What do you mean by memory address decoder?
Address decoding refers to the way a computer system decodes the addresses on the address bus to select memory locations in one or more memory or peripheral devices. The 68000's 23-bit address bus permits 223 16-bit words to be uniquely addressed.
The instruction decoder of a processor is a combinatorial circuit sometimes in the form of a read-only memory, sometimes in the form of an ordinary combinatorial circuit. In our example computer, the input to the instruction decoder is the low 5 bits of the data bus, for a total of 32 different instruction codes.
- An instruction cycle (also known as the fetch–decode–execute cycle or the fetch-execute cycle) is the basic operational process of a computer. It is the process by which a computer retrieves a program instruction from its memory, determines what actions the instruction dictates, and carries out those actions.
- Pipelining is an implementation technique where multiple instructions are overlapped in execution. The computer pipeline is divided in stages. Each stage completes a part of an instruction in parallel. We call the time required to move an instruction one step further in the pipeline a machine cycle .
- The control unit (CU) is a component of a computer's central processing unit (CPU) that directs the operation of the processor. It tells the computer's memory, arithmetic/logic unit and input and output devices how to respond to a program's instructions. Most computer resources are managed by the CU.
Updated: 23rd September 2018