Associative memory is a type of computer memory that allows data to be accessed based on its content rather than its address.
In other words, associative memory allows a computer to retrieve data by searching for a key value or tag that is associated with it.
Address space and memory space are important concepts in virtual memory systems. In a virtual memory system, the computer’s operating system divides the available physical memory into smaller sections called pages. Each page has a unique address in the virtual address space. When a program accesses memory, it uses virtual addresses, which are then translated by the memory management unit (MMU) into physical addresses.
The address space is the set of all possible virtual addresses that a program can use. Each process has its own address space, which is isolated from other processes. This allows each process to use virtual addresses as if it had its own physical memory, even if the physical memory is being shared among multiple processes.
The memory space, on the other hand, is the set of all possible physical memory addresses. In a virtual memory system, the memory space is divided into pages, each of which has a fixed size. The MMU maps virtual addresses to physical addresses by using a page table, which is a data structure that stores the mapping between virtual addresses and physical addresses.