JPH04256023A - Microinstruction executing system - Google Patents

Abstract

PURPOSE:To shorten microinstruction word length, and to effectively utilize a control memory by deleting the unused function part of a horizontal microinstruction. CONSTITUTION:A microinstruction 4 is constituted by combining plural groups of a microcommand 9 and a field control information 5 to designate a microcommand field 8 to store the microcommand 9. Then, a microcommand field control part 3 sets the microinstruction 4 to the fields 11, 12,...1n in a microinstruction register 2 in conformity to the field control information 5 read out from the control memory 1, and when it finishes setting to all the corresponding fields 11, 12,...1n, subsequently, it instructs the microinstruction register 2 to execute the microinstruction 4 finished with setting.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microinstruction execution system, and more particularly to a microinstruction execution system that copes with the variable length of horizontal microinstructions in an information processing device.

0002

[Prior Art] Conventional microinstruction execution methods include:
There is a method in which horizontal microinstructions having a fixed bit width are sequentially retrieved from control memory and executed. This horizontal fixed-length microinstruction is divided into multiple microcommand fields, each microcommand field controls a different function, and if there is a function that is not used in one microinstruction, the corresponding microcommand field is It is used as a command.

0003

[Problem to be Solved by the Invention] In the conventional microinstruction execution method described above, the length of one microinstruction word is a fixed bit width, so even if there is a function that is not used, it is necessary to respond to an unused microcommand field. There is a problem in that a control memory corresponding to the bit length of the NOP microcommand is used.

An object of the present invention is to provide a microinstruction execution method that can shorten the microinstruction word length by deleting unused functional parts of horizontal microinstructions, and can make effective use of control memory.

[0005]

[Means for Solving the Problems] The microinstruction execution method of the present invention is a microinstruction execution method for an information processing device that sequentially fetches and executes horizontal microinstructions. a control memory that stores a plurality of microinstructions formed by combining a plurality of sets of specified field control information; a microinstruction register for storing the microinstructions; and a control memory that simultaneously reads out the field control information read out from the control memory. a microcommand field control unit that sets a microinstruction including a microcommand set in the microinstruction register in a field in the microinstruction register, and when all the corresponding fields have been set, instructs the microinstruction register to execute the microinstruction that has been set; The configuration includes the following.

[0006]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

A control memory 1 that stores a plurality of microinstructions 4 has a microinstruction register 2 that stores the microinstructions 4 for execution, and sets field control information 5 read from the control memory 1 in an internal control register 6. death,
According to the field pointer 7 generated by the control register 6, the microinstruction 4 containing the microcommand is set in the fields 11, 12, ... 1n in the microinstruction register 2, and all the corresponding fields 11, 12, ... 1 are set.
When the setting to n is completed, it is connected to the microcommand field control unit 3 which instructs the microinstruction register 2 to execute the microinstruction 4 for which the setting has been completed.

FIG. 2 is an explanatory diagram illustrating the structure of a microinstruction.

The microinstruction 4 is composed of a plurality of microcommand fields 8, and the microcommand field 8 contains the field control information 5 and the microcommand 9.
It is composed of.

FIG. 3 is an explanatory diagram illustrating the structure of field control information.

The field control information 5 includes each field 11, 12, . . . 1n in the microinstruction register 2.
Each bit corresponds to one bit. If a corresponding microcommand exists in a certain field in the microinstruction, the corresponding 1 bit in the field control information 5 takes a logical value of "1" and indicates the field in which to store the microcommand.

Next, the microinstruction setting operation will be explained mainly using FIG. 1.

[0014] The microcommand field control section 3
The field control information 5 read from the control memory 1 is set in an internal control register 6, and a field with a logic value "1" in the field control information 5 is generated as a field pointer 7. The microinstruction register 2 stores microinstructions 4 including microcommands read simultaneously in designated fields 11, 12, . . . 1n. The microcommand field control unit 3 sets one bit in the control register 6 corresponding to the fields 11, 12, . field is generated as field pointer 7. The microinstruction register 2 stores microinstructions 4 including microcommands read simultaneously in designated fields 11, 12, . . . 1n. The microcommand field control unit 3 controls fields 11, 12, . . . 1 in which microcommands have been stored.
1 bit in the control register 6 corresponding to n is set to logical value “0”
” and repeats the reading of the microinstructions 4 including the microcommands until all the fields with the logical value “1” in the control register 6 become the logical value “0”. After confirming the completion of the read/storage operation of the microinstruction 4 including do.

As described above, the microinstruction execution method of the present invention can delete microcommands corresponding to unused functions and execute variable length horizontal microinstructions.

[0016]

As explained above, the present invention configures a microinstruction by combining a plurality of sets of a microcommand and field control information specifying a microcommand field in which the microcommand is stored, and The control unit sets the microinstruction in the field in the microinstruction register according to the field control information read from the control memory, and when the setting in all applicable fields is completed, the microinstruction that has been set in the microinstruction register continues. By instructing the execution of an instruction, the unused functional portion of the horizontal microinstruction can be deleted, the microinstruction word length can be shortened, and the control memory can be used effectively.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating the configuration of a microinstruction.

FIG. 3 is an explanatory diagram illustrating the structure of field control information.

[Explanation of symbols]

1 Control memory 2 Micro-instruction register 3 Micro-command field control section 4
Microinstruction 5 Field control information 6 Control register 7 Field pointer 8 Microcommand field 9 Microcommand

Claims (1)

[Claims] Claim 1: In a microinstruction execution method for an information processing device that sequentially fetches and executes horizontal microinstructions,
a control memory for storing a plurality of microinstructions formed by combining a plurality of sets of microcommands and field control information specifying microcommand fields in which the microcommands are stored; and a microinstruction register for storing the microinstructions. , set microinstructions including the simultaneously read microcommands in fields in the microinstruction register according to the field control information read out from the control memory, and finish setting in the microinstruction register when all the corresponding fields have been set. 1. A microinstruction execution method, comprising: a microcommand field control unit that instructs execution of a microinstruction that is executed.