JPH0844588A - Software development supporting device - Google Patents

Abstract

PURPOSE:To make the repeat of a sequentially valid condition as a generating condition for a trigger. CONSTITUTION:An event trigger circuit is equipped with a sequential pulse counter 30. The sequential pulse counter 30 consists of a register 10 and a down-counter 11. The sequential pulse counter 30 is a counter to detect first valid condition, and also, to count the number of times of satisfaction of a second valid condition under the condition that the first valid condition is detected. When a count value counted by the sequential pulse counter 30 arrives at a prescribed value, a trigger signal is generated. When the second valid condition is detected, comparators 1, 2, control gates 3, 4 and counters 8, 9 are initialized, then, a detection standly state is set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a software development supporting device, and more particularly to a device for detecting an event and generating a trigger.

[0002]

2. Description of the Related Art Conventionally, a software development support device for a microprocessor is generally a circuit that generates a signal (trigger signal) for controlling execution and interruption of a program, storage of trace information, etc., that is, an event trigger circuit. Is equipped with.

This event trigger circuit includes a condition (event) designated by a user, address information, data information,
Information such as status information is compared, and a trigger signal is generated based on the comparison result.

FIG. 2 shows the configuration of a conventional event trigger circuit. This event trigger circuit includes comparators 12 to 15, control gates 16 to 19, and register 2
1 to 24, down counters 25 to 28, and a sequential control unit 20.

The comparators 12 to 15 have conditions (events) designated by the user, address information, data information,
Information such as status information is compared, and a match signal is output when the two match.

The control gates 16 to 19 are the comparator 1
2 to 15 match signals output from the down counter 25
~ 28 to determine whether to transfer. When the set condition and the input value match, down counter 25-2
8 decrements the data set in the registers 21 to 24.

When the down counters 25 to 28 reach 0, the sequential control unit 20 generates a trigger signal and executes a break. The registers 21 to 24 store the data to be reloaded to the down counters 25 to 28.

The detection of the second satisfaction condition after the detection of the first satisfaction condition is called sequential event detection. That is, until the down counter 25 reaches 0, the control gate 17 controls the comparator 13, the control gate 18 controls the comparator 14, and the control gate 19 controls.
The respective comparators 15 are stopped by.

Similarly, until the down counter 26 reaches 0, the control gate 16 controls the comparator 12, the control gate 18 controls the comparator 14, and the control gate 19 controls.
The respective comparators 15 are stopped by.

Hereinafter, the same applies to the down counters 27 and 28. The conventional technique will be described with reference to the program shown in FIG. A condition A that the process 1 in the program is executed and a condition B that the process 2 in the program is executed are set, and when the process 2 is executed after the process 1, a trigger signal is generated to break. An example of making an operation will be described.

If the set condition A is met, the control gate
A match signal is output from the switch 16 to the down counter 25. The numerical value preset in the register 21 is set in the down counter 25, and when a signal is received from the control gate 16, the numerical value set in the down counter 25 is decremented.

Until the down counter 25 reaches 0, the control gate 17 does not give the signal detected by the comparator 13 to the down counter 26, and the control gate 18
The down counter 27 detects the signal detected by the comparator 14.
The control gate 19 does not apply the signal detected by the comparator 15 to the down counter 28.

Similarly, after the condition A is satisfied, when the condition B is sequentially satisfied, that is, the down counter 2
When 6 is counted and becomes 0, the down counter 27 starts counting by the coincidence signal output from the next comparator 14. As described above, by using the event trigger circuit of FIG. 2, it is possible to detect up to four sequentially set conditions and generate a trigger after the conditions are satisfied.

[0014]

In the conventional event trigger circuit, when the satisfaction conditions are sequentially connected,
The number of comparators, control gates, and down counters must be increased in the event trigger circuit in accordance with the number of times the satisfaction conditions are sequentially connected.

The present invention has been made to solve the above-mentioned drawbacks, and an object thereof is to add a sequential path counter to an event trigger circuit so as not to increase the amount of hardware and to perform a sequential operation. This means that a large number of repetitions of the conditions that are linked to the above are used as trigger generation conditions.

[0016]

In order to achieve the above object, a software development support apparatus of the present invention comprises means for detecting a first satisfaction condition, and a condition for detecting the first satisfaction condition. 2, a means for detecting the satisfaction condition, a means for counting the number of times the second satisfaction condition is satisfied, and a means for generating a trigger signal when the count value reaches a predetermined value. When the condition is detected, the means for detecting the first satisfaction condition is initialized to enter the detection standby state.

[0017]

According to the above configuration, when the second satisfaction condition is detected, the means for detecting the first satisfaction condition is initialized to the detection standby state, and the count value of the number of times the second satisfaction condition is satisfied is A trigger signal is being generated when it reaches a predetermined value. Therefore, it is possible to repeat the sequential connection of the conditions satisfied without increasing the amount of hardware and without limiting the number of repetitions.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A software development support device of the present invention will be described in detail below with reference to the drawings. Figure 1
3 illustrates an event trigger circuit with a sequential path counter according to an embodiment of the present invention.

The configuration of this event trigger circuit will be described below. This event trigger circuit is composed of comparators 1 and 2, control gates 3 and 4, registers 6 and 7, down counters 8 and 9, a sequential control unit 5 and a sequential path counter 30. There is.

The comparators 1 and 2 compare a condition (event) designated by the user with information such as address information, data information, and status information, and when they match, they match. Output a signal.

The control gates 3 and 4 are comparators 1 and 2.
It is determined whether or not to transfer the coincidence signal output from the down counters 8 and 9. When the set condition matches the input value, the down counters 8 and 9 decrement the data set in the registers 6 and 7.

When the down counters 8 and 9 have become 0, the sequential control unit 5 generates a trigger signal and executes a break. The registers 6 and 7 store the data to be reloaded in the down counters 8 and 9.

The sequential path counter 30 is composed of a register 10 and a down counter 11.
The sequential pass counter 30 is a device that detects the first satisfaction condition and counts the number of times when the second satisfaction condition is satisfied on the condition that the first satisfaction condition is detected. is there.

When the count value counted by the sequential path counter 30 reaches a predetermined value, a trigger signal is generated. When the second satisfaction condition is detected, the comparator 1, the control gate 3, and the down counter 8 which detect the first satisfaction condition are initialized to be in the detection standby state.

Next, the event trigger circuit of FIG. 1 will be described using the program of FIG. When the input value and the set condition A match, the comparator 1 outputs a match signal to the down counter 8 via the control gate 3.

The numerical value set in the register 1 is set in the down counter 8 in advance, and when a signal is received from the control gate 3, the numerical value set in the down counter 8 is decremented. Further, the control gate 4 does not apply the signal detected by the comparator 2 to the down counter 9 until the down counter 8 becomes 0.

Similarly, after the condition A is satisfied, when the condition B is sequentially satisfied, the down counter 9 is counted, and when the down counter 9 becomes 0, the sequential pass counter 30 is once. Is counted.

The numerical value set in the data register 10 (the number of times the condition for succession that is sequentially connected is repeated) is set in the down counter 11, and the sequential control unit 5
If the signal is received from, the value set by the down counter 11 is decremented. When the down counter 11 reaches 0, a trigger signal is generated and the break is executed.

[0029]

As described above, the software development support apparatus of the present invention has the following effects. The event trigger circuit is provided with a sequential path counter that is sequentially connected to count the outputs of the satisfaction conditions. As a result, without increasing the amount of hardware and without limiting the number of repetitions,
Sequentially connected conditions can be repeatedly satisfied.

[Brief description of drawings]

FIG. 1 is a block diagram showing an event trigger circuit according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional event trigger circuit.

FIG. 3 is a flowchart showing an example of a program.

[Explanation of symbols]

1, 2, 12 to 15 ... Comparator, 3, 4, 16 to 19 ... Control gate, 5, 20 ... Sequential control section, 6, 7, 10.21 to 24 ... Register, 8, 9 , 11, 25 to 28 ... Down counter, 30 ... Sequential path counter.

Claims (1)

[Claims] 1. A means for detecting a first satisfaction condition, a means for detecting a second satisfaction condition on the condition that the first satisfaction condition is detected, and the number of times the second satisfaction condition is satisfied. And a means for generating a trigger signal when the count value reaches a predetermined value, and initializes the means for detecting the first satisfaction condition when the second satisfaction condition is detected. A software development support device characterized by putting it in a detection standby state.