#SRAM type memory is integrated directly into the CPU chip.
System used by SRAM:
1. Cache between CPU and main memory.
2. CPU internal L1/L2 or external L2 cache.
3. COAST cache for CPU external expansion.
4. CMOS 146818 chip (RT&CMOS SRAM).
Introduction to several types of memory:
1. Read-only memory (ROM)
ROM stands for Read Only Memory, when manufacturing ROM , the information (data or program) is stored and saved permanently.
This information can only be read and generally cannot be written. Even if the machine is powered off, the data will not be lost. ROM is generally used to store basic computer programs and data, such as BIOS ROM.
Its physical appearance is generally a dual in-line plug-in (DIP) integrated block.
2. Random Access Memory (RAM)
Random Access Memory (Random Access Memory) means that data can be read from or written to. When the machine is powered off, the data stored in it is lost.
The memory module we usually purchase or upgrade is used as computer memory. The memory module (SIMM) is a small circuit board that collects RAM integrated blocks. It is inserted into the memory slot of the computer. to reduce the space occupied by the RAM integrated block.
Common memory modules currently on the market include 1G/stick, 2G/stick, 4G/stick, etc.
3. Cache (Cache)
Cache is also a concept we often encounter, which is the commonly seen first-level cache (L1 Cache) and second-level cache (L2 Cache). , Level 3 cache (L3 Cache) data, which is located between the CPU and the memory, is a memory that reads and writes faster than the memory.
When the CPU writes or reads data into the memory, this data is also stored in the cache memory.
When the CPU needs the data again, the CPU reads the data from the cache memory instead of accessing the slower memory. Of course, if the required data is not in the Cache, the CPU will read the memory again. data in.
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