JPH05210469A - System for externally storing latch data - Google Patents

Abstract

PURPOSE:To facilitate debugging or fault analysis by editing signals generated from a central processing unit and outputting them to an external storage device or a printer. CONSTITUTION:The signals generated in a central processing unit 7 are written in an internal buffer 2 and recorded in an arbitrary external storage device or the like by an external latch data output control part 1 corresponding to the type of the desired external storage device to be referred to. Thus, efficiency for debugging or fault analysis can be considerably improved by storing or outputting a change in the state of executing a program corresponding to the purpose of a user.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a latch data external storage system, and more particularly to a latch data external storage system for extracting a signal generated by a central processing unit such as a personal computer and outputting it to a printer.

[0002]

2. Description of the Related Art In a conventional latch data external storage system, in order to refer to the execution state of a target program such as a personal computer, a dedicated program is started and only a certain state is designated as an external storage. It is output to a device or the like, or a place to be referred to is predicted in advance, an interrupt is generated immediately before that, and then a manual operation is performed for each instruction to output a list to the printer for reference.

[0003]

The above-mentioned conventional latch data external storage system is used to refer to the execution state of the target program and is temporarily stored when a human interrupt or a central processing unit interrupt occurs. From a stopped state, a person manually refers to the contents of a series of program counters by displaying them on a CRT screen or outputting them to a printer while manually pressing the keyboard one command at a time. It has the drawback of having to spend. Also, in the conventional latched data external storage method, since only the state of the data at the time when the execution is stopped, such as when an interrupt occurs in the central processing unit, is left, how is the value changed before the stop? There is a drawback that the execution speed of the target program is significantly slowed down because the process of changing the data is unknown and the central processing unit has to be suspended for each reference.

[0004]

The latch data external storage system of the present invention comprises an internal buffer for storing latch data obtained from a central processing unit having a control unit, an arithmetic unit and a register unit, and the latch. An external output control unit for editing and outputting data according to an arbitrary external storage device type is provided.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a functional block diagram showing an embodiment of the present invention. Latch data external storage device 8 shown in FIG.
Controls the timing of taking out signals generated in the control unit 3, the arithmetic unit 4, the components of the register unit 5 and the main storage device 6 in the central processing unit 7, and stores the taken out signals in the internal buffer 2. A latch data external output control unit 1 for controlling address snorting, and an internal unit for storing latch data of a signal taken out by the latch data external output control unit 1 from each component of the central processing unit 7 and the main storage unit 6. The printer 9, the flexible disk device 10 and the hard disk device 11 which store and output the latched data including the buffer 2 are connected.

Further, as shown in FIG. 1, the central processing unit 7 controls the entire computer system to check the operation of each component and the state of the result of the four arithmetic operations, the logical operations and the processing. Arithmetic unit 4 for checking and performing necessary processing
And a register unit 5 for temporarily storing data used in the arithmetic unit 4 with a predetermined capacity.

While executing the program in the central processing unit 7,
Latch data external output control unit 1 by a signal from the control unit 3
Collects data transferred among the arithmetic unit 4, the register unit 5, and the main storage device 6 and stores it as latch data in the internal buffer 2, and stores or saves the collected data as necessary. Alternatively, the data can be edited according to the type of external storage device to be output, and can be written or printed in the respective printer 9, flexible disk device 10 or hard disk device 11,
The usage format can be selected according to the intended use.

The timing of collecting the data can be arbitrarily selected when printing or when writing the data, or at any time when an interrupt occurs.

Further, since the internal buffer 2 can always collect and hold data in the middle of processing, the held data can be used for trace of failure analysis or performance test to distinguish each external output device. Instead, it is the latch data external storage device 8 capable of selecting the sampling of data according to the format to be used.

[0011]

As described above, according to the present invention, a change in latch data is output to a printer, referred to in a list, or stored in another external storage device.
By using the dedicated program, it is possible to significantly improve the efficiency of debugging and failure analysis of the program, and to store the information in a portable external storage device so as not to limit the reference location.

Further, according to the present invention, the signals generated by the central processing unit are sampled by the latch data output unit, so that the list output to the printer or other external storage unit can be performed without affecting the execution of the target program. Refer to the contents stored in etc. by using a dedicated program,
It is possible to grasp the execution state of a program such as a personal computer.

[Brief description of drawings]

FIG. 1 is a functional block diagram of an embodiment of the present invention.

[Explanation of symbols]

 1 Latch data external output control unit 2 Internal buffer 3 Control unit 4 Calculation unit 5 Register unit 6 Main storage device 7 Central processing unit 8 Latch data external storage device 9 Printer 10 Flexible disk device 11 Hard disk device

Claims (1)

[Claims] 1. An internal buffer for storing latch data for extracting a signal generated in a central processing unit, which comprises a control unit, an arithmetic unit, and a register unit, and the latch data edited according to an arbitrary external storage device type. And an external output control section for outputting the data as a latch data external storage system.