- Chinese name
- Access cycle
- Foreign name
- AC；store access cycle
- Meaning
- Important parameters reflecting memory performance
- Definition
- The shortest time required to start two independent "read" or "write" operations in succession
- Classification
- Computer terminology
The two basic operations of the memory are "read" and "write", which means that Storage unit And storage register（ MDR ）Read and write between. The time interval between the memory receiving the read command and the time when the read information is stabilized at the output end of the MDR is called "access time TA". The shortest time between two independent access operations is called "storage cycle TMC". Semiconductor memory The access cycle of is generally 6ns~10ns. [1] The memory location is called "unit" for short. A spatial location for storing a machine word or a byte in memory. A memory is divided into several storage units, which are numbered in a certain order and called "address". For example, a storage unit stores a code with independent meaning. That is, a group of numbers stored for processing or operation as a whole is called "word". The length of a word, that is, the number of digits contained in a word, is called "word length". If the storage unit is divided by bytes, a machine word must be stored in several storage units. Once written, the contents of the storage unit remain unchanged despite repeated use. If new content needs to be written, the original content will be "washed out" and become the newly written content. [2]
Storage is also called "memory device". A device that can randomly access computing programs, original data, intermediate and final results at a certain address. The memory must store a large amount of data or programs Binary code Therefore, the organization of "access by address" divides it into many units (called "storage units") and numbers them in a certain order (called "addresses"), so that access by address can be based on the requirements of instructions. Storage capacity and access cycle are often taken as the main indicators to measure performance. [2] As one of the performance indicators of memory, it directly affects the technical performance of electronic computers. The shorter the storage cycle, the faster the operation speed, but the higher the requirements for storage components and processes. [2]
Access cycle
