CN101261783A - A Simulation Experiment System of "Principles of Computer Composition" - Google Patents

Abstract

A simulation experiment system of Principles of Computer Composition comprises a single module experiment simulation subsystem and a whole machine experiment simulation subsystem, wherein the single module experiment simulation subsystem includes a register group module simulation unit, an universal register module simulation unit, an arithmetic unit module simulation unit, a memory and bus module simulation unit, an instruction unit simulation unit, a microprogrammed controller module simulation unit and a sequence and start-stop module simulation unit; the single module experiment simulation subsystem includes an initial module, a switch button detection module and a switch motion operating module; the whole machine experiment simulation subsystem includes an initial module, an operational mode identification module, an instruction fetch module, an instruction analysis module and an instruction executing module. The invention provides a simulation experiment system of Principles of Computer Composition which is cost-cutting and can effectively meet the all requirements of assistant teaching experiments.

Description

A Simulation Experiment System of "Principles of Computer Composition"

technical field

The invention relates to a simulation experiment system.

Background technique

The existing experimental methods for the course "Computer Composition Principles" mainly include:

(1) The form of the hardware experiment instrument: a computer module composed of circuits. In the experimental teaching, the operation of the circuit is provided to obtain the experimental effect. Most of the current college teaching adopts this method.

Problems and disadvantages: Experimental teaching must purchase experimental equipment, which is expensive, and the maintenance cost of experimental equipment is high. The failure of experimental equipment will affect the teaching effect.

(2) Combination form of hardware experiment instrument and software program: use computer module composed of circuit, provide operation to circuit in experimental teaching, obtain experimental effect, and use supporting software to obtain data from hardware experiment instrument at the same time, display on the software interface experimental effect. This way the interface is intuitive. Some colleges and universities use this method.

Problems and disadvantages: The software must rely on the hardware tester to use, and cannot be used when the tester fails. The problems and shortcomings are the same as the first method.

(3) Pure software simulation form: use software to realize the functions of computer hardware modules, and users operate virtual hardware on the software interface to obtain experimental results. This method has no hardware laboratory investment costs and maintenance problems, simple operation, intuitive interface, and can ensure the effect of experimental teaching. There is currently no such complete product. Some university teachers have developed software that simulates a certain module (such as arithmetic unit hardware), but they do not have a complete product that simulates a computer.

Problems and disadvantages: The simulation of only a part of the modules still requires the use of experimental equipment, which is costly and cannot assist in solving all the requirements of teaching experiments.

Contents of the invention

In order to overcome the high cost of the existing "Principles of Computer Composition" experimental equipment and the inability to assist in solving all the requirements of the teaching experiment, the present invention provides a simulation experiment of "Principles of Computer Composition" that reduces costs and effectively assists all the requirements of the teaching experiment system.

The technical solution adopted by the present invention to solve its technical problems is:

A "Computer Composition Principles" simulation experiment system, including a single-module experiment simulation subsystem and a complete machine experiment simulation subsystem, the single-module experiment simulation subsystem includes a register group module simulation unit, a general-purpose register sending module simulation unit, and an arithmetic unit Module simulation unit, memory and bus module simulation unit, instruction component simulation unit, microprogram controller module simulation unit and timing and start-stop module simulation unit, the single module experiment simulation subsystem includes: initialization module, for setting each object Visible or not, set the initial value of the variable, the object includes the hardware chip, the operation switch and the information channel between modules, the variable includes the value of the hardware chip, the signal value of the operation switch, the signal value on the information path, and the meaning of the control signal represented by the operation switch , the direction of information transmission; the switch button detection module is used to automatically detect the button element in the flash, which will trigger an action, write code in this action, and judge whether it is a data switch or a control signal switch; the data switch operation module is used to display The data is input to the information flow animation of the experimental module, and the data switch value is assigned to the module hardware chip value;

The switch action operation module is used to judge whether the control signal is valid for the experimental module according to the definition of the module signal, and if it is valid, execute the function code of the module to complete the required function. If not, the module does not run; the complete machine experiment simulation subsystem includes:

The initialization module is used to initialize all objects and variables on the whole machine interface;

The running mode identification module is used to detect the running button, judge whether to press the micro single step button or the full speed button, and set the running mode flag variable;

The instruction fetch module is used to assign the value to the current address value of the memory, check the memory data array according to the current address value of the memory, obtain the current data value of the memory, and transfer this value to the instruction register; the current address value of the memory, the current data value of the memory, the instruction The register value is displayed by the indicator light;

The analysis command module is used to obtain the micro-address of the micro-program corresponding to the command according to the value of the command register, and use the micro-address as the subscript of the micro-program memory array to find the first micro-command of the micro-program. The code of each module is the control signal of each module. According to the micro-command code, the control signal is sent to the modules involved, and the module completes the corresponding function according to the control signal; the display lamp displays the micro-command value, micro-address value, and the value of the control signal light of each module;

The execution command module is used to transmit control signals to each single module editing according to the obtained micro instructions, that is, each single module editing obtains a combination of control signals. If the control signal is valid, the module realizes its own function, and the execution result is reflected in the hardware chip. in the variable.

As a preferred scheme: described register group module simulation unit, general-purpose register module simulation unit, arithmetic unit module simulation unit, memory and bus module simulation unit, instruction component simulation unit, microprogram controller module simulation unit and timing And the simulation unit of the start-stop module is developed by flash Actionscript_, published in the form of HTML, and the organization of the experimental system is connected in the form of HTML hyperlinks.

The technical idea of the present invention is: the development platform of the system stand-alone version is Macromedia flash 8. Experiments are organized together using HTML hyperlinks. This system does not need to be installed on the computer, it can be run directly. The operating environment is a browser with a flash player plug-in (the plug-in comes with IE 6 and above). The system network edition development platform of the present invention is Macromedia flash 8, ASP. The system needs IIS environment to run.

The software of the present invention provides a list of hyperlinks for completing the experiment selection through the HTML page. Experiments performed by users based on content choices. Experiment 1 to Experiment 7 are single-module experimental operations, and Experiment 8 is the whole machine experimental operation. Each experiment includes an Experiment Instructions document.

Experiment 1 is the simulation of the register bank module

The second experiment is the general register module simulation

The third experiment is the simulation of the arithmetic unit module

Experiment 4 is memory and bus module simulation

The fifth experiment is the simulation of the instruction component module

Experiment 6 is the simulation of the microcontroller module

Experiment 7 is timing and start-stop module simulation

Experiment 8 is the comprehensive simulation of the whole machine

The user selects the experimental item to be carried out from the experimental list, reads the experimental guidance document, understands the basic operation principle and steps of the experiment, and then enters the simulation experiment machine interface to complete the operation. The interface of the simulation test machine is based on the photo of the real test machine, which can give the operator a strong sense of reality. The hardware modules involved in the experiment and the logic circuits of the modules are identified and drawn to realize the combination of virtual and real.

The experimental guidance document is in the form of HTML static page.

There are two types of simulation test machines, single-module test simulation and comprehensive test machine simulation.

1. Single-module experimental simulation, including

1.1. Single module experiment simulation function

The operator can operate the input switch by connecting the wires required by the experiment to provide data, address and control signals to the experiment module. When connecting, the user clicks the designated signal jack and input switch jack with the mouse, and the connection line appears on the interface. If the connection is not correct, no signal line will appear.

After the connection is completed, the user can operate the experimental module. Click the switch with the mouse, the switch will change accordingly, the indicator light on the switch will be on and off to indicate the data "1" and "0", and the animation representing the signal transmission will be demonstrated, and the user can see the high and low levels provided by their own operations The signal is transmitted to which specific chip. During the experiment, you can move the mouse to the chip, and the data value inside the chip will be displayed in binary form. The working logic of the module fully simulates the working condition of the hardware, and the chip performs different operations on different combinations of control signals.

The yellow signal flow animation represents the data information transmission route, and the red signal flow represents the chip pin that the control signal switch provides a high level delivery connection. The values on the data switch display lamp, control switch display lamp, and bus display lamp are consistent with the display form of the experimental instrument. In addition, you can directly click on the chip in the module to query the data value in the chip. For chips with many functions, prompt information is also displayed to remind the user which function of the chip is selected by the given control signal.

1.2. Single-module simulation design idea

In the single-module experiment, the objects and relationships involved are:

1) Objects: hardware chips, operation switches, and information pathways between modules.

2) Attributes: hardware chip value, signal value of the operation switch, signal value on the information path, meaning of the control signal represented by the operation switch, direction of information transmission (determining the animation form), and functions completed by the hardware chip.

3) Action: The control meaning of the operation switch reaches the hardware chip through the information transmission path, and the hardware chip starts the internal function to realize.

Simulate the initial state of the experimental machine. After the user operates the operation switch, the experimental machine will switch to the data transmission and hardware function running state, and the control function of the switch will be reflected at any time.

Corresponding to single-module simulation analysis, we create instances of each object in flash. Operable objects in Flash include graphics components, movie clip components, and button components. The hardware chip is represented by graphic components, the attribute value is represented by the dynamic variable value associated with the graphic components, the information transfer action is represented by movie clip component animation, and the operation switch action is represented by button components.

Flash ActionScript programming ideas:

(1) The initialization operation is completed in the first frame, including whether each object is visible and the variable initial value setting

(2) Switch button detection: In the flash, the button element is automatically detected, which will trigger the on (press) action. Write code in this action to determine whether it is a data switch or a control signal switch

(3) If it is a data switch operation, display the animation of the information flow of data input to the experimental module. And assign the data switch value to the module hardware chip value.

(4) If it is a control switch operation, according to the definition of the module signal, judge whether these control signals are valid for the experimental module, and if it is valid, execute the function code of the module to complete the required function. If not, the module does not run.

2. Simulation of the whole machine test machine

2.1 The function of the simulation of the whole machine experimental machine

The whole machine experiment is to connect all the modules together through the bus to become a complete computer. The experimental task is to use the command system of the model machine to compile the program, run the program at full speed, single step or micro single step on the experimental machine, and complete the program function. The program result can be measured or read from the hardware chip to the display lamp for viewing.

The comprehensive machine simulation content includes 2 parts:

The first part is the simulation of the process that the user-input self-compiled assembly-level program is converted into binary code and stored in memory.

Part 2 is the simulation of the program code micro-step or full-speed operation process in memory.

2.1.1 Assembler compilation process simulation

This part of implementation allows the user to input self-compiled assembler, compile and generate binary code. The functional modules include a user program file operation module, a user program error checking module, and a user program compiling and generating binary code module.

The user program file operation module provides the operations of opening, editing and saving program files. The opening operation is to read the program file edited by the user into the simulation interface. The simulation program we developed can only read txt text files, so the user must write the program code in a plain text file in advance. The editing operation is implemented in the input text box, which can complete the basic operations of program input, addition, and deletion. The user program save operation module is triggered by a button. When the user presses the save button, the content in the input text box can be saved as a text file, and the user can save and reuse the code.

The user program error checking module checks syntax errors and instruction errors in user program files according to the instruction system of the tester. Since the instruction system design of the model test machine is relatively simple, there are 34 instructions in total, and all of them are in the form of fixed operation codes. The instruction length is 1 byte and 2 bytes. bytes. Therefore, it is easier to identify and debug instructions. Use the string operation function to extract a line from the program file, remove the leading and trailing spaces, and compare the strings according to the instruction format. If there is an instruction format that is not in the instruction system, give An error message is displayed, and the edit page is returned.

If the instruction conforms to the instruction format specified by the instruction system, the user program is compiled to generate a binary code module, and the hexadecimal code of the instruction is obtained by looking up the table, and placed in the array representing the memory space. At the same time, the address of the memory space is changed according to the length of the instruction. serial number.

2.1.2 Program running simulation module

The operation of the program is essentially a process in which the various parts of the hardware are coordinated in succession. This part of the simulation involves the function realization of each module, the data transfer between each module, and the operation sequence of each module.

The function realization of each module is the same as the simulation part of a single module, but the source of data, address and control signal is no longer manually operated, but obtained by the bus. Data transfer between modules is carried out through the bus, including data bus, address bus and control bus. Therefore, when data is transferred between modules, there is an animation to demonstrate the flow direction of data. The data values of each module are saved with variables.

At the beginning of program operation, the initial variable value of each module is 0. After the user presses the run button, the basic sequence of computer program operation is simulated: fetching instructions, analyzing instructions, and executing instructions.

The program operation on the emulator provides two modes: micro-step operation and full-speed operation. Set a flag value according to the micro-step button or the full-speed operation button pressed by the user, and according to the flag value, set whether to execute the stop statement after each step of the micro-command animation.

Flash ActionScript programming ideas:

(1) Initialize all objects and variables on the machine interface

(2) Detect the running button, whether to press the micro single step button or the full speed button, and set the running mode flag variable

(3) Instruction fetching: The hardware objects involved in this process include program counter PC, memory, and instruction register; the variables involved in this process include PC value, current address value of memory, current data value of memory, and instruction register value. The signal transmission of this process is to assign the pc value to the current address value of the memory, check the memory data array according to the current address value of the memory, obtain the current data value of the memory, and transfer this value to the instruction register. In addition to the animation flow, this process also includes displaying the current address value of the memory, the current data value of the memory, and the value of the instruction register with display lights.

(4) Analyze instructions: the controller module emulates a microprogram controller, so the process of analyzing instructions is the process of finding the microprogram according to the value in the instruction register. The microprogram adopts the horizontal microinstruction format and is stored in the microprogram memory in advance. We design an array to save the values in the microprogram memory. The hardware involved in this process includes instruction registers and microprogram control memory; the variables involved in this process include instruction register values, microaddress values, and microinstruction values. The signal transmission of this process is to look up the micro-address of the micro-program corresponding to the instruction according to the value of the instruction register, and use the micro-address as the subscript of the micro-program memory array to find the first micro-instruction of the micro-program. The code in the microinstruction is the control signal of each module, so the control signal can be sent to the related modules according to the microinstruction code, and the module completes the corresponding function according to the control signal. In addition to demonstrating the flow of signals, the animation of this process also uses display lights to display micro-command values, micro-address values, and the value of each module's control signal lights.

The microcycle time of each instruction in the instruction system of the experimental instrument is different, and there are 2 to 4. We unify all instruction microcycles into 4. When the microcycles are less than 4 instructions are executed, the spare microcycles can execute the transfer instruction.

(4) Executing instructions: According to the micro-instructions obtained in the previous step, send control signals to each single-module clip, that is, each single-module clip obtains a combination of control signals. If the control signal is valid, the module realizes its own function, and the execution result is reflected in Among the variables of the hardware chip. 4 microinstructions have been carried out, then re-execute the (3) step. The system stops running until a shutdown command is encountered.

The beneficial effects of the invention are mainly manifested in: reducing costs and effectively assisting all requirements of teaching experiments.

Description of drawings

Figure 1 is the overall structure diagram of the simulation experiment system of "Computer Composition Principles".

Fig. 2 is a schematic diagram of single module objects and their relationships.

Figure 3 is a single-module simulation state transition diagram.

Figure 4 is a flow chart of single module simulation.

Figure 5 is a flow chart of the whole machine simulation.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

With reference to Fig. 1～Fig. 5, a kind of " computer composition principle " emulation experiment system, comprises single module experiment emulation subsystem and complete machine experiment emulation subsystem, described single module experiment emulation subsystem comprises register bank module emulation unit, general-purpose register Sending module simulation unit, arithmetic unit module simulation unit, memory and bus module simulation unit, instruction component simulation unit, microprogram controller module simulation unit and timing and start-stop module simulation unit, the single-module experimental simulation subsystem includes: initialization The module is used to set whether each object is visible, and to set the initial value of the variable. The object includes the hardware chip, the operation switch and the information channel between the modules. The variable includes the value of the hardware chip, the signal value of the operation switch, the signal value on the information path, The meaning of the control signal represented by the operation switch and the direction of information transmission; the switch button detection module is used for automatic detection of the button element in the flash, which will trigger an action, write code in this action, and judge whether it is a data switch or a control signal switch; data The switch operation module is used to display the information flow animation of data input to the experimental module, and assign the data switch value to the module hardware chip value; the switch action operation module is used to judge whether the control signal affects the experimental module according to the definition of the module signal. Valid, if valid, execute the function code of the module to complete the required function. If not, then the module does not run; the whole machine experiment simulation subsystem includes: an initialization module, which is used to initialize all objects and variables on the whole machine interface; an operation mode recognition module, which is used to detect the operation button, and judges whether to press the micro-single Step button or full speed button, set the running mode flag variable; instruction fetching module, used to assign the value to the current address value of the memory, check the memory data array according to the current address value of the memory, get the current data value of the memory, and transfer this value to the instruction register ; The current address value of the memory, the current data value of the memory, and the value of the instruction register are displayed with display lights; the analysis instruction module is used to look up the table according to the value of the instruction register to obtain the micro-address of the micro-program corresponding to the instruction, and use the micro-address as the micro-program memory The subscript of the array finds the first microinstruction of the microprogram. The code in the microinstruction is the control signal of each module. According to the microinstruction code, the control signal is sent to the modules involved, and the module completes the corresponding operation according to the control signal. Function; the display lamp displays the micro-instruction value, the micro-address value, and the control signal light value of each module; the execution command module is used to transmit control signals to each single-module clip according to the obtained micro-command, that is, each single-module clip obtains a combination of control signals, If the control signal is valid, the module realizes its own function, and the execution result is reflected in the variables of the hardware chip.

Described register set module emulation unit, general-purpose register module emulation unit, arithmetic unit module emulation unit, memory and bus module emulation unit, instruction component emulation unit, microprogram controller module emulation unit and timing and start-stop module emulation unit adopt flashActionscript_ is developed and published in HTML form, and the organization of the experimental system is connected in the form of HTML hyperlinks.

Embodiment 1: Simulation description of the arithmetic unit module

(1) Select Experiment 3 on the experiment list

(2) Enter the experimental guidance document of Experiment 3, and the end of the document is a link to the simulation operation

(3) Click the simulation operation to enter the calculator simulator interface

(4) Click on the data switch bus connector, and then click on the calculator module bus connector, a white data path appears between the data switch and the calculator module bus

(5) Click on the control switch EDR1, and then click on the control signal EDR1 of the arithmetic unit module, and a connecting signal line appears between the two points. Click on the control switch EDR2, and then click on the control signal EDR2 of the arithmetic unit module, and a connecting signal line appears between the two points.

After clicking the nominal control signal on the control switch in turn, click the corresponding operator module control signal, so that the connection signal line appears between the 10 control signals.

Then click the pulse button to point CCK1 and EDR1CK, CCK2 and EDR2CK, and two pulse signal connections appear.

There is no sequence requirement for the above connection operations, only the signals of two consecutive clicks are required to be connected, otherwise there will be no connection.

(6) Now you can make the arithmetic unit complete the calculation by giving different values to the data switch and the control switch. Suppose to complete 22H+33H

(7) Operate on the data switch, make the binary combination of the switch be 00100010, set the switch corresponding to EDR1 to 0 in the control switch, and set the other switches to 1. Click on EDR1CK. Animation of signal flow on the data switch to DR1 path. At this point, you can click the mouse on the DR1 hardware chip and see that the value in the chip is 00100010.

(8) Operate on the data switch, make the binary combination of the switch be 00110011, set the switch corresponding to EDR2 to 0 in the control switch, and set the other switches to 1. Click on EDR2CK. Animation of signal flow on the data switch to DR2 path. At this point, you can click the mouse on the DR2 hardware chip and see that the value in the chip is 00110011.

(9) Set the control switches s0-s3 to 1001, and set the control switch CN to 0. At this time, you can click the ALU hardware chip with the mouse, and observe that the value in the chip is 01010101.

(10) Set the ALU-O control switch to 0, and there will be a signal flow animation from the arithmetic unit module to the data bus light, and the data light will display the value of the ALU hardware chip as 01010101.

(11) At this time, the switch combination of S0~s3 can be adjusted, and the prompt information next to the ALU chip shows the current operation of the ALU chip. At the same time, you can view the results of different operations through the data light and click on the ALU chip.

Embodiment 2: description of the whole machine simulation

(1) Select Experiment 8 on the experiment list

(2) Enter the whole machine experiment guidance document, at the end of the document is the simulation operation link

(3) Click the whole machine simulation operation link to enter the program editing page

(4) Enter the program in the input text box. Suppose we enter the program as follows

MOV A, #55

MOV R0, #11

ADD A, R0

(5) Press the submit button to enter the program compilation interface, and translate each instruction into hexadecimal code form by clicking the instruction fetch and translation instruction buttons. code show as below

00 5F

01 55

02 6C

03 11

04 0C

(6) After the translation of the last command is completed, enter the emulator interface. You can click on the memory chip to view the code translated in the previous step. You can click on the microprogram controller chip to view the prestored microprograms in the machine.

(7) Click the micro-step or single-step operation button to execute the program. Assume that the program is run in microsteps.

(8) Click the micro single-step operation button, there is a signal flow from the PC chip to the memory chip, and the address of the memory is addr=0. The address bus indicator shows 00000000, there is a signal flow from the memory to the IR1 chip, the data bus indicator shows 01011111, and the command indicator shows 01011111. Micro address = 00H. At this time, there is a micro-signal indicator displaying 01001101111111111111111. The control signal lights PC-O, EIR1, RM, MLD flash. Complete instruction fetch microinstructions.

(9) Click the micro single-step operation button, there is a signal flow from the IR1 chip to the micro program memory chip, micro address = 17H. The micro address display light is 00010111. The microcode indicator light is 110111011111101111111111. Complete analysis instructions

(10) Click the micro single-step operation button, there is a signal flow from the memory chip to the general register A chip, the memory address addr=1, the address bus indicator is 00000001, and the data bus indicator is 01010101. Control signal lights PC-O, ERA, RM, MLD are valid. At this time, click on the general register A chip, and you can see that the value in A is 55H. Complete the function of the first instruction, and send 55H to the A register.

(11) Click the micro single-step operation button, there is a signal flow from the PC chip to the memory chip, and the address of the memory is addr=2. The address bus indicator shows 00000010, there is a signal flow from the memory to the IR1 chip, the data bus indicator shows 01101100, and the command indicator shows 01101100. Micro address = 18H. At this time, there is a micro-signal indicator displaying 01001101111111111111111. The control signal lights PC-O, EIR1, RM, MLD flash. Complete instruction fetch microinstructions.

(12) Click the micro single-step operation button, there is a signal flow from the IR1 chip to the micro-program memory chip, and the micro-address=1BH. The micro address display light is 00011011. The microcode indicator is 11011101101111111111111. Complete analysis instructions

(13) Click the micro-step operation button, there is a signal flow from the memory chip to the register R0 chip, the memory address addr=3, the address bus indicator is 00000011, and the data bus indicator is 00010001. Control signal lights PC-O, RM, MLD, WR are valid. At this time, click the register R0 chip, and you can see that the value in R0 is 11H. Complete the function of the second instruction, send 11H to the R0 register.

(14) Click the micro single-step operation button, there is a signal flow from the PC chip to the memory chip, and the address of the memory is addr=4. The address bus indicator shows 00000100, there is a signal flow from the memory to the IR1 chip, the data bus indicator shows 00001100, and the command indicator shows 00001100. Micro address = 03H. At this time, there is a micro-signal indicator showing 111111111111110011111001. The control signal lights PC-O, EIR1, RM, MLD flash. Complete instruction fetch microinstructions.

(15) Click the micro-step operation button, there is a signal flow from the A chip to the DR1 chip, and you can click DR1 to check that the DR1 value is 55H. There are control signal lamps ERA, RA-O, RR, EDR1 flashing. Complete the first microinstruction of the addition instruction ADD microprogram.

(16) Click the micro single-step operation button, micro address = 04H. At this time, there is a micro-signal indicator showing 111111110111111101111001. Complete the second microinstruction of the ADD microprogram.

(17) Click the micro-step operation button, there is a signal flow from the R0 chip to the DR2 chip, and you can click DR2 to check that the DR2 value is 11H. There are control signal lamps RR and EDR2 flashing. Complete the second microinstruction of the addition instruction ADD microprogram.

(18) Click the micro single-step operation button, micro address = 05H. At this time, there is a micro-signal indicator displaying 11111111111110111111001. Complete the third microinstruction of the ADD microprogram.

(19) Click the micro-step operation button, and there is a signal flow from ALU to A chip. Click ALU to check that the ALU value is 66H, and click A chip to check that the A value is 66H. Complete the second microinstruction of the ADD microprogram, that is, complete the third instruction.

(20) Click the micro-step operation button, there is a signal flow from the PC chip to the memory chip, and the address of the memory is addr=5. The address bus indicator shows 00000101, there is a signal flow from the memory to the IR1 chip, the data bus indicator shows 11111111, and the command indicator shows 11111111. Micro address = 3FH. At this time, there is a micro-signal indicator displaying 11111111110111111111111. The control signal lights PC-O, EIR1, RM, MLD flash. Complete instruction fetch microinstructions.

(21) Click the micro single-step operation button, the machine will stop without any action.

Claims (2)

1, a kind of " computer composition principle " simulation experiment system, it is characterized in that: described simulation experiment system comprises single module experiment simulation subsystem and complete machine experiment simulation subsystem, and described single module experiment simulation subsystem comprises register group module simulation unit, general-purpose register module simulation unit, computing unit module simulation unit, memory and bus module simulation unit, instruction component simulation unit, microprogram controller module simulation unit and timing and start-stop module simulation unit, the single-module experiment simulation unit The system includes: The initialization module is used to set whether each object is visible, and to set the initial value of the variable. The object includes the hardware chip, the operation switch and the information channel between the modules. The variable includes the value of the hardware chip, the signal value of the operation switch, and the signal value on the information path , The meaning of the control signal represented by the operation switch, and the direction of information transmission; the switch button detection module is used for automatic detection of the button element in the flash, which will trigger an action, write code in this action, and judge whether it is a data switch or a control signal switch; The data switch operation module is used to display the information flow animation of data input to the experimental module, and assign the data switch value to the module hardware chip value; The switch action operation module is used to judge whether the control signal is valid for the experimental module according to the definition of the module signal, and if it is valid, execute the function code of the module to complete the required function. If not, the module does not run; The complete machine experiment simulation subsystem includes: The initialization module is used to initialize all objects and variables on the whole machine interface; The running mode identification module is used to detect the running button, judge whether to press the micro single step button or the full speed button, and set the running mode flag variable; The instruction fetch module is used to assign the value to the current address value of the memory, check the memory data array according to the current address value of the memory, obtain the current data value of the memory, and transfer this value to the instruction register; the current address value of the memory, the current data value of the memory, the instruction The register value is displayed by the indicator light; The analysis command module is used to obtain the micro-address of the micro-program corresponding to the command according to the value of the command register, and use the micro-address as the subscript of the micro-program memory array to find the first micro-command of the micro-program. The code of each module is the control signal of each module. According to the micro-command code, the control signal is sent to the modules involved, and the module completes the corresponding function according to the control signal; the display lamp displays the micro-command value, micro-address value, and the value of the control signal light of each module; The execution command module is used to transmit control signals to each single module editing according to the obtained micro instructions, that is, each single module editing obtains a combination of control signals. If the control signal is valid, the module realizes its own function, and the execution result is reflected in the hardware chip. in the variable. 2, a kind of "computer composition principle" simulation experiment system as claimed in claim 1, is characterized in that: described register set module simulation unit, general register send module simulation unit, computing unit module simulation unit, memory and bus module The simulation unit, instruction component simulation unit, microprogram controller module simulation unit and timing and start-stop module simulation unit are developed with flashActionscript_ and published in HTML format. The organization of the experimental system is connected in the form of HTML hyperlinks.

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