1.9 - Classification of memory

Catalog

One 、 Memory classification

Two 、 By addressing

1、 Ram

2、 Sequential memory

3、 Direct memory

3、 ... and 、 Access by content

1、 Associative memory

Four 、 Test method 1： Memory classification

---

One 、 Memory classification

Two 、 By addressing

1、 Ram

• Random access memory has an address on its cell ;
• Access any unit of ram , It takes the same amount of time ; That is to say, it takes the same time to read data from any unit ;
• Typical representative of - Memory ;

2、 Sequential memory

• There is no address on the sequential storage device ; So when writing data, it is written to the sequential memory in sequence ;
• So if you want to read the data in the sequential memory , Must read from the beginning ;
• Typical representative of - Magnetic tape ;

3、 Direct memory

• There is an address on the direct memory device ;
• But the time of reading data is related to the relative position of the head and the data , So the time of reading data is different ;
• Typical representative of - Mechanical drive ;

3、 ... and 、 Access by content

1、 Associative memory

Four 、 Test method 1： Memory classification