Cache Memory.ppt
- 1. Computer & Information Technology • Course Code: 510113 • Course Teacher: Jarin Tasnim Lecturer (Computer & Information Technology) Crown Institute of Business And Technology
- 3. What is Cache Memory? Cache memory is a small-sized violate computer memory that provides high speed data access to a processor and stores frequently used computer programs, applications and data. It stores and retains data until a computer is powered up.
- 4. Function of Cache Memory Small amount of fast memory. Sits between normal main memory and CPU. May be located on CPU chip or module. CPU Cache Main Memory
- 5. Working of Cache Memory The CPU initially looks in the cache for the data it needs. If the data is there, it will retrieve it and process it. If the data is not there, then the CPU accesses the system memory and then puts a copy of the new data in the cache before processing it. Next time if the CPU needs to access the same data again, it will retrieve the data from the cache instead of going through the whole loading process again.
- 6. Levels of Cache Memory There are three types of cache memory. 1. Level 1 (L1) Cache 2. Level 2 (L2) Cache 3. Level 3 (L3) Cache
- 7. Level 1 (L1) Cache L1 cache is the fastest cache and it usually comes within the processor chip itself. The L1 cache typically ranges in size from 8KB to 64KB and uses the high-speed SRAM instead of the slower and cheaper DRAM used for the main memory. It is referred as internal cache or primary cache.
- 8. Level 2 Cache L2 cache is larger but slower in speed than L1 cache. It stores recently accessed information and also known as secondary cache. It is designed to reduce the time needed to access data in case where data has already been accessed previously. L2 cache comes between L1 and RAM and it is bigger than the primary cache (typically 64KB to 4MB).
- 9. Level 3 Cache L3 cache is an enhanced form of memory present on the motherboard of the computer. L3 cache is a memory that is built into the motherboard. It is used to feed the L2 cache and typically faster than the system’s main memory. But still slower than the L2 cache having more than 3MB of storage in it.
- 11. Thank You