JPS6248865B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microprogram control device having a control storage and a microprogram storage storing modularized microprograms.

Generally, this type of microprogram control device sequentially stores microprograms in a microprogram storage in a module unit in a fixed area of the control storage section, and executes control using the microprograms in the microprogram storage.

Conventionally, when debugging a microprogram or investigating a failure in the above-mentioned microprogram control device, the address comparison function of the maintenance panel provided in the microprogram control device was used to check the passing address of the microinstruction or to check the address. Information may be collected by stopping the clock due to a comparison match. In this case, once a module-based microprogram in the microprogram storage is stored in a fixed area of the control storage section, each microinstruction that makes up the microprogram is read out according to the address assigned to this fixed area. It can be done. Therefore, it is not possible to detect which module in the microprogram storage the microprogram belongs to simply by comparing the addresses in the fixed areas of the control storage section.

SUMMARY OF THE INVENTION An object of the present invention is to provide a microprogram control device that can uniquely specify the execution addresses of all microinstructions after a module-by-module microprogram in a microprogram storage is stored in a control storage unit.

Another object of the present invention is to provide a microprogram control device that can effectively debug a microprogram and detect failures.

The microprogram control device of the present invention includes an address entry switch capable of specifying an arbitrary address of a microinstruction in a control storage unit, a current address register indicating the address of the microinstruction to be executed, and a current address register that indicates the address of the microinstruction to be executed. A comparison circuit that compares the contents of the address register, a module number switch that can specify any module number in the microprogram storage, and a module number that sets the module number of the microprogram stored in the control storage section from the microprogram storage. a module number register to be stored; a comparison circuit that compares the contents of the module number switch with the contents of the module number register; a decoder circuit that decodes an address of a control storage section in which a modularized microprogram is stored; a selection circuit that selects an address comparison condition based on an output signal of the circuit; an address stop switch that instructs to stop the clock when a microinstruction designated by the address entry switch and the module number switch is executed; and an address stop switch that instructs to stop the clock. It consists of a clock control circuit that controls the clock.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a functional block diagram of a microprogram control device to which the present invention is applied. A microprogram storage 1 that stores various modularized microprograms, a general-purpose register group 2 used by the microprograms for various purposes, an arithmetic circuit unit 3 that executes logical operations and arithmetic operations, and a temporary microprogram storage A control storage unit 4 having a fixed area in which the microprograms of the storage 1 are stored, a current address register 5 that specifies the address of the microinstruction to be executed, and a data address register 6 that specifies the address at which data or control information is stored or read. , a maintenance panel 7 that performs logical operation control, and a control circuit section 8 that controls the execution of microinstructions read from the control storage section 4.

In this microprogram control device, simple instructions issued by the CPU and microprograms that control the execution of basic operations reside in the control storage unit 4, but when executing complex instructions, A plurality of modules required for instruction execution are sequentially stored in a fixed area in the control storage unit 4 from the microprogram storage 1 module by module, and by executing each microinstruction of the stored microprogram, the CPU Execute commands.

Referring to FIG. 2, the correspondence between the microprograms in the control storage and the microprograms in the microprogram storage is shown. Here, the control storage section existing as hardware is represented by 4, the area where modules are stored from the microprogram storage is represented by 12, the entire microprogram stored in microprogram storage 1 is represented by 13, and the microprogram 1 module is represented by 14. show.

Assume that modules in the microprogram storage are used in the order of 1, 2, and N to execute instructions from the CPU. For example, module N
When debugging a routine within a module or investigating a failure, it is necessary to collect information by using the conventional address comparison function of the maintenance panel to confirm the passing address of the microinstruction or by stopping the clock when an address comparison matches. 1, 2, and N display the same address after being stored in the fixed area of the control storage section. Therefore, as described above, the conventional device has the disadvantage that the address comparison function from the maintenance panel cannot be used effectively.

FIG. 3 is a block diagram showing the configuration of one embodiment of the present invention. As shown in the figure, a microprogram control device according to an embodiment of the present invention has an address entry switch 2 on a maintenance panel that can specify an arbitrary address of a microinstruction in a control storage section.
1, a current address register 23 that indicates the address of a microinstruction to be executed, and a first comparison circuit 24 that compares the contents of the address entry switch 21 and the current address register 23. Furthermore, there is a module number switch 22 that can specify any module number in the microprogram storage on the maintenance panel, a module number register 25 that sets the module number of the microprogram stored in the control storage section from the microprogram storage. A second comparison circuit 26 is provided to compare the contents of the module number switch 22 and the contents of the module number register 25. The address of the fixed area of the control storage section in which the modularized microprogram is stored is decoded by the decoder circuit 27 and then
The selection circuit 28 selects the address comparison condition based on the output signal of the decoder circuit 27 in a format to be described later. When the microinstruction specified by the address entry switch 21 and module number switch 22 is executed, the address stop switch 29 on the maintenance panel starts the clock control circuit 3.
0 is instructed to stop the clock, and in accordance with this instruction, the clock control circuit 30 controls the clock stop.

To explain the operation of the above-mentioned microprogram control device more specifically, when the resident microprogram in the control storage section is operating, the decoder circuit 27 sends out a logic 0 output, so the signal line 31 is The first comparison circuit 24 compares the contents of the address entry switch 21 on the maintenance panel with all address bits of the current address register 23, and if they match, the signal line 32 becomes valid and the clock control circuit 30 A logic 1 is input.

When storing a module from the microprogram storage into a fixed area of the control storage unit, the resident microprogram stores the module number of the microprogram to be called in the module number register 25.
Set it to . In this state, when the resident microprogram is executed and the current address register 23 indicates the fixed area of the control storage section storing the called module, the output signal 33 of the decoder circuit 27 becomes logic 1 and the module number switch 22 and When the contents of the module number registers 25 match, the signal line 34 from the second comparison circuit 26 becomes valid. Subsequently, when the outputs of the address comparison signals in the fixed area match, the signal line 35 from the first comparison circuit 24 becomes valid, the AND condition is satisfied, the signal line 36 becomes valid, and the clock control circuit 30 receives a logic 1. is input. Therefore, if the address stop switch 29 is enabled, the clock control circuit 30 will switch the signal line 36
It is possible to stop the clock once it becomes valid.

Even if the modules in the microprogram storage are stored in a fixed area in the control storage unit, the modules can be distinguished by the module number register 25, and the microprograms constituting the microprogram in the microprogram storage can be distinguished by the module number register 25. Execution addresses of all microinstructions, including instructions, can be specified.

As explained above, the present invention can effectively check the microinstruction execution address and stop the clock even for microinstructions given from the microprogram storage by using the address comparison function of the maintenance panel. This has the effect of facilitating debugging of microprograms and investigation of failures.

[Brief explanation of the drawing]

Fig. 1 is a general functional block diagram of a microprogram control device to which the present invention is applied, Fig. 2 is a diagram showing the correspondence between the microprogram in the control storage unit and the microprogram in the microprogram storage, and Fig. 3 is a diagram showing the correspondence between the microprogram in the control storage unit and the microprogram in the microprogram storage. FIG. 1 is a block diagram showing one embodiment of the invention. Explanation of symbols: 1 is microprogram storage;
2 is a general-purpose register, 3 is an arithmetic circuit section, 4 is a control storage section, 5 is a current address register, 6 is a data address register, 7 is a maintenance panel, 8 is a control circuit section, and 12 is stored in units of modules from a microprogram storage. 13 is the entire microprogram stored in the microprogram storage, 14 is the microprogram 1 module, 21 is the address entry switch, 22 is the module number switch, 23 is the current address register, and 24 is the first comparison circuit. , 25 is a module number register, 26 is a second comparison circuit, 2
7 represents a decoder circuit, 28 a selection circuit, 29 an address stop switch, and 30 a clock control circuit.

Claims (1)

[Claims] 1. A microprogram storage that stores modularized microprograms made up of microinstructions, and a fixed area in which microinstructions are stored and in which microprograms in the microprogram storage can be written and read in units of modules. In the microprogram control device, the microprogram control device has a control storage section including a control storage section, and stores microprograms from the microprogram storage in module units in a fixed area of the control storage section and executes control. an address entry switch capable of specifying an address of an instruction; a current address register indicating an address of a microinstruction to be executed; a first comparison circuit that compares the contents of the address entry switch with the contents of the current address register; A module number switch that can specify each module number in the microprogram storage; a module number register that sets the module number of the microprogram stored in the control storage section from the microprogram storage; a second comparison circuit that compares the contents of the module number register with the contents of the module number register; a decoder circuit that is coupled to the current address register and decodes an address of a control storage section in which a modularized microprogram is stored; a selection circuit which is coupled to the first and second comparison circuits and the decoder circuit and selects an address comparison condition based on the output signal of the decoder circuit; and a microinstruction designated by the address entry switch and the module number switch is executed. In this case, a microprogram control device comprising an address stop switch that instructs to stop the clock, and a clock control circuit that performs clock stop control according to the output from the selection circuit and the instruction from the address stop switch. .