JPS60100236A - Storage system for state history - Google Patents

Abstract

PURPOSE:To trace the states of all channels at a time without increasing the capacity of tracer memory by masking plural channels successively and tracing them according to predetermined priority. CONSTITUTION:Mask means 3-1-3-n are initialized and their outputs are inputted to gate means 4-1-4-n through signal lines 12-1-12-n and ANDed with a specific signal generated when a channel is in use. A priority means 5 generates a channel number having top priority among signals with a logical value ''1'' and a selecting means 2 selects one channel. Thus, the channel is selected and the mask means 3-1-3-n are reset to interrupt the writing to a tracer memory means 9 when the tracing up to the channel with the lowest priority is completed or when there are not any channel in use more, and the selection is restarted at a channel with high priority.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an internal state N history storage system in an information processing device.

(Prior art) Conventionally, when an information processing device detects an abnormality during operation and stops operating, one of the means to investigate the cause of the failure is to send appropriate signals inside the device until the abnormality is detected. Please remember it as a status history.
A tracer memory method was used to investigate the cause by conducting a plating analysis.

However, in a channel control device that multiplexly controls a plurality of channels at the same time, it is difficult to store the states of all channels because the capacity of the tracer memory means is limited. Therefore, when tracing the state of a channel, it is necessary to analyze the information, identify the channel, specify the connected channel, and wait for a failure to occur again. For this reason, there was a drawback that necessary information could not be collected at once, and failure analysis could not be easily performed.

(Object of the Invention) An object of the present invention is to eliminate the above drawbacks by sequentially masking a plurality of channels and tracing them according to a predetermined priority order, without increasing the capacity of the tracer memory means. The object of the present invention is to provide a state history storage method configured to trace the states of all channels at once.

(Structure of the Invention) The state history storage method according to the present invention is an improvement in a channel control device that controls a plurality of channels and includes tracer memory means for storing the internal state history of the information processing device.

According to the present invention, the above system is realized by comprising a plurality of mask means, a plurality of gate means, a priority means, a reset generation means, a 1 determination means, and a 1 selection means.

The plurality of masking means are for sequentially masking the plurality of channels corresponding to each of the channels of multiple copying.

The plurality of gate means are for ANDing specific signals from the plurality of channels corresponding to the plurality of masking means and the output of the multi-V masking means.

The priority means is for determining the corresponding channel number based on the respective outputs of the plurality of gate means.

The reset generating means is for resetting the plurality of masking means by modifying the output of the priority means.

The determining means is for determining whether the outputs of the plurality of gate means are predetermined values.

The selection means is for selecting one of the plurality of channels based on the output of the priority means.

In the present invention, the output of the priority means and the internal states of the plurality of channels selected by the one selection means are simultaneously written into the tracer memory means based on the output of the determination means, and the channel is given priority over the channel selected by the reset generation means. The mask is reset for a channel with a high degree of intensity, and if the state of the output of the determining means is a logical value 1, the mask is set to an initial state.

(Example) Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an information processing apparatus for realizing a state history storage method according to the present invention. In FIG. 1, 1-1 to 1-n are first to nth masking means, 4-1 to 4-n are first to nth gate means, 5 is priority means, Reference numeral 6 designates a determination means for determining all 0s, 7 a reset generation means, 8 a channel control device, and a 9-digit tracer memory means.

In FIG. 1 showing an embodiment for realizing the present invention, signals specifying the first to nth channels 1-1 to j-n (for example, channel in use) are transmitted to signal lines 10-1 to 10-10. −
n, and the corresponding first to nth masking means 3-1
~3-n outputs are output to signal lines 12-1~12-n, both of which are connected to first~nth gate means 4-1~4-n.
is input to. First to nth gate means 4-1 to 4-n
The output is sent to the priority means 5 via signal lines 1-1 to 16-n.
, and is input to the determination means 6. The output of the priority means 5 is sent to the selection means 2 and the reset generation means 7 via the signal line 15.
and is input into the tracer memory means 9. The outputs of the reset generating means 7 are respectively transmitted via signal lines 16-1 to 16-n. The output of the determining means 6 is inputted to the first to nth masking means 6-1 to M-n and the tracer memory means 9 via the signal line 17.

Furthermore, the internal state signals of the first to n-th channels 1-1 to 1-n are sent to the selection means 2 through signal lines 11-1 to 11-n.
The output of the selection means 2 is inputted to the tracer memory means 9 via the signal line 18, and the internal state signal of the channel control device 8 is inputted to the tracer memory means 9 via the signal line 19.

Next, the present invention will be explained in detail. When the information processing device starts operating, the first to nth masking means 6-1 to 3-n are set to the initial state, and all channels can be selected, and their outputs are sent to the signal lines 12-1 to 12-n. 12-n to the first to nth gate means 4-1 to 4-n, and a specific signal of each channel, for example, a signal indicating that the channel is in use, is inputted to the first to nth gate means 4-1 to 4-n via signal lines 10-1 to 10-n. The first to correspond to
The signals are input to the n-th gate means 4-1 to 4-n.

In the first to nth gate means 4-1 to 4-n, the output of the mask and the specific signal are ANDed. 1st
The outputs of the to n-th gate means 4-1 to 4-n are input to the priority means 5 via signal lines 13-1 to 16-n.

In the priority means 5, the signals on the signal lines 16-1 to 16-n generate the channel number with the highest priority among the signals of logical value 1, and the signal is inputted to the selection means 2 via the signal line 15 as an output. Ru. The selection means 2 uses the channel number on the signal line 15 to indicate the internal state of the channel IVJ! 11-1～
11-n. The output signal of the selection means 2 is
It is input to the tracer memory means 9 via the signal line 18. At this time, the determining means 6 simultaneously determines whether the outputs of the first to nth gate means 4-1 to 4-n are all 0, and if they are not all 0, the outputs on the signal line 17 are The output is set to 0 and input to the tracer memory means 9. When the logic value of the input on signal line 17 is 0, the current channel number (on signal line 15) and the channel internal state (
(on signal line 18) and the internal state of channel control device 8 (on signal line 19) are written into the same word of tracer memory means 9. Further, the reset generating means 7 generates a reset signal for the higher-order channels (including the channel number) whose value is higher than the channel number (on the signal line 15) at that time, and generates a reset signal on the signal lines 16-1 to 16-1. n to reset the corresponding masking means 3-1 to 6-n. Next, by the masking means 3-j whose contents have been updated (assuming that the j-th contents have been updated), an in-use channel having a lower priority than the previously selected channel is similarly selected. The internal state together with the channel number is then written into the next word location within the tracer memory means.

As described above, by sequentially selecting channels and resetting the masking means 6-1 to 6-n, even when tracing is completely completed up to the channel with the lowest priority, or even in the middle of tracing, When there are no channels in use with lower priority, the output of the means 6 for determining whether the data on the signal line 17 is O)LO is 1.
becomes. Along with that, first to nth masking means 6-1
The contents of ~3-n are all set to logical 1, and again,
Selection starts from the higher priority channel.

In this way, until a tracer stop condition (not shown) occurs, the tracer memory means 9 sequentially and time-shared select channels in a particular state (e.g. channel busy), thereby updating the internal state. Can be memorized.

In this embodiment, the masks are reset sequentially, but by prohibiting the operation of the mask reset means and setting only a specific mask means, it is possible to trace only the internal state of a specific channel. Of course.

(Effects of the Invention) As explained above, the present invention is effective without increasing the memory capacity of the tracer memory means by configuring the internal states of the channels of the number of tanks to be time-divided and written to the tracer memory means. This has the advantage that trace data for failure analysis can be obtained.

FIG. 1 is a block diagram showing one embodiment of a state history storage device according to the present invention.

1-1~1-n-〇〇 channel device 2... Selection means 6-1 to 6-n・e・mask means 4-1 to 4-nIIll・Gate means 5...Priority method 6... Judgment means 7@・・・Reset generation means 8th race...Channel control device 9e-・Tatami・Tracer memory means 10-1 to 10-n, 11-1 to 11-n.

15.16-1 to 16-n, 17, 18.19...
・Signal line patent applicant: NEC Corporation Representative, Patent attorney: Juga Inoro 1 Figure 7

Claims (1)

[Scope of Claims] In a state history storage method for a channel control device including tracer memory means for controlling a plurality of channels and storing an internal state history of the information processing device, a plurality of masking means for sequentially masking the plurality of channels by using a plurality of masking means; and a plurality of masking means for ANDing a specific signal from the plurality of channels corresponding to the plurality of masking means and an output of the plurality of masking means. a plurality of gate means; a priority means for determining a corresponding channel number based on the respective outputs of the plurality of gate means; and a rate generation for resetting the plurality of mask means according to the output of the priority means. means and
determining means for determining whether or not the outputs of the plurality of gate means are predetermined values; . The selection means writes the internal states of the plurality of channels selected at the same time into the tracer memory means, and the reset generation means resets the mask for a channel having a higher priority than the selected channel. . A state history storage system characterized in that the mask is configured to set the mask to an initial state if the state of the output of the determining means is a logical value 1.