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Introduction
Hello. I'm learning about memory every day, inspired by my senior engineer mentor. This is Tot.
This time, I will write about the working principle of memory.
light? lead?
I investigated the write and read operations of DDR3-SDRAM. Below is the structure of the DRAM.
A DRAM cell consists of one transistor and one capacitor.
(Note) The above diagram is an image diagram.
light
Write High
1. The word line and bit line voltage are high.
2. By increasing the voltage of the bit line, a current flows from the word line and charges accumulate in the capacitor.
Write Low
1. Raise the voltage on the word line and pull the bit line low to release the charge on the capacitor so that there is no charge.
lead
Load High
1. Bring the word line high and the bit line low.
2. By releasing charge from the capacitor, the potential of the bit line rises and is determined to be High.
Read Low
1. Bring the word line to the high state.
2. Since there is no electric charge in the capacitor, current does not flow, and the bit line voltage does not change, so it is determined to be Low.
short story
Me: "What is refresh action? 』
Senior: "What happens if you leave the battery unattended? 』
Me: "It will discharge naturally. ’ I agreed.
Senpai: "Correct! Capacitors, like cellphone batteries, gradually lose their charge and need to be recharged. That's the refresh action. 』
The refresh operation retains data by recharging the cell's capacitors.
I understand how memory devices work, but I wondered how memory and FPGAs interface, so I decided to investigate.
Summary of this time
■ Memory is a place where data is temporarily stored.
■DRAM consists of one transistor and one capacitor cell.