JPH01305364A - Trigger generating apparatus of logic scope - Google Patents

Abstract

PURPOSE:To make it possible to shorten a time required for observation even for signals whose occurring frequency is less by storing a plurality of trigger patterns, comparing the patterns with the signals to be observed, and setting a trigger. CONSTITUTION:Observed input signals I1, I2,...Im are inputted into a register part 11. A part of the signals is sampled with a clock 110 or all signals are latched, and the signals are sent out to a trigger detecting part 13. A plurality of trigger patterns 121 are stored in a trigger pattern memory part 12. In the detecting part 13, the output of the register part 11 are sequentially compared with the patterns 121. Every time when any one agrees, a trigger detecting output 1301 is supplied to a trigger generating part 14. When a trigger generating part 14 receives the output 1301, an input trigger 141 having a specified pulse width is sent out. In this way, the generating conditions of the input trigger are remarkably alleviated. The observed input signals I1, I2,...Im which are inputted into a logic scope can be observed in a shortened time.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a trigger generation device for a logic scope.

[Conventional technology]

Logic data is sent to multiple channels with logical value “0”,”
The Rossi'-Tux scope, which is expressed in the 1° Lebel representation format, is well known.

Conventionally, the trigger method for triggering the input prosthetic hand of this type of logic scope is to use the logical product of a combination of signal levels of multiple logic inputs, usually about two signal levels, i.e., one of 2612.) It was set in such a way that if the input signal exceeds the trigger level, an input trigger is generated that allows all signal inputs to be displayed.

[Problems that the invention attempts to solve]

In the conventional triggering method described above, when multiple triv′ conditions are possible, each ! -, Since it is necessary to set and observe conditions, there is a disadvantage that it inevitably takes a lot of time even when observing signals that are infrequent.

SUMMARY OF THE INVENTION An object of the present invention is to provide a trigger generation device for a logic scope that eliminates the above-mentioned drawbacks and can significantly shorten the time required even for infrequently observing signals.

[Means to solve the problem]

The device of the present invention is a register unit that partially samples or latches all of a plurality of input signals to be observed at a predetermined clock in a logic scope trigger generation device that generates an input trigger of a logic scope that displays logic data. (a) a trigger bang storage unit that stores a plurality of types of trigger bangs in which trigger conditions for inputting the plurality of input signals to the logic scope are set; and an output of the register unit and the trigger bang storage unit that stores the outputs of the register unit;
The trigger detecting section generates a trigger detection output when a trigger pattern is compared with any one trigger button, and the trigger generating section generates an input trigger of the logic scope based on the trigger detection output. Ru.

〔Example〕

Next, the present invention will be described in detail with reference to the drawings.

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

The embodiment shown in FIG. 1 includes a shift register section 11 which partially samples a plurality of input signals to be observed at a predetermined clock, but latches all of them. A trigger pattern storage section 12 stores a plurality of types of trigger patterns, and compares the output of the shift register 11 with the trigger pattern stored in the trigger pattern storage section 12, and if there is a match at least one, outputs a trigger detection output indicating that fact. Trigger detection unit 13 that occurs. The logic scope is configured to include a trigger generation section 14 that generates an input trigger that enables input of a plurality of input signals to the logic scope upon receiving a trigger detection output.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

The register unit 11 receives 11+I2+...I of the observation input signal 10 inputted via the input terminal 101.

is branched and input, a part of it is sampled by the clock 110, or all of it is latched, and then sent to the trigger detection section 13.

Whether it is a sample or a latch can be arbitrarily set in accordance with a trigger pattern provided in the trigger pattern storage section 12, which will be described later.

The trigger pattern storage unit 12 stores a plurality of preset trigger patterns. This trigger pattern is based on the observation input signal 10.・・・・・・I
When the level of □ satisfies this condition, both are set as input trigger generation conditions for generating an input trigger that allows input to the logic scope.

The detection unit 13 compares the output of the register 11 with each of the trigger patterns 121 stored in the trigger pattern storage circuit 12, and outputs a trigger detection output 1301 when it matches any one of them, and outputs a trigger detection output 1301 to the trigger generation unit 14. supply

The trigger detection unit 13 includes a number of comparison circuits (1) 131-1 . equal to the number N of trigger patterns. Comparison circuit (2) 131
-2. ...Comparison circuit (N) 131-N.

and an OR gate 132, these comparison circuits successively compare the register section 11 and various trigger patterns 121, and when at least one match occurs, an output from these comparison circuits is generated and supplied to the OR gate 132. be done. At this time, the OR gate 132 outputs a trigger detection output 1301 with a logical value of "1", which is supplied to the trigger generation section 14.

Upon receiving the trigger detection output 1301, the trigger generation unit 14 generates an input trigger 141 with a predetermined pulse width and sends it out via the output terminal 1401. By generating the input trigger in this way, the conditions for generating the input trigger can be significantly changed. The observed input signal 11+I2+...1. can be observed in a significantly shorter time.

In the above-described embodiment, when obtaining the trigger detection output 1301 from the trigger detection section 13, the comparison circuit (1) 131-1 to comparison circuit (N) outputs the output only when the output of the register section 11 and the trigger button match. Although a method is used in which the output of 131-N is supplied to the OR gate 132, it can also be easily obtained through another logic gate.

For example, comparison circuit (1) 131-1 to comparison circuit (N)
The output of 131-N is led to a plurality of AND gates each having an input line corresponding to the trigger pattern condition, and when there is an output from any of these AND gates, this can be used as a trigger detection output. considered,
And it is clear that it is easy to implement.

〔Effect of the invention〕

As explained above, the present invention stores multiple trigger patterns in the logic scope and sets the trigger by comparing this with the signal to be observed. It is possible to observe various signal states by setting triggers, and has the effect of significantly shortening observation time.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an embodiment of the present invention. 10...Observation input signal, 11...Register, 12.
...Trigger pattern storage section, 13...Trigger detection section,
14...Trigger generation section, 131-1 to 131-(N)
... Comparison circuits (1) to (N), 132 ... Logic gate, 121 ... Trigger pattern, 13o1 ... Trigger detection output.

Claims (1)

[Claims] In a trigger generation device for a logic scope that generates an input trigger for a logic scope that displays logic data, there is provided a register section that partially samples or latches all of a plurality of input signals to be observed at a predetermined clock. and,
A trigger pattern storage unit stores a plurality of types of trigger patterns in which trigger conditions for inputting the plurality of input signals to the logic scope are set, and the output of the register unit is compared with the trigger pattern stored in the trigger pattern storage unit, and one of the trigger patterns is selected. A trigger generation device for a logic scope, comprising: a trigger detection section that generates a trigger detection output if it matches a trigger pattern; and a trigger generation section that generates an input trigger for the logic scope based on the trigger detection output. .