JPH07122851B2 - Micro program storage system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A microprogram storage system for miniaturizing and speeding up a control memory for storing a microprogram, in which a control memory for storing a microprogram is made as economical as possible in a microprogram controller. A memory card that stores the required microprograms for the purpose of speeding up,
Electrically erasable programmable read-only memory for storing microprograms extracted from the memory card, writable and readable control memory for storing microprograms extracted from electrically erasable programmable read-only memory, and power-on If the memory card is installed, the microprogram stored in the memory card is extracted and stored in the electrically erasable programmable read-only memory when the memory card is installed. And an initial setting means for extracting the microprogram stored in the electrically erasable programmable read-only memory and storing it in the control memory.

[Industrial application field]

The present invention relates to a microprogram storage system for achieving an economical and high-speed control memory for storing a microprogram in a microprogram control device.

2. Description of the Related Art In recent years, a micro program control device adopting a micro program control system has been widely adopted. Therefore,
In many cases, one type of microprogram controller is shared by a plurality of information processing systems.

In this type of microprogram controller, it is possible to make a control memory that stores a microprogram and sequentially extracts specified microinstructions economical and speed up.
There is a strong demand for improving the economic efficiency and processing capacity of the information processing system.

[Conventional technology]

FIG. 4 is a diagram showing an example of a conventional micro program control device.

In FIG. 4, 1 is a control memory (CM) for storing a micro program (MP), 2 is a sequencer (SEQ) for sequentially transmitting the address a of the micro instruction m extracted from the control memory 1, and 3 is A microinstruction register (CM that stores the microinstruction m extracted from the control memory 1
IR).

When the address a is transmitted from the sequencer 2 to the control memory 1 in a predetermined order, the microinstructions m stored at the corresponding address a in the control memory 1 are sequentially extracted and stored in the microinstruction register 3.

The control memory 1 is composed of a read-only memory and is shared by a plurality of types of information processing systems. Therefore, at the manufacturing stage, a microprogram (MP) required for all target information processing systems. Are stored, and only the required microprogram MP is executed in each information processing system in which the microprogram controller is used.

[Problems to be solved by the invention]

As is clear from the above description, in the conventional micro program control device, in order to share the micro program control device with a plurality of information processing systems, all the micro programs required in each information processing system are stored in the control memory 1. When a program is stored and installed in each information processing system, only a necessary microprogram is executed, other microprograms are not used at all, and the control memory 1 has an unnecessarily large capacity. There was a point.

Further, since the control memory 1 is composed of a read-only memory, there is a problem that the read time of the micro instruction m is significantly increased as compared with a normal write / read memory.

SUMMARY OF THE INVENTION It is an object of the present invention to make a control memory storing a microprogram in a microprogram control device economical and high speed as much as possible.

[Means for solving problems]

 FIG. 1 is a diagram showing the principle of the present invention.

In FIG. 1, reference numeral 1a is a writable / readable control memory, and 2a is a control memory.
Is a sequencer, 4 is a memory card, 6 is an electrically erasable programmable read-only memory, 100 is initialization means, and MP is a microprogram.

[Action]

The memory card 4 stores the required microprogram MP.

The electrically erasable programmable read-only memory 6 is
The micro program MP extracted from the memory card 4 is stored.

The control memory 1a stores the microprogram MP extracted from the electrically erasable programmable read-only memory 6.

When the power is turned on, the initial setting means 100 inspects whether or not the memory card 4 is installed, and when the memory card 4 is installed, extracts the microprogram MP stored in the memory card 4. The program is stored in the electrically erasable programmable read-only memory 6, and then the microprogram MP stored in the electrically erasable programmable read-only memory 6 is extracted and stored in the control memory 1a.

Thereafter, the microinstructions designated by the address transmitted from the sequencer 2a are sequentially extracted from the control memory 1a and executed.

If the memory card 4 stores only the microprograms required by each target information processing system, each control memory stores only the microprograms required by the information processing system. The erasable programmable read-only memory 6 and the control memory 1a can be made economical.

Further, since the control memory is composed of a normal write / read memory, the read time of the micro instruction is shortened as compared with the conventional control memory using the read only memory, and the processing capability of the micro program control device is improved. It will be possible.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing a microprogram controller according to an embodiment of the present invention, and FIG. 3 is a diagram illustrating an initial setting process in FIG. The same reference numerals denote the same objects throughout the drawings.

In FIG. 2, an initial setting section (IPL) 21 is provided in the sequencer (SEQ) 2a as the initial setting means 100 in FIG.

In FIGS. 2 and 3, the memory card (MC) 4 stores only the microprogram (MP) used in the target information processing system, and the memory card (MC) 4 is attached to the connector 5. A short-circuit wire 41 is provided to inspect whether or not is inserted.

When the memory card 4 is not attached to the connector 5, the ground signal e is not transmitted to the sequencer 2a via the signal line 101, but when the memory card (MC) 4 is attached to the connector 5, Ground signal e is short-circuit wire 4 in memory card 4
1, and is transmitted to the sequencer 2a via the signal line 101.

The control memory (CM) 1a is composed of a normal read / write memory. When the microprogram controller is not powered on, a normal microprogram MP is stored in the control memory 1a. Not not.

On the other hand, the microprogram MP stored in the electrically erasable programmable read-only memory (EEPROM) 6
Are retained even when the power is not turned on.

In this state, when the microprogram controller is powered on, the power-on signal Po is input to the sequencer 2a to activate the initial setting unit 21.

The activated initial setting unit 21 receives the ground signal e from the signal line 101.
Is transmitted (step S in FIG. 3).
1).

When it is determined as a result of the inspection that the ground signal e is transmitted from the signal line 101 (step S2), the initial setting unit 21 determines that the memory card 4 is attached to the connector 5, and the signal line The memory card read instruction g is transmitted to 102 to set the gate 7 in the conductive state, and the signal lines 103 and 104 are also provided.
The write signal w ₆ and the address a are transmitted to the electrically erasable programmable read-only memory 6 via the, and each microinstruction m forming the microprogram MP is sequentially extracted from the memory card 4, and the signal line 105, the conduction The data is sequentially stored in the electrically erasable programmable read-only memory 6 via the gate 7 in the state and the signal line 106 (step S3).

When all the micro instructions m are stored, the micro program MP stored in the memory card 4 is copied in the electrically erasable programmable read-only memory 6, and thereafter the memory card 4 is removed from the connector 5. Alternatively, the microprogram MP is retained in the electrically erasable programmable read-only memory 6 even when the power is turned off.

If the ground signal e is not transmitted from the signal line 101 as a result of the inspection in step S1 (step S2), the initial setting unit 21 causes the memory card 4 to connect to the connector 5
It is determined that the microprogram MP is not mounted in the memory card 4, and the microprogram MP is not copied from the memory card 4 to the electrically erasable programmable read-only memory 6.

Next, the initial setting section 21 sends the read signal r to the electrically erasable programmable read-only memory 6 via the signal line 107.
₆ and write signal to control memory 1a via signal line 108
transmitting the w _1, control memory 1a and electrically erasable programmable read-only memory 6 and further via the signal line 104
By transmitting the address a to the signal line 10, each microinstruction m constituting the microprogram MP extracted from the electrically erasable programmable read-only memory 6 is transmitted.
Sequentially store in control memory 1a via 6 (step S
Four).

When all the micro instructions m are stored, the micro program MP stored in the electrically erasable programmable read only memory 6 is copied in the control memory 1a.

With the above, the initialization process of the microprogram in the control memory 1a by the initialization unit 21 is completed.

Thereafter, the sequencer 2a transmits the address a to the control memory 1a as is well known, sequentially extracts the microinstructions m and stores them in the microinstruction register (CMIR) 3, so that the required microprogram MP is executed. Become.

As is apparent from the above description, according to the present embodiment, even when the micro program control device is shared by a plurality of information processing systems, a memory card storing only the micro program MP required for the target information processing system. Four
Attach the connector to the connector 5 and turn on the power.
21 is a microprogram MP extracted from the memory card 4.
Is copied to the electrically erasable programmable read-only memory 6 and held therein, and then copied to the control memory 1a, and thereafter the microprogram is executed based on an instruction from the sequencer 2a.
MP is executed.

Therefore, the control memory 1a stores only the microprogram MP required in the target information processing system, and the storage capacity is also reduced.

Further, since the control memory 1a is composed of a normal write / read memory, the read time of the micro instruction m is also a conventional control memory 1 composed of a read-only memory (FIG. 4).
Since it is significantly shortened in comparison with the above, the processing speed of the micro program control device is also improved, which is effective in improving the processing capacity of the target information processing system.

〔The invention's effect〕

As described above, according to the present invention, each control memory stores only the microprogram necessary for the information processing system, and thus the electrically erasable programmable read-only memory and the control memory have a small capacity and are economical. Will also be possible.

Further, since the control memory is composed of a normal write / read memory, the read time of microinstruction is also shortened as compared with the conventional control memory using a read-only memory, and the processing capability of the microprogram controller is concerned. Can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing a microprogram controller according to an embodiment of the present invention, and FIG.
FIG. 4 is a diagram illustrating the initial setting process in FIG. 2, and FIG. 4 is a diagram showing an example of a conventional microprogram controller. In the figure, 1 and 1a are control memory (CM), 2 and
2a is a sequencer (SEQ), 3 is a micro instruction register (C
MIR), 4 is a memory card (MC), 5 is a connector, 6 is an electrically erasable programmable read only memory (EEPR)
OM), 7 is a gate, 21 is an initial setting unit (IPL), 41 is a short-circuit line, and 101 to 108 are signal lines.

Front page continued (72) Inventor Kazuo Nagahori 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa, within Fujitsu Limited

Claims (1)

[Claims] 1. A memory card (4) for storing a required microprogram (MP), and an electrically erasable programmable read-only memory () for storing the microprogram (MP) extracted from the memory card (4). 6), a writable / readable control memory (1a) for storing the microprogram (MP) extracted from the electrically erasable programmable read-only memory (6), and Whether or not the memory card (4) is installed is inspected, and when the memory card (4) is installed, the microprogram (MP) stored in the memory card (4) is extracted to perform the electrical operation. The memory stored in the erasable programmable read-only memory (6) and then stored in the electrically erasable programmable read-only memory (6). Black program (MP)
A micro-program storage system, comprising: initializing means (100) for extracting and storing the extracted data in the control memory (1a).