CONFIG (Initial Configuration) Command

From a host computer:

D. COMMAND LINE OVERRIDES

3. CONFIG (Initial Configuration) Command

This command will return the emulator menus, ports, memory map, predefined sequences and other battery backed-up configuration values to the factory configuration.

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4. DL (Disable Latch) Command

This command is used to restore the emulators address latches to a mode in which all addresses which are generated by the processor are placed on the target system address bus. In this mode, the emulator will be read-ing from various address in the target system. H this is unacceptable, use the Enable Latch (EL) command.

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HMI·200·68000

5. D (Dump) Command

The Dump Command will display the contents of memory in the specified address range showing the hexadecimal data with its ASCII equivalent on the screen.

If no ending address is given, then one screen of data will be displayed and the command will teiminate. If no starting address is specified then the last ending address (whether user entered or default) will be used as the starting address. Using this method of defaulting allows the user to dump a display of memory from some starting address and get the next and subsequent pages of data dumped by simply typing the "0" and a car-riage return.

The Format for the Dump Command is:

o

([SUPDWBT]) (Baddr) (Eaddr)

where:

Baddr - is the hexadecimal beginning address of the block of memory to be displayed

Eaddr - is the hexadecimal ending address of the block of memory to be

The hexadecimal portion of the display can be selected as either byte values separated by spaces or word values separated by spaces. Based on the mode selected by the global parameters or overrides.

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6. EL (Enable Latch) Command

The emulator is designed to be as flexible as possible in its interface to a wide variety of target system designs. Generally, when the emulator is plugged into the target system, the address lines are changing, reflecting the emulators on-board monitor which the processor is executing. For the most part, this does not interfere with the operation of the target sys-tem.

There are a few cases, however, where a target system will not function properly when random addresses (reads) are placed on its bus. An ex-ample of this type of situation would occur when the user has configured the emulator to use Target System DTACK and the target systems memory has parity check. When the emulator and target system are powered up, the emulator processor begins to run internal code while the target system interprets the emulators operation as memory reads.

When memory reads are performed on uninitialized memory with parity, then parity errors are bound to occur. The parity error may cause the target system to fail to return a DTACK signal, thus causing the emulator to time-out.

The Enable Latch (EL) command is available to remedy this situation.

The EL command will force the emulator to latch out the last valid ad-dress used by the target system. For example, after a Reset command is issued, the address 00006 will remain on the target system address bus.

Another example would be if memory were Dumped from 100 to 150, then the address 00150 would be latch on the target system address bus.

If the EL command has been activated and the emulator tries to read memory where no DTACK signal will be returned, then the emulator will time out. Instead of latching out the address which caused the DTACK time-out, the emulator will force a dummy read to a known good address, initially 00000 (see TA command), thus latching out a valid address which will always return a DTACK on each memory read which the emulator performs.

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7. E/EN (Enter) Command

The Enter Command is used to examine memory at the specified loca-tion with the oploca-tion to change its contents. After executing the Enter Command, the selected address will appear on the screen with the cur-rent data. The data can be altered by entering new data and pressing a carriage return, or it can remain unchanged by just typing a carriage return. In either case the next address will be displayed with its data. This command can be terminated by typing a period (.) in the data field fol-lowed by a carriage return.

There is a variation of the Enter command (EN) that does not advance to the next address. Whether you enter a change and a carriage return or just a carriage return, it will display the value at the specified address only. This feature is very useful in monitoring a memory mapped I/O location.

The Format for the Enter Command is:

E ([SUPDWBT]) .Addr or

EN ([SUPDWBT]) .Addr where:

Addr - is the hexadecimal address of the data value to be dis-played for possible substitution

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8. F (Fill) Command

The Fill Command is used to fill memory with a constant. The given data value will be written to each memory location within the specified range.

The value may be a byte or a word in length, determined by the global parameters and overrides used.

The format for the Fill Command is:

F ([SUPDWBT]) Baddr Eaddr Yal Where:

Baddr - is the hexadecimal beginning address of the memory block to be filled

Eaddr - is the hexadecimal ending address of the memory block . to be filled

Val - Constant value to be used to fill the memory block

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9. G (Go) Command

The Go Command is used to start real-time emulation. The options for this command are to run without a breakpoint, or to run with temporary breakpoints as set in this command.

If the option of running without a breakpoint is selected, then any break, trigger, trace, timer or outPut conditions which have been specified on the Sequence Menu are active.

If the option for running with breakpoints from this command is selected, then it is important to note that the breakpoint is configured as an address field on op-code execution. Also, the configuration of the Event and the Sequence menus become inactive for this option.

In either case emulation will begin at the start address given or default to the current program counter. If a starting address is to be used it must be immediately adjacent to the G, otherwise it will be taken as a break-point address.

The format for utilizing the Event and Sequence menu configurations is:

G(Saddr)

The format for setting temporary breakpoints is:

G(Saddr) Braddr (Braddr2 Braddr3 Braddr4) Where:

Saddr - is the hexadecimal address where execution (real-time emulation) will begin

Braddr, Braddr2, Brad dr3 ,

Braddr4 - is a hexadecimal address where execution (real-time emulation) will stop (or break) on op-code execution

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10. I (Input) Command

This command is used to read and display the same memory address each time the carriage return key is depressed. This function is very useful when monitoring a memory mapped I/O location. The Input Command is terminated by entering a period followed by a carriage return.

The format for the Input Command is:

I ([SUPDWBT]) Addr Where:

Addr -is the hexadecimal address of the data value to be read.

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11. L (List Code) Command

This command is used to disassemble the program memory data into as-sembly language mnemonics. All data and addresses are displayed in hexadecimal.

If no ending address is specified, then one screen of disassembled mnemonics will be displayed and the command will terminate. If no beginning address is specified then the last ending address (whether entered or default) will be used as the beginning address. This allows the user to disassemble code one display screen at a time by entering the command and an initial starting address for the first display and for the next and each subsequent page only the "L" and a carriage return need be entered.

If a range is given, disassembled mnemonics will be displayed from the starting address to the ending address, scrolling the screen if necessary.

To pause a scrolling screen enter CNTRL-S and to resume scrolling another CNTRL-S or a CNTRL-Q. To terminate the command while scrolling depress the space bar or enter a carriage return.

The format for the List Command is:

L ([SUPDT]) (Baddr) (Eaddr) Where:

Baddr - is the hexadecimal beginning address of the memory data to be disassembled

Eaddr - is the hexadecimal ending address of the memory to be disassembled

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12. M (Move) Command

The Move Command is used to copy the contents of one block to the contents of another block (non- destructive move). Block one is defined with its starting and ending addresses being the first two address fields displayed, and block two is defined with its starting address being the third address field. The contents of the first memory location of block one is copied to the first' memory location of block two, and so on. The next prompt character is not displayed until the move is complete.

The format of the Move Command is:

M ([SUPDT]) Baddrl Eaddrl ([SUPDT]) Baddr2

where:

Baddrl- is the hexadecimal beginning address of the data

"Source" block

Eaddrl- is the hexadecimal ending address of the data "Source"

block

Baddr2 - is the hexadecimal beginning address of the data "Des-tination" block

The size of the "Source" block defines the number of bytes to be copied into the "Destination" block. .

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13. ME (Menu Mode) Command

This command switches the system from the current command line mode of operation to the menu mode of operation. There is an optional parameter to the menu command that allows the user to select the menu that will be displayed.

If the parameter is not used, then the last menu used will be displayed by default.

The format for the Menu Mode Command is:

ME(Selection) Where:

Selection - is one letter code representing the menu to be dis-played.

The one letter codes are:

M - Configuration Menu C - Command Menu E - Event Menu S - Sequence Menu T - Trace Menu I - Interface Menu

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HMI·200-68000 14. MT/MTL (Memory Test) Command

14. MT/MTL (Memory Test) Command

This command can be used to test memory (RAM) within the given

ad-dress range. .

The short memory test (MT) writes, reads and compares two separate bit patterns for each word within the range. The bit patterns are 5555H and AAAAH, thus cycling all bits of the word through both one and zero.

The long memory test (MTL) is a walking bit pattern. This test writes, reads and compares the word while having only one bit in the word on at a time. This is done by using the Hexadecimal values 1, 2, 4, 8, 10, 20 ---- 8000 for each word within the range.

In either test, any read not comparing with what was written into a loca-tion will cause the address, data written and data read to be displayed on the next line of the screen.

The format for the Memory Test command is:

MT ([SUPDT]) Baddr Eaddr

The format for the long Memory Test command is:

MTL ([SUPDT]) Baddr Eaddr Where:

Baddr - is the hexadecimal beginning address of the memory block to be tested.

Eaddr -is the hexadecimal ending address of the memory block to be tested.

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15. 0 (Output) Command

. This command is used to write to a memory address each time the car-riage return key is depressed. This function does not increment the ad-dress and is very useful when testing a memory mapped I/O location.

The output command is terminated by entering a period followed by a carriage return.

After the command has been executed, the last value entered will be out-put each time a carriage return is entered. The data value can be changed simply by typing a new value before entering a carriage return.

The format for the Output command is:

o

[(SUPDWBT)]

Addr,

Yal . Where:

Addr - is the hexadecimal address of the memory location which is to be written to.

Val - is the constant value which is to be written.

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16. PD (Programmable DTACK) Command

This command is used to program the emulator to insert a predefined number of wait states' into each memory cycle. Each wait state is one clock cycle in length. The wait states are inserted on any 'memory cycle in which the emulator is supplying the DTACK signal. The wait states are programmed by typing:

PD count Where:

Count - is the number of wait states to be inserted within the range 0-254.

Typing PD < CR > will show the current number of wait states selected.

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HMI-200-68000

Im Dokument HMI 200 SERIES (Seite 79-93)