第9章控制器-英文（课件）.ppt

Chapter 9 Controller 9.1 Function and organize of controller 9.2 Basic concept 9.3 Time-series generator and its control mode 9.4 Combinatorial logistic controller 9.5 Micro-program controller 9.1 Function and organize of controller Functions of controller control CPU control Memory control I/O Design trend Input, output and memory are using asynchronous control, do not rely on the central clock Using the distribution control, do not centralized control Using micro-program 9.1 Function and organize of controller Functions of controller 1、fetch instruction generate the address of next instruction in memory Working process of a computer: loop for fetch instruction-analysis instruction-execute instruction； Power on→generate reset signal→execute program→hall→power off ∴the main task of controller is to ensure instruction working in a safe and regular way 9.1 Function and organize of controller 2、analysis instruction Analysis the instruction that has been fetched. Give corresponding commands. Generate the address of operand if necessary. 9.1 Function and organize of controller 3、execute instruction Generate operation signal sequence according to operand and opcode. Based on CPU and I/O, every instruction can be executed, which include calculation the result and generation of the address of the next instruction. Program and data are importing to computer. The result is exporting. The abnormal thing is needed to be handled. Interaction is needed between human and computer. 9.1 Function and organize of controller 4、Control input of program and data and output of result Send commands to I/O system according program or human interface. 9.1 Function and organize of controller 5. Deal with abnormality and some request The abnormality is send by the following devices: (1) Interrupt request. When CPU has finished the current instruction, it turn to interrupt. Then back to program to execute the next instruction. (2)DMA request. When CPU finished the current mach