covers the structure and workings of the DRAM memory cell. That is, the basic unit of storage capable of storing a single binary digit, a 1 or a 0. You will see that a DRAM memory cell is comprised of a single pass transistor connected to a single capacitor. You will also see the way that these cells are arranged in a large rectangular array connected by thousands of bit lines and word lines. In addition, you will learn about the role of differential sense amplifiers when it comes to reading and writing data to such an array. In the videos that follow, you will find out more about the way DRAM cells are addressed, and how they are organised, so that it is possible to store bytes and words rather than just single bits.