Module 1756-EN2T
execute the instruction stage (EX, execute), the specific realization of the function of the instruction. The different parts of the CPU are connected to perform the required actions. Square access number stage (MEM, memory), the root instruction needs to access the main memory, read the operand, the CPU gets the operand address in the main memory, and reads the operand from the main memory for operation. Some instructions do not need to access main memory, so this stage can be skipped.

1, user-centered basic design principles
In the process of system design, designers should grasp the characteristics of users and discover the needs of users. In the whole development process of the system to constantly seek the user’s opinion, to consult the user. The design decision of the system should be combined with the user’s work and application environment, and understand the user’s requirements for the system. A good way to do this is to involve real users in the development, so that developers can properly understand the needs and goals of users, and the system will be more successful.