JPS61131125A - Information processing unit - Google Patents

Abstract

PURPOSE:To set plural intermittent points and to restart the procedure without disturbing the operation by storing a play flag for intermission into a control storage device and using the said play flag to control permission/release of intermission inhibition. CONSTITUTION:A microinstruction is read from a control storage device 2 according to a signal from an address register 1 at first and a corresponding play flag 3 is read at the same time. In case of the intermission permitted, the flag 3 is fetched to an FF 6 through an AND gate 5. When the flag 3 is logical 1, outputs 8, 9 of the FF 6 as true. The signal 9 of them is a clock inhibition signal to stop the operation by inhibiting the clock. In case of the intermission inhibited, the gate 5 inhibits the output of the flag 3. Then a service processor B executes the read of an internal register of an information processor A by using the signal 8 to output a processing restart signal 7. Thus, the FF 6 is cleared and to make the signal 9 false thereby restarting the operation of the device A.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an information processing device using a microprogram control method.

[Technical background of the invention]

In conventional microprogram control type information processing devices, if you want to interrupt the operation of a microprogram in the middle of its execution, you can either stop the microprogram by a microprogram address match, or write the microprogram to a rewritable control memory (WO2). In the previous version, the program was interrupted by rewriting one step of the program to be interrupted into an unconditional branch microinstruction.

[Problems with background technology]

The disadvantage of the above-mentioned microprogram address match is that it is only possible to interrupt a single address, while the method of rewriting the microinstruction has the disadvantage that the next time the program is restarted, it cannot be restarted correctly because the contents of the program have changed. was there.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above and to make it possible to set a plurality of points at which a microprogram can be interrupted without affecting the operation of the microprogram.

[Summary of the invention]

The present invention stores a flag bit string (hereinafter referred to as break flag) for interrupting the microprogram in the control memory where the microprogram is stored, and reads the break flag at the same time as reading the microprogram.
This purpose is achieved by controlling permission/cancellation of prohibition of microprogram interruption using this break flag.

C Embodiment of the Invention] FIG. 1 shows an embodiment of the invention, in which A is a microprogram control type information processing device and B is a service processor. In addition, (1) is the address register of the microprogram, (2) is the control memory where the microprogram is stored, and (3) is the flag bit string (break bit string) for interrupting the microprogram stored in the control memory (2). flag), (4) is a status register that controls permission/cancellation of interrupt prohibition, (5) is an AND gate that prohibits interrupt, (6) is a flip-flop (F/F) that controls microprogram interrupt, (7) is the clear signal of the flip-flop (6) for canceling the interruption;
(8) is an interrupt signal to the service processor (B), (9
) is a clock prohibition signal of information processing device A.

Next, the operation shown in FIG. 1 will be explained. First, microinstructions of the microprogram are read from the control memory (2) according to the address register (1). At the same time, a flag bit (3) for interrupting the microprogram (break flag) corresponding to the microinstruction is also read from the control memory (2).

To disable/enable interrupts, use the externally rewriteable status register (4) (1 of the program status word).
There are methods such as assigning 1 degree bit.
1 is stored, but if interruption is prohibited, the output of the break flag is prohibited by the AND gate (5).

In case of permission, the break flag is taken through an AND gate (5) into a two-lip-flop (6).

That is, the flip-flop (6) is set. When the break flag is 711 It, outputs (8) and (9) of flip-flop (6) are true. Among these output signals, signal (9) is a clock prohibition signal, and by prohibiting the clock, the operation is interrupted. Signal (8) is a signal that notifies service processor B that the operation of information processing device A has been interrupted. This signal causes service processor B to read the internal register of information processing device A, etc., and sends a processing restart signal ( 7) is output. The signal (7) from service processor B causes the flip-flop (6) to
The operation of the information processing bag [A is restarted by clearing the clock disable signal (9) and making it false.

Note that the interruption and resumption of operation by the output of the flip-flop (6) is an example of the above operation, and there are also other operations such as processing at a specific address of the microprogram by switching the contents of the address register (1) by the signal (9). Another possible method is to restart the operation from the beginning.

〔Effect of the invention〕

The present invention is as described above, and by providing one bit of break flags for each address in the control memory, it is possible to set a plurality of points at which the operation is interrupted. Furthermore, after interrupting the operation, it is possible to restart the process without disturbing the operation of the microprogram.

Effects such as this can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. l: address register, 2: control memory, 3: break flag, 4: status register. 5; AND gate; 6; flip-flop for interruption control;
7; clear signal; 8; interrupt signal; 9; prohibition signal; A; information processing device; B; service processor.

Claims (1)

[Claims] An information processing device using a microprogram control method,
A break flag indicating whether or not to interrupt operation after execution of the microprogram is contained in a control memory in which the microprogram is stored, and an externally rewritable status register for controlling prohibition/permission of interruption of operation;
means for controlling the output of the break flag based on the output of the status register, and suspending the operation of the microprogram when the means determines that suspension is permitted;
An information processing device comprising means for restarting microprogram operation after performing a certain process.