JPS60262244A - Data processor - Google Patents

Abstract

PURPOSE:To improve the processing efficiency with alteration in a microprogram alteration system using an instruction, by providing a branch flag to each entry of a data table. CONSTITUTION:A branch flag is provided to each entry of a data table storing the alteration contents of a microprogram. If no branch flag is set, both the alteration data and a microaddress are used. While a data address is used when the branch flag is set. When an alteration instruction of the microprogram is delivered, each entry is read out. Then the microprogram is changed by the alteration data on the entry and the microaddress as long as no branch flag is set. While the designated address on the data table is replaced with the data address of the entry in case the branch flag is set.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data processing device controlled by a microprogram, and more particularly to a method for changing a microprogram using instructions.

[Prior art]

In a data processing device controlled by a microprogram stored in a control memory, etc., due to various needs such as responding to the occurrence of pseudo-failures and changes in the device configuration, data processing devices that are controlled by microprograms stored in a control memory etc. It may be necessary to make extensive changes to the microprogram.

Generally, in response to such a need, a microprogram change instruction is set to instruct the change of the contents of the microprogram.

Conventionally, in this type of data processing device, a microprogram change instruction has a microaddress indicating a storage location in a control memory or the like of a microprogram that requires a change process, and change data indicating the details of the change in the microprogram. and by executing one microprogram modification instruction.

1 step is still 1 block of microprogera, :1
・1" It is possible to change the program. Therefore, when changing a microprogram, it is best to execute such microprogram change instructions in combination to achieve the desired microprogram change processing. .

[Problem that the invention seeks to solve]

Therefore, when modifying scattered parts of a microprogram, it is necessary to write a large number of modification instructions, resulting in a disadvantage that the modification process becomes extremely complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a data processing device that performs efficient microprogram change processing.

Another object of the present invention is to provide a data processing device having a microprogram change instruction whose contents can be easily changed.

[Failure to solve the problem]

The present invention relates to a data processing device controlled by a microprogram stored in a storage unit.

A microprogram change instruction that instructs the change of the microprogram, and a data table that is referenced by the microprogram change instruction and stores the changed contents of the microprogram are set, and each entry of the data table has a branch flag. If the branch flag is not set, the entry is composed of change data indicating the changed content of the microprogram and a microaddress indicating the storage location of the change data in the storage unit, and the branch flag is set. If set, the en) l) consists of a data address indicating the location of another data table when the microprogram change instruction is issued.

A means for reading each entry of the data table specified by the microprogram change instruction, and a branch flag of the entry read by the reading means, and if the branch flag is not set, the branch flag of the entry is read. means for changing the microprogram stored in the storage unit according to the change data and the microaddress; and, when the branch flag is set, changing the data table specified by the microprogram change instruction. and means for replacing the address with the data address of the entry.

〔Example〕

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

FIG. 1 shows the configuration of an embodiment of a data processing device to which the present invention is applied. In FIG. 1, 10 is a processing device;
20 indicates main memory. The main memory 20 is a memory that stores programs and data.

The processing device 10 sequentially reads and executes programs stored in the main memory 20. Further, 11 is a control memory that stores microprograms, and 12 is an arithmetic circuit that sequentially reads and executes programs stored in the main memory 20. Arithmetic circuit 12 is controlled by a microprogram stored in control memory 11. Furthermore, 13 indicates a control memory update circuit, which has a function of updating the contents of the microprogram stored in the control memory 11 in response to a microprogram change instruction.

FIGS. 2(a) and 2(b) show the structure of the microprogram change command and data table used in this embodiment.

In FIG. 2(,), 30 indicates a microprogram change instruction, and the instruction code 31. It consists of a data table address 32. In FIG. 2(b), the data table 40 is composed of one or more entries, and each entry contains control data 41 including a branch flag.
．． 8-byte data consisting of a micro address 42 and change data or data address 43 is stored.

In each entry configuring the data table 40, 4
When the micro address is stored in 2 and the change data is stored in 43, the branch flag included in the control data 41 is set to II O71, and when the data address is stored in 43, it is set to 1''. , the branch flag is 0'', the area of micro address 42 has no meaning. In addition, the final entry in the data table 40 (IJ) has an end flag in the control data 41 that indicates that it is the final entry.
is set to

Note that in the second embodiment, the data table 40 is stored in the main memory 20.

Next, details of the processing device 10 are shown in FIG.

In FIG. 3, 11, 1.2, and 1.3 have the same structure as in FIG. 1, signal lines], 5-1.
.

1, 5-2, and 15-3 correspond to the signal line 15 in FIG. 1, and signal lines 14-1 and 1.4-2 correspond to the signal line 14 in FIG. 1, respectively. 13-1 is a memory address register, in which the data table address 32 given by the microprogram change instruction 3° is set by the arithmetic circuit 12 via the signal line 15-3, and the data table 4 stored in the main memory 20 is set. Used to access ゜. Note that the memory address register 13-1 has a counter function that adds up the length of each entry (8 bytes) in order to sequentially access each entry of the data table 4°.

13-2, 1.3-3, and 13-4 are data registers, which store one end of the data table 4o specified by the memory address register 13-1 in the main memory 20.
Read and store. Data register 13-2.1
3-3 and 13-4 respectively.

Data table 400 control data 41. Micro address 7+2. This corresponds to the change data 43.

(-, data register 13-3 is signal line 14.-2
as the write address via the data register]
3-/I respectively provide update information to the control memory 11 as write data via the signal line 14-1. Furthermore, when a data address is stored in the data register/star 13-4, the data address is transmitted via the signal line 1.43.
The address of the data table set in the memory address register 13-1 and accessed secondarily is updated.

In order to avoid complexity, descriptions of circuits not directly related to the present invention are omitted in FIG. 3 for the sake of simplicity.

Figure 4 shows the detailed operation of each part when the microprogram change instruction is executed in Figure 3.As is clear from the figure, the instruction is changed depending on whether the read instruction is a change instruction or not. Processing operations or normal instruction processing operations are performed.

〔Effect of the invention〕

By configuring the present invention as described above, it is possible to easily execute a microprogram change process using a microprogram change instruction, and to realize an efficient microprogram change instruction.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIG.
) and (b) respectively show the structure of the microprogram change command and data table in the embodiment of FIG. FIG. 3 shows a partial configuration of the embodiment shown in FIG. Moreover, FIG. 4 shows the operational flow in this embodiment. In the figure, 10 is a processing device, and 11 is a control memory.

Claims (1)

[Claims] 1. In a data processing device controlled by a microprogram stored in a storage unit, a microprogram change instruction for instructing a change in the microprogram, and referenced by the microprogram change instruction to store the changed contents of the microprogram. each entry in the data table has a branch flag, and if the branch flag is not set, the entry includes change data indicating the changes in the microprogram and the changes in the change data. The entry is composed of a microaddress indicating a storage location in the storage unit, and when the branch flag is set, the entry is composed of a data address indicating the location of another data table, and the microprogram change instruction is issued. means for reading each entry of the data table specified by the microprogram change instruction when
The reading means refers to the branch flag of the read entry, and if the branch flag is not set, reads the changed data of the entry and the micro address stored in the storage unit. It is characterized by comprising means for changing the program, and means for replacing the address of the data table specified by the microprogram change instruction with the data address of the entry when the branch flag is set. data processing equipment.