JPH03189834A - In-circuit emulator - Google Patents

Abstract

PURPOSE:To improve the debug efficiency of a software by providing a clear event detecting function so that a break can be applied in some specific sequence in a repeat loop. CONSTITUTION:When a state of an emulation bus 2 and a condition set in advance coincide with each other, in the case a logical operation part 6 is in an output permitted state, event detecting function parts 3, 4 output a coincidence signal to storage function parts 7, 8. A clear event detecting function part 5 monitors whether the state coincides with the condition set in advance or not, and when it coincides, in the case the logical operation part 6 is in an output permitted state, a coincidence signal is outputted to the storage function parts 7, 8. Accordingly, when the coincidence signal from the clear event detecting function part 5 is generated during the coincidence signal from the event detecting function parts 3, 4, the logical operation part 6 does not generate a break signal, and unless the coincidence signal from the clear event detecting function part 5 is generated during the coincidences signal from the event detecting function parts 3, 4, the logical operation part 6 generates the break signal. In such a way, the debug efficiency of a software can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to in-circuit emulators, and more particularly to a method of event detection.

[Conventional technology]

Conventionally, the event detection function of an in-circuit emulator has been such that after detection, information stored in a storage section is cleared only by an operation by an operator of the in-circuit emulator using a command or the like.

[Problem to be solved by the invention]

The conventional in-circuit emulator described above cannot clear the contents stored in the storage function section in real time, so a program like the flowchart shown in FIG. 2 continues through block A and moves to block B. When attempting to generate a break signal only when passing through blocks A-+C-+D-+B, there is a drawback in that a break signal will also be generated when passing through blocks A-+C-+D-+B.

[Means to solve the problem]

The in-circuit emulator of the present invention has a plurality of event detection function units and a memory function unit that stores each signal output from the event detection function unit, and performs a logical operation on the signals output from the memory function unit. In an in-circuit emulator that has an arithmetic unit and can generate a break signal, etc. with the output from the arithmetic unit, the clearing function is used to clear information on the occurrence status of events stored in the memory function unit. It is configured to include an event detection function section.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

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

The emulation unit 1 emulates the operation of the target CPU and outputs the operating state of the emulation bus 2.

The event detection function section 3.4 is the emulation bus 2.
connected to.

The clearing event detection function section 5 is also connected to the emulation bus 2.

The event detection function units 3 and 4 and the clearing event detection function unit are connected to the logic operation unit 6, and their operations are controlled by signals from the logic operation unit 6.

The storage function units 7 and 8 are connected to the event detection function units 3 and 4, respectively, and are connected to the clearing event detection function unit 5. The logic operation section 6 is connected to the storage function section 7.8. The emulation section 1 is connected to the logic operation section 6.

Next, the operation in this embodiment will be explained.

The emulation unit 1 emulates the operation of the target CPU and outputs the operating state to the emulation bus 2.

The event detection function units 3 and 4 are connected to the emulation bus 2.
Monitor whether the status of the device matches preset conditions.

The event detection function section 3.4 is the emulation bus 2.
When the condition matches the preset conditions,
If the output from the logic operation unit 6 is in the output permission state, a match signal is output to the storage function units 7 and 8.

The clearing event detection function unit 5 monitors whether or not it matches a preset condition, and when it matches, if the output from the logic operation unit 6 is in the output permission state, outputs a match signal to the storage function unit 7.8. do.

The storage function section 7.8 stores the coincidence signals from the event detection function sections 3 and 4, and clears the stored contents with the coincidence signal from the clearing event detection function section 5.

The storage function section 7.8 outputs its stored contents to the logic operation section 6.

The logic operation unit 6 outputs a break signal to the emulation unit 1 when the signals from the storage function units 7 and 8 both indicate that there is a match.

Therefore, if a match signal from the event detection function unit 5 for clearing occurs between the match signals from the event detection function units 3 and 4, the logic operation unit 6 does not generate a break signal, and the event detection function units 3 and 4 If no match signal is generated from the clearing event detection function section 5 between the match signals of , the logic operation section 6 generates a break signal.

〔Effect of the invention〕

As described above, by having the clearing event detection function, the present invention can cause a break in a specific order in a repeat loop, and has the effect of improving the efficiency of software debugging.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a flowchart of an example of an emulated program. DESCRIPTION OF SYMBOLS 1... Emulation section, 2... Emulation bus, 3... Event detection function section, 4... Event detection function section, 5... Event detection function section for clearing, 6... Logical operation Section, 7... Memory function section, 8...
Memory function part.

Claims (1)

[Claims] a plurality of event detection function units and a storage function unit that stores each signal output from the event detection function unit; a calculation unit that performs a logical operation on the signal output from the storage function unit; The in-circuit emulator is capable of generating a break signal, etc. with the output from the in-circuit emulator, and includes a clearing event detection function section for clearing information on the occurrence status of events stored in the memory function section. An in-circuit emulator featuring