Usage of KUE-CHIP2 Simulator JAVA

Overview

All operations from entry of a program to its execution are identical with the real KUE-CHIP2 educational CPU board. However, following four points differ from it.

Entry method of a program and data using Memory Editor.
Editing method of a value of a register and a flag.
Visualization for internal operation by block diagram.
Displaying execution history of a user program on a Log Window.

This KUE-CHIP2 simulator consists mainly of two subsystems.

Display subsystem: This subsystem displays internal conditions such as registers and flags in KUE-CHIP2 on some LEDs and seven-segment displays.
Control subsystem: This subsystem controls the operation of the KUE-CHIP2 simulator.

You can see the conditions of simulator on the display subsystem at upper half of display area, and operate it through the control subsystem at lower half of that. You can also invoke some utilities, such as Memory Editor, from the control subsystem.

About Menu

Applet Edition displays a menu as a separated window at startup. This is because applet cannot have a menu bar. If the menu window appears at wrong size, please resize it manually into appropriate size.

Stand-alone Eition has a menu at the top of a window.

Display subsystem

Display subsystem has following LEDs and seven-segment displays.

Display Device	Function
OP (LED)	Light up when a program is running
P0~P4 (LED)	Execution clock phase
CF,VF,NF,ZF (LED)	Indicate conditions of Flags. If the flag is set, the corresponding LED will light up.
INF, IN (LED)	The input value by IN instruction in binary format
OUTF, OUT (LED)	The output value by OUT instruction in binary format
PC (7-segment)	Program Counter (PC) in hex format
IR (7-segment)	Instruction Register (IR) in hex format
ACC (7-segment)	ACC register in hex format
IX (7-segment)	IX register in hex format
MAR (7-segment)	Memory Address Register (MAR) in hex format
Address (7-segment)	Accessing address in hex format

Control subsystem

Control subsystem has following buttons.

Control Button	SS	Run a program until HALT instruction. If you push this button while a program is running, the simulator will stop before fetching the next instruction.
	SI	Step only one instruction of the program.
	SP	Step only one clock phase of the program.
	RESET	Reset KUE-CHIP2 simulator into initial state. All registers and flags will be set to zero.
	CLOCK	Clock speed can be set in five steps by pull-down menu.
Tool Button	MEMORY	Toggles display of memory editor window.
	BLOCK	Toggles display of block diagram window.
	LOG	Toggles display of log window.
Instruction	Displays the current instruction in mnemonic form.
Total Phase	Displays total number of phases from beginning of the program.
Total Instruction	Displays total number of instructions from beginning of the program.
State	Displays current status of the simulator. It is represented as following four status. RESET (Just at the reset) BREAK (Stop at a break point) RUNNING (Program is running) STOP (Program is not running)

Entry of Program

Both Applet Edition and Stand-alone Edition

Use Memory Editor to enter a program. When you press MEMORY button on Control subsystem, Memory Editor will appear as a window which is separated from your browser. You can input your program into arbitrary address in byte by byte using this window.

Program code must be in hex format. First, click a value by mouse to reverse it. You have to reverse only one byte. After that, you may type new value in hex format with keyboard.

In this way, you will enter the program in byte by byte.

Only for Stand-alone Edition

You may import a program from a text file. Specify the program file in a dialog box after selecting [File]-[Open..] menu.

Format of Program File

A text file which contains a program must be written in following format.

Strings which begin with "#" are recognized as comment.
Read into memory per byte (two hexadecimal digit).
Ignore all characters except 0~9???A~F, a~f???(), [], and #. Therefore, any other characters can be inserted at byte boundary.
Ex. (10) 11, 22, 33-44:55@44
This sample program will be placed in following order.

Address 010H 011H 012H 013H 014H 015H

Data 11H 22H 33H 44H 55H 44H
One byte which is surrounding "(" and ")" represents address for program area. The values which followed the specified address are placed sequentially into the memory.
Ex. (00)6c 60
First, set 00 as address for program area. Second, set 6CH into address 00, and set 60H into address 01.
One byte which is surrounding "[" and "]" represents address for data area.

Address	010H	011H	012H	013H	014H	015H
Data	11H	22H	33H	44H	55H	44H

Entry of Data

You can entry data into memory as entry of program.

In Stand-alone Edition, you can import data from a text file. You must specify a target address by "[]" in the file.

Execution of Program

Executing program is follow the same sequence as KUE-CHIP2 educational CPU board. First, push RESET button to reset all internal conditions of the simulator. Next, use SS, SI and SP buttons to step the program.

Filling, Editing and Saving Memory

The dialog box on the right will appear when you select [Operation...] from [Memory] menu.

You can modify memory by following three operations from this dialog box. Select one of three radio buttons.

Fill Memory: You can fill memory range (from Start address: to End address:) with a value Data:.
Move Memory: You can move memory range (from Start address: to End address:) to destination address Move to:. After this operation, the source memory range will be filled with zero.
Copy Memory: You can copy memory range (from Start address: to End address:) to destination address Copy to:.

In Stand-alone Edition, you can save all memory into a file by selecting [Save Memory...] from [File] menu. This file is read into memory by selecting [Open...] from [File] menu.

Editing Registers and Flags

Editing Registers: Click a seven-segment display on which you want to change value of register. Type new value in hex format after the clicked display changes into reverse.
Editing Flags: Click a LED on which you want to change status of flag. The status will toggle by clicking.

Setting a Breakpoint

You can set a breakpoint separately for each register (PC, IR, MAR, ACC, and IX). A program will stop at the breakpoint when its condition is satisfied.

For example, if you set break condition to 03H for PC, the program will stop when PC reaches 03H. At the time, BREAK will be displayed in the State: column.

Break condition is set on a small seven-segment display beside a seven-segment of each register. The small seven-segment will be highlighted after you click it by the mouse. Then you can enter a value in hex format from the keyboard.

If you want enable this break condition, select [Break point on] from [Control] menu. Then the menu item will be changed into [Break point off]. Also, you can disable a breakpoint by selecting [Break point off] even if you have already set a value as a breakpoint.

Click a value and type "-" (hyphen) from the keyboard to disable (reset) the value.

Logging of Execution History

First, click a LOG button on the control subsystem to open a Log Window. To begin logging, select [Start Log] from [Log] menu on the window. All execution histories will be displayed in the window. The menu item changes into [Stop Log] while the logging. You can stop the logging by clicking [Stop Log].

You can clear all contents of the log window by selecting [Clear Log] from [Log] menu.

In Stand-alone Edition, you can save the contents of the log window by selecting [Save Log...] from [File] menu.

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