JPH05165676A - Trace control system for microprogram controller - Google Patents

Abstract

PURPOSE:To stop a trace by an arbitrary address without stopping the execution of a microprogram by controlling the generation of an address with external information and also controlling the write of trace information. CONSTITUTION:The gate 7a of a track lock control circuit 7 is provided as an address generation control means for controlling the generation of the address of a microsequencer (address generating circuit) 1 in accordance with information from the outside (system controller), the output signal of a comparator 6 is inputted thereto, and its output side is connected to the microsequencer 1. Also, a flip-flop 7b is provided as a write control means for controlling the write of address information to a trace memory 5, the output signal of the comparator 6 is inputted thereto in the same manner and its output side is connected to a register 4. In such a manner, by constituting the system so that the generation of a microaddress in a trace inhibited state can be controlled by an operator, the execution stop of the microprogram and its continuation can be executed in accordance with a purpose.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trace control system for a micro program controller.

[0002]

2. Description of the Related Art As a trace control system of a microprogram controller, those disclosed in, for example, JP-A-2-201662 and JP-A-2-244236 have been proposed. FIG. 3 is a diagram showing an outline of a trace control method of such a conventional microprogram controller.
The structure of a micro address trace circuit is shown.

In the figure, 1 is a micro sequencer for generating a micro address, 2 is a program memory for storing a micro program, 3 is a register for storing a stop address for taking a trace, and 4 is a trace register. The address of the executed microprogram is stored in the trace memory 5 through the register 4. Reference numeral 6 is a comparator for comparing the address from the microsequencer 1 with the address from the register 3.

In the micro-address trace circuit configured as described above, when the operator (operator) traces up to the desired micro-address, first the execution of the micro program is temporarily stopped and then the purpose is reached. The micro address is set in the register 3 by the system controller (not shown). Then, when the micro program is activated, a micro address is generated by the micro sequencer 1, and the micro program corresponding to the address is output from the program memory 2 to control each hardware.

At the same time, the microaddress generated by the microsequencer 1 is recorded in the trace memory 5 via the register 4, and the address set in the register 3 and the address output from the microsequencer 1 are When the comparison result by the comparator 6 indicates a match, the output of the register 4 is suppressed and the recording in the trace memory 5 is stopped. Further, this coincidence signal is transmitted to the micro sequencer 1, the generation of addresses after the coincident address is forcibly suppressed, and the execution of the micro program is stopped.

[0006]

Since the trace control method of the conventional microprogram controller is constructed as described above, when the trace is stopped at an arbitrary address, the execution of the microprogram must be stopped. Therefore, there is a problem that the computer system cannot be executed because the microprogram cannot be continuously executed after the trace information is obtained.

The present invention has been made in order to solve the above problems, and trace control of a microprogram controller capable of stopping tracing at an arbitrary address without stopping execution of a microprogram. It is intended to provide a scheme.

[0008]

A trace control system of a microprogram controller according to the present invention comprises address generation control means for controlling an address generation circuit for generating a microaddress according to information from the outside, and information to a trace memory. A writing control means for controlling writing is provided.

Further, the trace control method of the micro program control device according to the present invention, the address generation control means for controlling the address generation circuit for generating the micro address according to the state of the control switch, and the information writing to the drace memory. And a writing control means for controlling.

[0010]

In the trace control system of the microprogram controller of the present invention, the address generation of the address generation circuit is controlled according to the information from the outside, and the writing control means controls the information writing to the trace memory.

Further, in the trace control method of the microprogram controller of the present invention, the address generation of the address generation circuit is controlled according to the state of the control switch,
The writing control means controls the writing of information to the trace memory.

[0012]

1 is a block diagram showing an outline of a trace control system of a microprogram controller according to an embodiment of the present invention, and the same reference numerals as those in FIG. 3 denote the same components. In the figure, 1 is a micro sequencer (address generation circuit) for generating a micro address, 2 is a program memory for storing a micro program, 3 is a register for storing a stop address from a system controller (not shown), and 4 is a trace. Register 5 is a trace memory for storing the address of the executed micro program, 6
Is a comparator for comparing the address from the register 3 with the address from the micro sequencer 1, and 7 is a trace lock control circuit for performing address control of the micro sequencer 1 and lock control of the write function of the trace memory 5, and the gate (here, The AND gate) 7a and the flip-flop 7b.

Gate 7 of the trace lock control circuit 7
a is provided as address generation control means for controlling the address generation of the microsequencer 1 according to information from the outside (system control device), the output signal of the comparator 6 is input, and the output side is connected to the microsequencer 1. Has been done. The flip-flop 7b is provided as a write control means for controlling the writing of address information to the trace memory 5, similarly the output signal of the comparator 6 is input, and the output side is connected to the register 4. .

Next, the operation will be described. When the trace of the micro address is taken, the operator sets the target address and the micro address generation inhibition information in the register 3 and the trace control circuit 7 via the system control device (not shown). Here, the micro address generation information is a signal of "0" or "1". For example, when the user program is continuously executed after reaching the target address, it is set to "0" and the execution of the user program is stopped. Set to "1" if you want.

When the currently executed micro address (the output address of the micro sequencer 1) matches the target address, the comparator 6 outputs a one-pulse "1" signal as a match signal. At this time, the control circuit 7
If the above inhibition information set in the
The output of "a" becomes "1", the operation of the microsequencer 1 is suppressed, and the subsequent addresses are not generated.

On the other hand, if the inhibition information is "0", the output of the gate 7a is "0" even if the addresses in the comparator 6 match, and the microsequencer 1 is not inhibited and the next and subsequent addresses are generated. Keep doing

When the currently executed address matches the target address, the flip-flop 7b is set,
The state is maintained until a reset signal is input by hardware. And this flip-flop 7b
The output of register 4 is suppressed when the output of is 1
Execution addresses after the target address are not recorded in the trace memory 5.

Since the operator can control the generation of the micro address in the trace inhibition state as described above, the execution of the micro program can be stopped or continued depending on the purpose. Therefore, failure analysis and investigation of the cause of failure are easy. Also, trace information can be acquired up to the target address without stopping the user program.

FIG. 2 is a block diagram showing another embodiment of the present invention, and the same reference numerals as those in FIG. 1 indicate the same components. In this embodiment, the trace lock control circuit 7 is provided with a control switch 7c.
The address generation of the microsequencer 1 is controlled according to the off state.

The operation of the circuit having the above-mentioned configuration is the same as that of the above-described embodiment, but the control of the micro sequencer 1 after the currently executed micro address matches the target address can be performed by the control switch 7c. For example, the control switch is turned on ("0") when the user program is desired to continue even after the addresses match, and is turned off ("1") when the user program is to be stopped.

With such a structure, as in the above-described embodiment, the trace can be stopped at an arbitrary address without stopping the execution of the microprogram. Further, in this embodiment, the trace information up to the target address can be obtained without stopping the user program without setting by the system control device each time the power of the control device main body is turned on.

[0022]

As described above, according to the present invention, the address generation is controlled by the external information, and the writing of the trace information is controlled. Therefore, it is possible to arbitrarily execute the microprogram without stopping the execution of the microprogram. The effect is that the trace can be stopped at the address.

Further, by providing the control switch, the trace information can be obtained without stopping the program even if the control device is not set each time the power is turned on.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing another embodiment of the present invention.

FIG. 3 is a block diagram showing a conventional example.

[Explanation of symbols]

 1 micro sequencer (address generation circuit) 2 program memory 5 trace memory 6 comparator 7 trace lock control circuit 7a gate (address generation control means) 7b flip-flop (writing control means) 7c control switch Or shows a considerable part.

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[Procedure amendment]

[Submission date] May 18, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

Further trace control arrangement of the micro-program control unit according to the present invention, the address producing formation control means for controlling the state of the control switch address generating circuit for generating a micro-address information to the trace memory A writing control means for controlling writing is provided.

Claims (2)

[Claims] 1. A trace control method of a microprogram control device comprising an address generation circuit for generating a microaddress and a trace memory for storing trace information of an executed microprogram, wherein the address generation of the address generation circuit is performed externally. A trace control system for a microprogram controller, comprising: an address generation control means for controlling the information according to the above information, and a write control means for controlling the information writing to the trace memory. 2. A trace control system of a microprogram control device, comprising: an address generation circuit for generating a microaddress; and a trace memory for storing trace information of an executed microprogram, wherein the address generation circuit controls the address generation. A trace control method for a microprogram controller, comprising: an address generation control means for controlling according to a state of a switch; and a write control means for controlling information writing to a trace memory.