JPS6393051A - Microprogram controller - Google Patents

Abstract

PURPOSE:To facilitate the debug of a microprogram by providing a setting device, a memory, an erasing device and a stopping device and comparing the optional set value with a microinstruction address to stop execution of the microprogram. CONSTITUTION:The microinstruction address supplied via a signal line 16 is coincident with the address value supplied via a signal line 17 at a point F of a microprogram. Thus '1' is outputted to a signal line 31. The address value is enable when a signal line 18 is set at '1' and an FF 11 is set via an AND gate 13. Then coincidence is secured between the address supplied via the line 16 and the address supplied via a signal line 19 at a point H. Then '1' is outputted from the coincidence signal inputted through an AND gate 14 and the FF 11 is reset. While '1' is outputted from a microinstruction address supplied via the line 16 and the coincidence signal inputted to an AND gate 12 from a signal line 12 when the microprogram reaches a point C with conditional branch of a point G. Then a program stop signal is outputted from the FF 11.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a microprogram control device, and particularly to a microprogram control device for microprogram evaluation.

(Prior Art) Conventionally, this type of microprogram control device has a function to stop the execution of a microprogram if an arbitrary microinstruction address is accessed during execution of the microprogram, for evaluation of the microprogram. Was.

For example, some of the above devices have a method of setting the address at which the microprogram is stopped, some set it as a range of addresses, some set it as a range of addresses, or set multiple addresses and stop the microprogram if any of the addresses is accessed. There were things to do.

These devices are used to stop the execution of a microprogram when it reaches a point C in a microprogram with a simple structure, as shown in Figure 3(a), or to stop the execution of a microprogram when it reaches a point C, as shown in Figure 3(b). Even in a microprogram with a complicated structure, it is effective to stop execution at a point such as C, regardless of the route taken.

(Problems to be Solved by the Invention) In the conventional microprogram control device described above, the third
The conventional method cannot handle a case where it is desired to stop the execution of a microprogram only when it reaches C via the path E4F-+G4C in FIG. 2B. In such cases, the conventional method is to stop the program execution at the address corresponding to E or F, reset the CK stop address, restart the microprogram execution, and then stop the execution at C. A two-step operation was required. However, even in this case, E−+F
Did the CK come via the path of -+G-+C or E-+F?
4G-+H → Engineering → ■, exit once, and return ■ → E+F-
+G-) Did you come to C via the route C, or did you come to C via the route E-+F?
It was not possible to distinguish whether the route came to C via the route →G-+H → Engineering → Φ → ■ → A4B → C.

Also, even if you can stop at the desired point by performing a two-step operation, if a microprogram is being executed there, or if processing for an asynchronous phenomenon is being executed, you may have to stop the execution once. There is a possibility that the phenomenon will change.

As mentioned above, in the conventional microprogram control device,
A drawback is that it is not always possible to stop the execution of a microprogram at the target microinstruction address.

The purpose of the present invention is to set an arbitrary first value, compare the set first value with a microinstruction address, and when the two match, store the fact that the two match. , further setting any other second value, and comparing the other set second value with the value of the microinstruction address;
When the two match, 1 Erase the memory that the first value and the microinstruction address match, set another arbitrary third value, and compare the third value with the microinstruction address. However, the above drawback can be removed by stopping the execution of the microprogram only when there is a memory that the two match, and the execution of the microprogram can be stopped at the target microinstruction address. An object of the present invention is to provide a structured microprogram control device.

(Means for Solving the Problems) A microprogram control device according to the present invention includes a setting means, a storage means, an erasing means, and a stopping means.

The setting means is for individually setting arbitrary first to third values.

The storage means is for comparing the first value and the microinstruction address and storing the first matching event when the two match.

The erasing means is for comparing the second value and the microinstruction address and erasing the first matching event when the two match.

The stopping means is for comparing the third value and the microinstruction address, and when they match, stopping the execution of the microprogram only if the first matching event remains.

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

FIG. 1 is a block diagram showing an embodiment of a microprogram control device according to the present invention. In Figure 1, 1
is a microprogram control circuit, 2 is a control memory, 3 is a microinstruction register, 4 is a microinstruction address register, 5 is a comparison address register for passing check, 6 is a comparison address register for passing check reset, T is a comparison address for stopping the program. Registers, 8 to 10 are address comparison circuits, 11 is a flip-flop, 12
.about.14 are AND gates.

In FIG. 1, the microprogram is stored in the control memory 2, and the microinstruction stored at the address indicated by the microinstruction address register 4 is fetched into the microinstruction register 3 and decoded by the microprogram control circuit 1. is executed. The microprogram control circuit 1 sets the next microinstruction address in the microinstruction address register 4 and takes out the next microinstruction.

The microprograms are sequentially executed by repeating the above operations.

The functions aimed at by the present invention can be achieved by, for example, a microprogram module as shown in FIG. 2 (2).
It is necessary to stop the execution of the microprogram only when it reaches C via the path +C, and in this case, this function is realized by performing the following operations.

In this case, the vehicle will stop when it passes through F in FIG. 2 and reaches C. Therefore, the value of the microinstruction address corresponding to F in FIG. 2 is input from the outside through the signal line 28 in FIG.
Set in comparison address register 5 for passage check in the figure,
The value of the microinstruction address corresponding to H in FIG.
The value of the microinstruction address corresponding to C in FIG. 2 is set in the pass check reset comparison address register 6 of FIG. 1 through the signal 829 shown in the figure, and the value of the microinstruction address corresponding to C in FIG. Set to .

When you start executing a microprogram with the address set as described above, the signal line 1
Microinstruction addresses are supplied to address comparison circuits 8-10 through 6. The microprogram is F in Figure 2.
When the value of the microinstruction address supplied to the signal line 16 in FIG. 1 matches the value of the address supplied to the signal line 1T, the If the state on the signal line 18 is '1', the value of the above address is enabled, and the output line 25 of the AND gate 13 outputs the signal ``11''. 7 lipflop 1 for
1 (hereinafter referred to as F/F11) is set.

After this, when the microprogram operates and reaches H in FIG. 2, the microinstruction address supplied by the signal line 16 in FIG. 1 matches the value of the address supplied by the signal line 19. , "1" is outputted by the coincidence signal input from the signal line 32 to the AND gate 14.

If the state of the signal on the signal line 20 is 11'', the address is enabled, and the pass check F/F 11 is reset by the output line 24 of the AND gate 14.

On the other hand, if the conditional branch of G leads to C without reaching H in FIG. 2, the microinstruction address is supplied to signal line 16 in FIG. Since the address values match, the AND gate 1 is connected to the signal line 23.
``1'' is output by the match signal input to ``2''.

If the state of the signal on the signal line 22 is 11#, the address value is enabled! 5. The output of F/F11 is ml"
Therefore, a program stop signal is output to the microprogram control circuit 1 through the signal 827, and the execution of the microprogram is stopped.

The above has described an example of a configuration in which each of the comparison address register 5 for passing check, the comparison address register 6 for passing check reset, and the comparison address register 7 for stopping the program is provided, but one or more of these may be provided as necessary. Needless to say, this makes it possible to support microprograms with very complex configurations.

(Effects of the Invention) As explained above, the present invention sets an arbitrary first value, compares the set first value and the value of the microinstruction address, and when the two match, the above-mentioned two are Memorize the event of a match, set another arbitrary second value, compare the second value with the microinstruction address, and when the two match, set the above first value and the microinstruction address. erases the memory of the match, and further erases the memory of any third match.
The flow of a complex microprogram can be controlled by setting the value of the third value, comparing the third value with the microinstruction address, and stopping the execution of the microprogram only if there is a memory that the two match. The execution of the microprogram can be stopped when the target microinstruction address is accessed via a specific path.

For this reason, conventionally, when a microprogram passes through a certain path and reaches the target point KEa, in order to stop program execution, K must repeat the operations of setting a stop address and restarting microprogram execution several times. However, the effect is that you can achieve the same functionality as before with a single setting. Moreover, even if you stop the execution of the microprogram many times and stop the microprogram at the desired point, the phenomenon that is asynchronous to the operation of the microprogram may change compared to when it is running normally. do not have. Therefore, there is an effect that the microprogram can be easily debugged.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a microprogram control device according to the present invention. FIG. 2 is an explanatory diagram for explaining the present invention in detail. FIG. 3 is an explanatory diagram for explaining conventional functions. 1... Micro program control circuit 2... Control memory 3... Micro instruction register 4... Micro instruction address register 5... Comparison address register for passing check 6... Comparison address register for passing check reset NutaT... Comparison address regimen for program stop 8-10
... Address comparison circuit 11 ... Flip-flops 12 to 14 ... AND gate 15.16, 1γ, 18, 19, 20, 21° 22.2
3, 24, 25.2B, 27.2B. 29.30, 31.32...Signal line patent applicant NEC Corporation representative Patent attorney Jusai Inoro 2 Figure 23

Claims (1)

[Claims] a setting means for individually setting arbitrary first to third values; comparing the first value and a microinstruction address; and storing a first matching event when the two match; storage means for comparing the second value and the microinstruction address and erasing the first matching event when the two match; and a stop means for stopping the execution of the microprogram only when the first matching event remains when the instruction address and the instruction address match. Microprogram controller.