JPS607295B2 - data processing equipment - Google Patents

Description

[Detailed Description of the Invention] In a microprogram controlled electronic computer equipped with two banks of control storage devices for storing microprograms, when a certain condition is met, a microprogram for interrupt processing/instruction execution preparation is executed by a microprogram for executing instructions. It relates to a data processing device that passes control to a program.

A block diagram around the control storage device and a microprogram flow of a microprogram control electronic computer equipped with two banks of control storage devices for storing microprograms are shown in FIGS. 1 and 2, respectively.

In FIG. 1, an address register 101 stores the address of the next microinstruction to be executed.
, 102 is a control storage device CS that stores a microprogram, and 103 is a function for selecting one word from the two microinstruction words on the CSIOI side and the CSI02 side read from the address indicated by the address register 00. 104 is a register 104 that holds one word selected by the selector 103 and is used for executing a microinstruction.
05 is a test matrix that controls the test branch function of the microinstruction, and various controlled internal states are sent from other devices. Reference numeral 106 denotes a control device that provides the selector 103 with information on whether the test condition checked by the test matrix 105 is satisfied or not as selection information for one word of the microinstruction.

Execution of a microinstruction is performed by sending a control signal from the register 104 to each controlled logic, and during the execution of the current microinstruction, the address of the next microinstruction to be executed is sent to the address register 100, and the address of the next microinstruction to be executed is sent to the address register 100. By sending the test conditions for determining the microinstruction to be executed to the test matrix 105, the next microinstruction to be executed is prepared in parallel with the execution of the current microinstruction. In Figure 2, 200 to 400 each mean one microinstruction word, and if the test branch is taken at 200 (300), the test branch goes to 202 (302), and if it is not taken, the test branch goes to 202 (302).
1 (301), and an unconditional branch from 202 (302) to entry 400 of a microinstruction that executes a specific operation. As shown in Figure 2, if the test branch is taken at 200 and 300, even if you try to immediately branch to 400 and execute a series of microprogram operations, if the test branch is not taken, 201 and 301 (2
Since 01 and 301 require processing of different microinstructions, 202 and 302 (which are paired with 201 and 301)
202 and 302 (the same microinstruction) cannot be branched to 400 unless it is executed.

In this way, in the two-bank control method of the subordinate technology, when a test branch is established, a specific address (second
If there are many requests to execute a series of microprogram operations starting from 4001 in the diagram (2 in Figure 2),
00, 30), it is not possible to branch to a specific address until one microinstruction word (corresponding to 202, 302 in Figure 2) is executed when the test branch is successful, so it is necessary to increase the capacity of the control storage device. invited. An object of the present invention is to provide a data processing device that makes effective use of a control storage device.

This invention relates to a microprogram control data processing device having two banks of control storage devices, in which a microinstruction in one bank is selected based on the test result of the current microinstruction, and only when a branch is taken (or not taken). If you want to immediately execute a series of microprogram operations starting from a specific address, set a special specification to the current microinstruction, and when a branch is taken (or not taken), execution of the next microinstruction is suppressed, and By forcibly branching, the microinstruction at the address scheduled to be executed when the branch is taken can be used for other purposes, and the control storage device can be used effectively. A block diagram around the control storage device and a microprogram flow of a two-bank control microprogram system having a special designation function are shown in FIGS. 3 and 4, respectively.

In FIG. 3, the meanings of 100 to I06 are exactly the same as in FIG. 107 When the special designation signal of the microinstruction sent from the register 104 and the test branch established (or not established) signal sent from the control device 106 are ANDed, the signal is sent to the register 104 by the selector 103 and is scheduled for next execution. prevents the execution of microinstructions that were
This is a control device for a special designation function that generates a specific address and sends it to address register 00.

If there is no special specification in the microinstruction in the register 104 or if the test branch result sent from the control device 106 is not established (or established), the control device 107 performs no function and the execution of the microinstruction is as shown in FIG. It is done in the same way as described. In Figure 4, the meaning of 200 to 400 is the second
It is exactly the same as the figure. However, since the micro instructions 200 and 300 have special specifications, the execution of the micro instructions 202 and 302 explained in FIG. 2 is suppressed.
Apparently, it immediately branches to 400, and 202 and 302 can be used for other purposes. According to this invention, as shown in FIGS. 2 and 4, by providing a special designation function, it becomes possible to supply the devices 202 and 302 for other uses.
Generally, the more microinstructions that are desired to be immediately branched to microinstructions at a specific address when a test branch is taken (or not taken), the more effective the special designation function becomes.

[Brief explanation of the drawing]

Fig. 1 is a peripheral block diagram of a 2-bank control storage device, Fig. 2 is a 2-bank control microprogram flow, Fig. 3 is a block diagram showing an embodiment of the present invention, and Fig. 4 is a block diagram of the 2-bank control memory device. This is a two-bank control microprogram flow. 100: address register, 101, 102: control storage device, 103: selector, 104 three microinstruction registers, 105: test matrix, 106: selector control device, 107: special designated function control device. 2 illustrations, 3 illustrations, 4 illustrations

Claims (1)

[Claims] 1 A method in which two banks of control memory devices are prepared to store microprograms, two addresses are simultaneously read as the next microinstruction, and one of the microinstructions is selected depending on the operation result of the current microinstruction. In, only after the branch is taken (or not taken),
When it is necessary to perform a series of microprogram operations starting from a specific address, a special specification is provided for the current microinstruction, and when a branch is taken (or not taken), the execution of the next microinstruction that has already been read is executed. 1. A data processing device characterized by inhibiting and forcibly branching to a specific address.