JPH04142626A - Stop control circuit for microprocessor - Google Patents

Abstract

PURPOSE:To find an execution path of a present processor quickly and to carry out highly efficient evaluation by providing the processor with the function that in addition to stopping the processor operation when address coincidence condition is satisfied, the processor is stopped when the address enters in a set range and a microinstruction coincides with a set pattern. CONSTITUTION:The third and fourth registers 300 and 310 hold the upper limit address and the lower limit address where a microprocessor 100 stops and can be accessed from a diagnostic processor. The fifth register 320 holds a microinstruction stored in an address where it is desired to stop the microprocessor 100 and can be accessed from the diagnostic processor. Further, the sixth register 330 holds operation modes of stop circuits 460-480 and can be accessed from the diagnostic processor 330. Furthermore, the first circuits 460 and 480 issue a stop request, if the value of the 6th register 330 satisfies the conditions set in the first and 4th registers 200 and 310, to the microprocessor 100. With this, the execution path of the processor can be found quickly and highly efficient evaluation can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stop control circuit for a microprocessor, and more particularly to a stop control circuit for a microprocessor used in a microprogram control type information processing apparatus.

[Conventional technology]

In conventional microprocessor stop control circuits, the operation of stopping the microprocessor on the condition of address matching is widely used to evaluate microprogram control type information processing devices. This is usually done by a device evaluator to check whether the microprogram progresses to a specific address, or after proceeding to a specific address and stopping the processor, having the processor execute one microinstruction at a time. It is used to check the subsequent action by step action. Then, it instructs the diagnostic processor of a mode in which stopping due to address matching is valid, and also instructs the diagnostic processor of the address at which the processor is to be stopped based on the address matching condition. Thereafter, when the processor of the information processing device to be evaluated is started, processing proceeds to the set address and the processor stops.

[Problem to be solved by the invention]

The conventional microprocessor stop control circuit described above is
By stopping the processor due to an address match, it is possible to check that the processor processing has progressed to a specific address, or to check the processing after stopping at a specific address, so it is possible to check whether abnormal processing, state transition reporting processing, etc. have been executed. It turns out that
When control is passed from multiple processes to an entry for a specific process, it is not known which route the processor has used to process the process, so select an appropriate address for each route and try again in a mode that stops on address match conditions. , it has the disadvantage that the efficiency of evaluation work is low because it operates the processor.

[Means to solve the problem]

The stop control circuit of a microprocessor in a misfiring HA includes a first register that holds the address of a microinstruction output by the microprocessor using a microprogram control method, and a second register that holds the microinstruction output by a control memory.
registers, third and fourth registers that hold upper and lower limit addresses at which the microprocessor stops and are accessed by a diagnostic processor, and hold microinstructions stored at addresses where the microprocessor is desired to stop. and the fifth accessed from the diagnostic processor.
a sixth register that holds the operating mode of the stop circuit and is accessed by the diagnostic processor; and a value of the sixth register that satisfies the conditions set in the first and fourth registers. and a first circuit that issues a stop request to the microprocessor.

〔Example〕

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

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a flowchart for explaining the operation of this embodiment.

The microprocessor 100 uses the microinstruction address A
D is output to the control memory (hereinafter referred to as C3) 110, and C8110
Receives microinstructions from and executes them. The first register (
ADR (hereinafter referred to as ADR) 200 holds the microinstruction address output by the microprocessor 100 in synchronization with the basic clock of the microprocessor. The second register (hereinafter l
N5T) 210 holds the microinstructions output by C3lIO in synchronization with the basic clock cycle of the microprocessor 100. Third register (hereinafter referred to as ADR1) 300. Fourth
register (hereinafter referred to as ADR2) 310, the fifth register (hereinafter referred to as ADR2)
TlN5T) 320, sixth register (M) 3
The 30 register groups are connected by serial paths and accessed by the diagnostic processor using serial data.

The ADR1 register 300 and ADR2 register 310 specify the range of microinstruction addresses to stop the processor.1. ADRl holds the lower limit of the address, and ADR2 holds the upper limit of the address. Comparators 400 and 410 output "1" for inputs A and B when APR is present. Therefore A
The ND gate 430 outputs "1" when the outputs of the comparators 400 and 410 are both "1", that is, when the address is ADR1≦ADR≦ADR2.

The TIN5T register 320 holds the microinstruction stored at the microinstruction address to be stopped. The exclusive OR circuit 42 combines the contents of lN5T210 and TlN5T3.
When the contents of 20 match, "1" is output. When the M register of the mode register is “O”, the output of the gate 430 is “
l", the HLT signal becomes valid for the processor through gates 440, 460, and 480, stopping the processor. In other words, when the M register 330 is O", ADR1≦
When the address of ADH≦ADR2, the microprocessor 100 is stopped. This is an extension of the normal stop on address match. Of course, if ADR1=ADH2, the stop condition is at a certain specific address (=ADR1). Next, M register is “1”, gates 440, 45
The output of the gate 420 is “1” through 0°470.480.
” and the output of the gate 430 is “1”, a stop request is output to the processor. In other words, ADRI≦AD
When H≦ADR2 and lN5T”=TINST, the processor is stopped.

Next, the operation when the M register is "1" will be explained with reference to FIG. Suppose that when a certain test is executed, it is found that the microprocessor executes abnormality processing 4.

This may indicate that an abnormal process was executed when looking at the operation of the information processing device from an external interface, or it may be that M=0, ADR1=ADR2 was operated as the start address of abnormal process 4, and the processor stopped. Sometimes I do. Since abnormality processing 4 has three routes, it is unclear which of the three routes was executed just by the fact that the abnormality processing was executed. Therefore, M is set to 1, and a mode in which the microinstruction-dispersed circuit is enabled is selected. Write REGX to each of the three routes
The bit pattern of this instruction is set in the TIN5T register 320.

Also, write steps 1 and 2.3 in Figure 2.
A to include the addresses of the three microinstructions of REGX.
DR1 and ADR2 are set, and the processor is operated with M=1. Since the processor executes either step 1 or 2.3 before proceeding to the abnormality processing in step 4, it will stop at either of them, and therefore, by looking at the microinstruction address after stopping, it is possible to know which route the processor took. I can do it.

〔Effect of the invention〕

As explained above, in the present invention, in addition to the normal stop circuit based on address match conditions, the processor is stopped when an address falls within a set range and a microinstruction matches a set pattern. Even if the microprogram is configured to merge from the processing section to the common processing section, the execution path of the processor can be quickly clarified and the efficiency of evaluation can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a flowchart for explaining the operation of this embodiment. 100... Microprocessor, 110... Control memory (C8), 200... First register (ADR),
210...Second register (INST), 300...
・Third register (ADRI), 310...Fourth register (ADR2), 320...Fifth register (
TINST), 330...6th register (M), 4
00,410...Comparator, 420...Coincidence detection circuit, 430,440,450,460,470.480.
··Gate.

Claims (1)

[Claims] 1. A first device that holds the address of a microinstruction output by a microprocessor using a microprogram control method.
a second register that holds microinstructions output by the control memory; third and fourth registers that hold upper and lower limit addresses at which the microprocessor stops and are accessed by the diagnostic processor; a fifth register that holds a microinstruction stored at an address at which the microprocessor is desired to be stopped and is accessed by the diagnostic processor; and a sixth register that holds an operating mode of the stop circuit and is accessed by the diagnostic processor. and a first circuit that issues a stop request to the microprocessor when the value of the sixth register satisfies the conditions set in the first and fourth registers. Stop control circuit. 2. A second circuit that issues a stop request to the processor when a mode other than the above is specified in the sixth register and conditions set in the first, second, third, and fourth registers are satisfied. 2. The microprocessor stop control circuit according to claim 1, further comprising: