EduMIPS64 User Manual
Contents
1. 3 Flow control instructions Flow control instructions are used to alter the order of instructions that are fetched by the CPU We can make a distinction between these instructions R Type I Type and J Type Those instructions effectively executes the jump in the ID stage so often an useless fetch is executed In this case two instructions are removed from the pipeline and the branch taken stalls counter is incremented by two units List of R Type flow control instructions e JALR rs Puts the content of rs into the program counter and puts into R31 the address of the instruction that follows the JALR instruction the return value e JR rs Puts the content of rs into the program counter List of I Type flow control instructions e BEQ rs rt offset Jumps to offset if rs is equal to rt e BEQZ rs offset Jumps to offset if rs is equal to zero 19 WARNING This is a deprecated instruction that does not belong to the MIPS64 instruction set but it is included in the instruction set in order to maintain compatibility with other simulators e BNE rs rt offset Jumps to offset if rs is not equal to rt e BNEZ rs Jumps to offset if rs is not equal to zero WARNING This is a deprecated instruction that does not belong to the MIPS64 instruction set but it is included in the instruction set in order to maintain compatibility with other simulators List of J Type flow control instructions e J target Put2. be specified one or more rows above the effective data declaration or instruction provided that there s nothing except for comments and empty lines between the label and the declaration 1 1 1 The data section The data section contains commands that specify how the memory must be filled before program execution starts The general form of a data command is label datatype value1 value2 EduMIPS64 supports different data types that are described in table 1 1 Type Directive Bits required Byte byte 8 Half word word16 16 Word word32 32 Double Word word or word64 64 Table 1 1 Basic data types Please note that a double word can be introduced either by the word directive or by the word64 directive There s a big difference between declaring a list of data elements using a single directive or by using multiple directives of the same type EduMIPS64 starts writing from the next 64 bit double word as soon as it finds a datatype identifier so the first byte statement in listing 1 2 will put the numbers 1 2 3 and 4 in the space of 4 bytes taking 32 bits while code in the next four rows will put each number in a different memory cell occupying 32 bytes as in table 1 2 data byte 1 2 3 4 byte 1 byte 2 byte 3 byte 4 Listing 1 2 Adjacent bytes In table 1 2 the memory is represented using byte sized cells and each row is 64 bits wide The address on the left side of eac
3. i placeholder SYSCALL 5 expects a parameter starting from the address of the previous one 23 When the SYSCALL finds a placeholder for an integer parameter it expects that the corresponding parameter is an integer value when if it finds a placeholder for a string parameter it expects as a parameter the address of the string The result is printed in the input output frame and the number of bytes written is put into R1 If there s an error 1 is written to R1 2 5 Other instructions In this section there are instructions that do not fit in the previous categories 2 5 1 BREAK The BREAK instruction throws an exception that has the effect to stop the execution if the simulator is running It can be used for debugging purposes 2 5 2 NOP The NOP instruction does not do anything and it s used to create gaps in the source code 2 5 3 TRAP The TRAP instruction is a deprecated alias for the SYSCALL instruction 2 5 4 HALT The HALT instruction is a deprecated alias for the SYSCALL 0 instruction that halts the simulator 24 Chapter 3 The user interface The GUI of EduMIPS64 is inspired to WinMIPS64 user interface In fact the main window is identical except for some menus Please refer to The EduMIPS64 main window is composed by a menu bar and six frames showing different aspects of the simulation There s also a status bar that has the double purpose to show the content of memory cells and registers when
4. the special register HI into rd MOVN rd rs rt If rt is different from zero then moves the content of rs into rd MOVZ rd rs rt If rt is equal to zero then moves the content of rs into rd OR rd rs rt Executes a bitwise OR between rs and rt and puts the result into rd SLT rd rs rt Sets the value of rd to 1 if the value of rs is less than the value of rt otherwise sets it to 0 This instruction performs a signed comparison SLTU rd rs rt Sets the value of rd to 1 if the value of rs is less than the value of rt otherwise sets it to 0 This instruction performs an unsigned comparison XOR rd rs rt Executes a bitwise exclusive OR XOR between rs and rt and puts the result into rd Here s the list of Type ALU Instructions e ANDI rt rs immediate Executes the bitwise AND between rs and the immediate value putting the result in rt 15 DADDI rt rs immediate Executes the sum between rs and the immediate value putting the result in rt This instruction considers rs and the immediate value as signed values DADDUI rt rs immediate Executes the sum between rs and the immediate value putting the result in rt This instruction considers rs and the immediate value as unsigned values LUI rt immediate Loads the constant defined in the immediate value in the upper half 16 bit of the lower 32 bits of rt sign extending the upper 32 bits of the register ORI rt rs immediate Execut
5. you click them and to notify the user that the simulator is running when the simulation has been started but verbose mode is not selected There are more details in the following section 3 1 The menu bar The menu bar contains six menus 3 1 1 File The File menu contains menu items about opening files resetting or shutting down the simulator writing trace files e Open Opens a dialog that allows the user to choose a source file to open 25 e Open recent Shows the list of the recent files opened by the simulator from which the user can choose the file to open e Reset Resets the simulator keeping open the file that was loaded but re setting the execution e Write Dinero Tracefile Writes the memory access data to a file in xdin format e Exit Closes the simulator The Write Dinero Tracefile menu item is only available when a whole source file has been executed and the end has been already reached 3 1 2 Execute The Execute menu contains menu items regarding the execution flow of the simulation e Single Cycle Executes a single simulation step e Run Starts the execution stopping when the simulator reaches a SYSCALL O or equivalent or a BREAK instruction or when the user clicks the Stop menu item or presses F9 e Multi Cycle Executes some simulation steps The number of steps ex ecuted can be configured through the Setting dialog See 3 3 1 for more details e Stop Stops the executio
6. 8 3 23 a A SS nk GE ane AE eee ee 29 324 Pipeline a Sra Bandi Gk bad GE eR eS 29 X220 Memory ys Dr BAS hn BA A le Se alae d 29 320 AE Ee RR ae i Ie thes 29 3 2 7 Input Output oe eae AENA 29 Palot S s ant II ee ee ar a Se Ed Shes 30 3 31 Settings ss x ve Mots ate hee Me ee Ee Ie Seles 30 3 3 2 Dinero Frontend 4 46 6 AE a RY AS 31 ob Oy A Helpa ds Eo e ek A RG A ARES 31 Command line options 4 25014 104 a 31 Running EduMIPS64 026 kK wae es a 32 List of Tables 1 1 Basicidata IVpES e eases a ad a 1 2 Memory status for Listing 1 2 2 2 0 6 ers 1 3 Escaping sequences e nro do ai a Listings 1 1 Sample EduMIPS64 code aca ie ie Poa ee Pe i gt vA acent bytes 2 onsets ds aia a a Introduction EduMIPS64 is a MIPS64 Instruction Set Architecture ISA simulator It is designed to be used to execute small programs that use the subset of the MIPS64 ISA implemented by the simulator allowing the user to see how instructions behave in the pipeline how stalls are handled by the CPU the status of registers and memory and much more It is both a simulator and a visual debugger This manual will introduce you to EduMIP564 and will cover some details on how to use it The first chapter covers the format of source files accepted by the simulator describing the data types and the directives in addition to command line pa rameters In the second chapter there s an overview of the subset of the MIPS64 instruction set that is accepted by E
7. EduMIPS64 User Manual by Andrea Spadaccini Version 1 15 March 2007 Contents 1 Source files format 1 1 2 The 2 1 2 2 2 3 2 4 2 5 SEGONS sel eTe Weal a eade Mets a ade Ta a rs 1 1 1 The data section oo aa a a 000004 1 1 2 The code section o oo aa a a a aL 1 1 3 The include command aa aa a a a a a a instruction set ALU Instructions Load Store instructions oS La AA di Flow control Instructions 2 4 1 SYSCALL O l O ES H ct ny w 2 4 2 SYSCALL 1 l o o 9 B we 24 3 1 OVAL 2 CLOS ade gee tes Sey hehe ig WR EY 2 4 4 SYSCALL 3 1 H o 10 a APS NA 245 SYSCALL 4 writeQ 24 6 SYSCALT Ses PEINTE O o AAN Other instructions 0 0 0 E a a AAE ee eee Dl BREAKS mousi f Soe had as a ge ie Se as a ls Te a Se Gh a A Be S 10 11 3 The 3 1 3 2 3 3 3 4 3 9 Zao A INDE gM AS Bea ee Ec lcd ls ia amp ets 24 Ao TRAP in oe oe ee a a eect ee Uli Me ee Me amp StS 24 pA hc Same A a nee A A A Se D a oA 24 user interface 25 The STi Da LI ae ds gs J es ee ae e 25 ell Blest BS at RA A ee SN 25 clea A E ck ae od ee ee Gt ee BE eee Be 26 313 a Ag one g ait od A ee ee BN 2 Sella AOS id E r A A A pag ules WINDOW td ear La XO eae a ME ee ek BODEN sk BOSS 2T AI E E Ak T E se D o E i R 28 PESE g utteni lr a ir s E i eR 28 SAL PENES eni lr a La in a E is 28 322 Registers lt 2 tua a Cte WPS awit PE Bk ee Sos OO eS 2
8. arameters e Registers a register parameter is indicated by an uppercase or lowercase r or a followed by the number of the register between 0 and 31 as in r4 E R4 or 4 f e Immediate values an immediate value can be a number or a label the number can be specified in base 10 or in base 16 base 10 numbers are simply inserted by writing the number while base 16 number are inserted by putting before the number the prefix Ox e Address an address is composed by an immediate value followed by a reg ister name enclosed in brackets The value of the register will be used as the offset 10 The size of immediate values is limited by the number of bits that are available in the bit encoding of the instruction The instructions that can be used in this section will be discussed in section 2 1 1 3 The tinclude command Source files can contain the include filename command which has the effect of putting in place of the command row the content of the file filename It is useful if you want to include external routines and it comes with a loop detection algorithm that will warn you if you try to do something like include A s in file B s and include B s in file A s 11 Chapter 2 The instruction set In this section we will the subset of the MIPS64 instruction set that Edu MIPS64 recognizes We can operate two different taxonomic classification one based on the functionality of t
9. arameters of DinerolV The lower section contains the output of the DinerolV process from which you can take the data that you need 3 3 3 Help The Help dialog contains three tabs with some indications on how to use the simulator The first one is a brief introduction to EduMIPS64 the second one contains informations about the GUI and the third contains a summary of the supported instructions 3 4 Command line options Three command line options are available They are described in the following list with the long name enclosed in round brackets Long and short names can be used in the same way 31 e h help shows a help message containing the simulator version and a brief summary of command line options e f file filename opens filename in the simulator e d debug enters Debug mode The debug flag has the effect to activate Debug mode In this mode a new frame is available the Debug frame and it shows the log of internal activities of EduMIPS64 It is not useful for the end user it is meant to be used by EduMIPS64 developers 3 5 Running EduMIPS64 The EduMIPS64 jar file can act both as a stand alone executable jar file and as an applet so it can be executed in both ways Both methods need the Java Runtime Environment version 5 or later To run it as a stand alone application the java executable must be issued in this way java jar edumips64 version jar where the version string must be replace
10. cles option will influence how many milliseconds the simulator will wait before starting a new cycle Those options are effective only when the simulation is run using the Run or the Multi Cycle options from the Execute menu The last two options set the behavior of the simulator when a synchronous exception is raised If the Mask synchronous exceptions option is checked the simulator will ignore any Division by zero or Integer overflow exception If the Terminate on synchronous exception option is checked the simulation will be halted if a synchronous exception is raised Please note that if synchronous 30 exceptions are masked nothing will happen even if the termination option is checked If exceptions are not masked and the termination option is not checked a dialog will pop out but the simulation will go on as soon as the dialog is closed If exceptions are not masked and the termination option is checked the dialog will pop out and the simulation will be stopped as soon as the dialog is closed The last tab allows to change the colors that are associated to the different pipeline stages through the frames It s pretty useless but it s cute 3 3 2 Dinero Frontend The Dinero Frontend dialog allows to feed a DinerolV process with the trace file internally generated by the execution of the program In the first text box there is the path of the DinerolV executable and in the second one there must be the p
11. d with the actual version of the simulator On some systems you may be able to execute it by just clicking on the jar file To embed it in an HTML the lt applet gt tag must be used The EduMIPS64 web site contains a page that already contains the applet so that everyone can execute it without the hassle of using the command line 32
12. duMIPS64 with all the needed parameters and indications to use them The third chapter is a description of the user inter face of EduMIPS64 that explains the purpose of each frame and menu along with a description of the configuration dialog the Dinero frontend dialog the Manual dialog and command line options This manual refers to EduMIPS64 version 0 4 Chapter 1 Source files format EduMIPS64 tries to follow the conventions used in other MIPS64 and DLX simulators so that old time users will not be confused by its syntax 1 1 Sections There are two sections in a source file the data section and the code section introduced respectively by the data and the code directives In listing 1 1 you can see a very basic EduMIPS64 program To distinguish the various parts of each source code line any combination of spaces and tabs can be used as the parser ignores multiple spaces and only detects whitespaces to separate tokens This is a comment data label word 15 This is an inline comment code daddi ri r0 0 syscall 0 Listing 1 1 Sample EduMIPS64 code Comments can be specified using the character everything that follows that character will be ignored So a comment can be used inline after the directive or on a row by itself Labels can be used in the code to reference a memory cell or an instruction They are case insensitive Only a label for each source code line can be used The label can
13. e multiplication between rs and rt putting the result in LO e DSLL rd rt sa Does a left shift to of rt by the amount specified in the immediate value sa and puts the result into rd Empty bits are padded with zeros e DSLLV rd rs rt Does a left shift to of rs by the amount specified in rt and puts the result into rd Empty bits are padded with zeros 13 DSRA rd rs sa Does a right shift to of rs by the amount specified in the immediate value sa and puts the result into rd Empty bits are padded with zeros if the leftmost bit of rs is zero otherwise they are padded with ones DSRAV rd rs rt Does a right shift to of rs by the amount specified in rt and puts the result into rd Empty bits are padded with zeros if the leftmost bit of rs is zero otherwise they are padded with ones DSRL rd rs sa Does a right shift to of rs by the amount specified in the immediate value sa and puts the result into rd Empty bits are padded with zeros DSRLV rd rs rt Does a right shift to of rs by the amount specified in rt and puts the result into rd Empty bits are padded with zeros DSUB rd rs rt Subtracts the value of rt to rs considering them as signed values and puts the result in rd DSUBU rd rs rt Subtracts the value of rt to rs considering them as unsigned values and puts the result in rd MFLO rd Moves the content of the special register LO into rd 14 MFHI rd Moves the content of
14. es the bitwise OR between rs and the immediate value putting the result in rt SLTI rt rs immediate Sets the value of rt to 1 if the value of rs is less than the value of the imme diate otherwise sets it to 0 This instruction performs a signed comparison SLTUI rt rs immediate Sets the value of rt to 1 if the value of rs is less than the value of the immediate otherwise sets it to 0 This instruction performs an unsigned comparison XORI rt rs immediate Executes a bitwise exclusive OR XOR between rs and the immediate value and puts the result into rt 16 2 2 Load Store instructions This category contains all the instructions that operate transfers between reg isters and the memory All of these instructions are in the form label INSTRUCTION rt offset base Where rt is the source or destination register depending if we are using a store or a load instruction offset is a label or an immediate value and base is a register The address is obtained by adding to the value of the register base the immediate value offset The address specified must be aligned according to the data type that is treated Load instructions ending with U treat the content of the register rt as an unsigned value List of load instructions e LB rt offset base Loads the content of the memory cell at address specified by offset and base in register rt treating it as a signed byte e LBU rt offset base Loads the c
15. for an input via an input dialog If the length of the input is greater than the number of bytes that have to be read the simulator will show again the message dialog It returns the number of bytes that have effectively been read or 1 if the read operation fails Possible causes of failure are the attempt to read from a 22 non existent file descriptor the attempt to read from file descriptors 1 standard output or 2 standard error or the attempt to read from a write only file de scriptor 2 4 5 SYSCALL 4 write SYSCALL 4 expects three parameters the file descriptor to write to the address where the data must be read from the number of bytes to write If the first parameter is two or three the simulator will pop the input output frame and write there the read data It returns the number of bytes that have been written or 1 if the write operation fails Possible causes of failure are the attempt to write to a non existent file descriptor the attempt to write to file descriptor 0 standard input or the attempt to write to a read only file descriptor 2 4 6 SYSCALL 5 printf SYSCALL 5 expects a variable number of parameters the first being the address of the so called format string In the format string can be included some placeholders described in the following list e s indicates a string parameter e i indicates an integer parameter e d behaves like i Ah literal For each s d or
16. h row of the table refers to the right most memory cell that has the lowest address of the eight cells in each line 0 Ea ES Table 1 2 Memory status for Listing 1 2 There are some special directives that need to be discussed space ascii and asciiz The space directive is used to leave some free space in memory It accepts as a parameter an integer that indicates the number of bytes that must be left empty It is handy when you must save some space in memory for the results of your computations The ascii directive accepts strings containing any of the ASCII characters and some special C like escaping sequences that are described in table 1 3 and puts those strings in memory The asciiz directive behaves exactly like the ascii command with the difference that it automatically ends the string with a null byte Escaping sequence Meaning ASCII encoding NO NE n ym Null byte 0 Horizontal tabulation 9 Newline character 10 Literal quote character 34 Literal backslash character 92 Table 1 3 Escaping sequences 1 1 2 The code section fille The code section contains commands that specify how the memory must be d when the program will start The general form of a code command is label instruction parami param2 param3 The code section can be specified with the text alias The number and the type of parameters depends on the instruction itself Instructions can take three types of p
17. he instructions and one based on the type of the parameters of the instructions The first classification divides instruction into three categories ALU instruc tions Load Store instructions Flow control instructions The next three sub sections will describe each category and every instruction that belongs to those categories The fourth subsection will describe instructions that do not fit in any of the three categories 2 1 ALU Instructions The Arithmetic Logic Unit in short ALU is a part of the execution unit of a CPU that has the duty of doing arithmetical and logic operations So in the ALU instructions group we will find those instructions that do this kind of operations ALU Instructions can be divided in two groups R Type and I Type Four of those instructions make use of two special registers LO and HI They 12 are internal CPU registers whose value can be accessed through the MFLO and MFHI instructions Here s the list of R Type ALU Instructions e AND rd rs rt Executes a bitwise AND between rs and rt and puts the result into rd e DADD rd rs rt Sums the content of rs and rt considering them as signed values and puts the result into rd e DADDU rd rs rt Sums the content of rs and rt considering them as unsigned values and puts the result into rd e DDIV rs rt Executes the division between rs and rt putting the quotient in LO and the remainder in HI e DMULT rs rt Executes th
18. lp This menu contains help related menu items e Manual Shows the Help dialog See 3 3 3 e About us Shows a cute dialog that contains the names of the project contributors along with their roles 3 2 Frames The GUI is composed by seven frames six of which are visible by default and one the I O frame is hidden 3 2 1 Cycles The Cycles frame shows the evolution of the execution flow during time show ing for each time slot which instructions are in the pipeline and in which stage of the pipeline they re located 3 2 2 Registers The Registers frame shows the content of each register By left clicking on them you can see in the status bar their decimal signed value while double clicking on them will pop up a dialog that allows the user to change the value of the register 28 3 2 3 Statistics The Statistics frame shows some statistics about the program execution 3 2 4 Pipeline The Pipeline frame shows the actual status of the pipeline showing which instruction is in which pipeline stage Different colors highlight different pipeline stages 3 2 5 Memory The Memory frame shows memory cells content along with labels and com ments taken from the source code Memory cells content like registers can be modified double clicking on them and clicking on them will show their decimal value in the status bar The first column shows the hexadecimal address of the memory cell and the second column sho
19. n when the simulator is in Run or Multi cycle mode as described previously 26 This menu is only available when a source file is loaded and the end of the simu lation is not reached The Stop menu item is available only in Run or Multi Cycle mode 3 1 3 Configure The Configure menu provides facilities for customizing EduMIPS64 appear ance and behavior e Settings Opens the Settings dialog described in 3 3 1 e Change Language Allows the user to change the language used by the user interface Currently only English and Italian are supported This change affects every aspect of the GUI from the title of the frames to the online manual and warning error messages The Settings menu item is not available when the simulator is in Run or Multi Cycle mode because of potential race conditions 3 1 4 Tools This menu contains only an item used to invoke the Dinero Frontend dialog e Dinero Frontend Opens the Dinero Frontend dialog See 3 3 2 This menu is not available until you have not executed a program and the execu tion has reached its end 3 1 5 Window This menu contains items related to operations with frames 21 e Tile Sorts the visible windows so that no more that three frames are put in a row It tries to maximize the space occupied by every frame The other menu items simply toggle the status of each frame making them visible or minimizing them 3 1 6 He
20. oes not exist e O_APPEND 0x08 In write mode appends written text at the end of the file e O_TRUNC 0x08 In write mode deletes the content of the file as soon as it is opened 21 It is mandatory to specify one of the first three modes The fourth and the fifth modes are exclusive you can not specify O_APPEND if you specify O TRUNC and vice versa You can specify a combination of modes by simply adding the integer values of those flags For instance if you want to open a file in write only mode and append the written text to the end of file you should specify the mode 2 8 10 The return value of the system call is the new file descriptor associated with the file that can be further used with the other system calls If there is an error the return value will be 1 2 4 3 SYSCALL 2 close SYSCALL 2 expects only one parameter the file descriptor of the file that is closed If the operation ends successfully SYSCALL 2 will return 0 otherwise it will return 1 Possible causes of failure are the attempt to close a non existent file descriptor or the attempt to close file descriptors 0 1 or 2 that are associated respectively to standard input standard output and standard error 2 4 4 SYSCALL 3 read SYSCALL 3 expects three parameters the file descriptor to read from the address where the read data must be put into the number of bytes to read If the first parameter is 1 the simulator will prompt the user
21. ontent of the memory cell at address specified by offset and base in register rt treating it as an unsigned byte e LD rt offset base Loads the content of the memory cell at address specified by offset and base in register rt treating it as a double word 17 e LH rt offset base Loads the content of the memory cell at address specified by offset and base in register rt treating it as a signed half word e LHU rt offset base Loads the content of the memory cell at address specified by offset and base in register rt treating it as an unsigned half word e LW rt offset base Loads the content of the memory cell at address specified by offset and base in register rt treating it as a signed word e LWU rt offset base Loads the content of the memory cell at address specified by offset and base in register rt treating it as a signed word List of store instructions e SB rt offset base Stores the content of register rt in the memory cell specified by offset and base treating it as a byte e SD rt offset base Stores the content of register rt in the memory cell specified by offset and base treating it as a double word e SH rt offset base Stores the content of register rt in the memory cell specified by offset and base treating it as a half word 18 e SW rt offset base Stores the content of register rt in the memory cell specified by offset and base treating it as a word 2
22. s the immediate value target into the program counter e JAL target Puts the immediate value target into the program counter and puts into R31 the address of the instruction that follows the JAL instruction the return value 2 4 The SYSCALL instruction The SYSCALL instruction offers to the programmer an operating system like interface making available six different system calls System calls expect that the address of their parameters is stored in register R14 and will put their return value in register R1 System calls follow as much as possible the POSIX convention 20 2 4 1 SYSCALL O exit SYSCALL 0 does not expect any parameter nor it returns anything It simply stops the simulator Note that if the simulator does not find SYSCALL 0 in the source code or any of its equivalents HALT TRAP 0 it will be added automatically at the end of the source 2 4 2 SYSCALL 1 open The SYSCALL 1 expects two parameters a zero terminated string that indi cates the pathname of the file that must be opened and a double word containing an integer that indicates the flags that must be used to specify how to open the file This integer must be built summing the flags that you want to use choosing them from the following list e O_RDONLY 0x01 Opens the file in read only mode e O_WRONLY 0x02 Opens the file in write only mode e O_RDWR 0x03 Opens the file in read write mode e O_CREAT 0x04 Creates the file if it d
23. ws the value of the cell Other columns show additional info from the source code 3 2 6 Code The Code window shows the instructions loaded in memory The first column shows the address of the instruction while the second column shows the hexadec imal representation of the instructions Other columns show additional info taken from the source code 3 2 7 Input Output The Input Output window provides an interface for the user to see the output that the program creates through the SYSCALLs 4 and 5 Actually it is not used 29 for input as there s a dialog that pops up when a SYSCALL 3 tries to read from standard input but future versions will include an input text box 3 3 Dialogs Dialogs are used by EduMIPS64 to interact with the user in many ways Here s a summary of the most important dialogs 3 3 1 Settings In the Settings dialog various aspects of the simulator can be configured The Main Settings tab allow to configure forwarding and the number of steps in the Multi Cycle mode The Behavior tab allow to enable or disable warnings during the parsing phase the Sync graphics with CPU in multi step execution option when checked will synchronize the frames graphical status with the internal status of the simulator This means that the simulation will be slower but you ll have an explicit graphical feedback of what is happening during the simulation If this option is checked the Interval between cy
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