JPS61139835A - Microprogram overlay system - Google Patents

Abstract

PURPOSE:To load an overlay part with a small amount of hardware by using a shift path provided for diagnosis to load a microprogram. CONSTITUTION:Contents of an overlay address register 3 are compared in a comparator 4; and if it is judged that overlay is necessary, a new overlay address is set to an overlay register 5, and a holding signal is outputted to stop the data processing. When an overlay request signal comes to a diagnosing part 8, a write pulse control part 81 included in this part 8 loads a required overlay part in an overlay memory 84 to a shift register 82 in accordance with the overlay address signal and uses the shift path to set it to an address register 1 and a write data register 2. A shift path control part 83 repeats this operation to load all of the overlay part to a control storage part 6 and restarts the processing.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a microprogram control device in a data processing device, and more particularly to a microprogram overlay control system.

(Prior Art) Conventionally, in a microprogram control device that employs an overlay control method, when there is a microprogram larger than the capacity of the control memory, the microprogram that protrudes from the control memory is stored in the main memory. During the execution of an instruction, the protruding microprogram accesses the main memory from the microprogram control device when necessary, loads the microprogram into the control memory, and executes it. Such conventional technology includes Japanese Patent Application Laid-Open No. 48-9
No. 1936 1 Information Processing Apparatus I is publicly known.

On the other hand, hardware is required to access the internal main memory of the microprogram control device, and it is necessary to perform overlay control using the microprogram. □For microprograms based on conventional technology using a shift bus, see Japanese Patent Application Laid-Open No. 59-88858.
A No. 1 information processing device 1 is known.

(Problem to be solved by the invention) Inside the microprogram control device described above,
This method has the disadvantage that it requires additional hardware to access the main memory, which increases the amount of hardware. Furthermore, since the overlay control is performed by a microprogram, the number of steps corresponding to the overlay microprogram increases, which has the disadvantage that the capacity of the control memory must be increased.

In particular, if the capacity of the microprogram is slightly larger than the capacity of the control memory, and if a microprogram that is infrequently used protrudes, the
- There was a drawback that increasing the amount of air was very inefficient.

An object of the present invention is to solve the above-mentioned drawbacks by loading a microprogram using a shift bus provided for diagnosis, and to provide a structure that allows loading of an overlay control method with a small amount of hardware. The purpose of this invention is to provide an overlay method for microprograms.

(Means for Solving the Problems) The microprogram overlay method according to the present invention includes a shift hash, a diagnostic section, an overlay load requesting means,
It is configured to include a control memory, an overlay load means, and a restart means.

The shift bus is used to diagnose control by microprograms, the diagnostic section is used to control the shift bus and execute diagnostic processing, and the control memory is used to store the overlay section. belongs to.

The overlay load request means detects the need to use the overlay section of the microprogram, stops the data processing device, and requests the diagnostic section controlling the shift bus to load the overlay section of the microprogram. It is something.

On the other hand, the overlay loading means uses a shift bus to cause the diagnostic unit to load the overlay portion of the microprogram into the control memory.

The restart means is for restarting the data processing device after the diagnostic section has finished loading the overlay section of the microprogram.

(Example) Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment for implementing a microprogram overlay method according to the present invention. In Figure 1, 1 is an address register, 2 is a write data register, 3 is an overlay address register, and 4 is an address register.
is a comparator, 5 is an overlay register, 6 is a control memory, 7
8 is a microprogram register, and 8 is a diagnostic section. In the diagnostic section 8, 81 is a write pulse control section, 82 is a shift register, 83 is a shift bus control section, and 84 is an overlay memory.

In FIG. 1, address register 1 is for holding the address of control memory 6, write data register is for holding write data to control memory 6, and overlay address register 3 is for holding the address of control memory 6. This is for holding an overlay address indicating which part of the overlay microprogram is stored in the overlay portion of memory B. The comparator 4 compares the contents of the overlay address register 3 and the contents of the address register 1, and if the two do not match, the comparator 4 compares the contents of the overlay address register 3 and the contents of the address register 1.
is set, and when the overlay load is completed, a new overlay address is output to the automatic (lay address register 3).A hold signal is output to the signal line 102 to stop the overlay register 5 data processing device, and the diagnostic A signal requesting a layload and a signal representing a new overlay address are output to the shift control unit 83 included in the shift control unit 8. When the overlay load is completed, the signal is sent from the shift control unit 83 via the signal line 103. The control memory 6 is for storing a microprogram, and the microprogram register 7 holds the output of the control memory 6 and is connected to each control unit via a signal line 104. The diagnostic section 8 is for controlling the shift bus (signal line 105) of the data processing device.

On the other hand, the light pulse control section 81 included in the diagnosis section 8
A write pulse for writing write data into the control memory 8 is output at the end of the shift operation, and the shift register 82 is used to store the shift data flowing through the shift bus. When an overlay request signal arrives, the overlay address signal is loaded into the necessary overlay section t shift register 82 in the overlay memory 84, set in the address register 1 and write data register 2 using the shift bus, and shifted. At the end of the operation, a request is sent to the write pulse control unit 81 to output a write pulse. By repeating the above operation, the shift bus control unit 83 sends a hold release signal to the signal line 1 when all the overlay parts have been loaded into the control memory 6.
05. The overlay memory 84 stores a microprogram for an overlay control method.

Next, the operation of this embodiment will be explained.

FIG. 2 is an explanatory diagram showing the relationship between the microprogram and the contents of the control memory 6. Of the 14 bits that form the address of control memory B, the most significant two bits distinguish the resident section and overlay sections 01, 10, 11, respectively, and one of the overlay microprograms Q1, 10, 11 is controlled. Load it into the overlay section of memory B.

FIG. 3 is an explanatory diagram showing the contents of the opalay memory 84. Since the contents of the overlay memory 84 are loaded into the control memory 6 via the shift bus (signal line 105),
The contents of the overlay memory 84 shown in the figure consist of pairs of addresses and corresponding microprograms.
．． 11 are stored.

First, control memory 6 contains overlay microprogram 0.
It is assumed that 1 is stored. At this time, %01N is stored in overlay address register 3.

The most significant two bits of the address are -001 or %0
When 1 l, overlay is not activated, but when the two most significant bits are %10, comparator 4 detects a mismatch between the contents of address register 1 and overlay address register 3, so overlay is necessary. becomes.

Therefore, %10' is set in the overlay register 5, and a hold signal is output to stop the data processing device. At this time, a one-overlay request signal is simultaneously output to the shift bus control section 83 via the signal line 101. Since the value of the overlay address is -10', the shift bus control unit 83 sets the contents of the overlay (pair of address and microprogram) stored at the overlay address -10' of the overlay memory 84 in the shift register 82. do. The shift register 82 shifts the above contents and sets them in the address register 1 and write data register 2. Note that the original value is shifted into the shift register 82, and this value is saved in the shift register 82.

When the shift operation is completed, the write pulse control unit 81 is activated to output a write pulse, and the contents of the control memory 8K write data register 2 are written.

Next, the contents of the next overlay at overlay address %10' are similarly set in the shift register 82 and written in the control memory 6. When the contents of all overlays at lay address %10' are written, the saved original values are set in the shift register 82 to restore the contents of address register 1 and write data register 2 to their original values. Therefore, a hold release signal is output on the signal line 103 to reset the overlay register 5 and release the hold.When the hold is released, %10# is set in the overlay address register 3, and the microprogram register 7 is set to %10#. The most significant two bits of the address are %10.
'The content of the ray is stored at the specified address. In other words, the overlaid microprogram is executed.

If the overlay microprogram is loaded using the shift hash as described above, the overlay section can be easily loaded.

(Effects of the Invention) As described above, the present invention has a configuration that allows overlay loading using a shift bus for diagnosis, thereby easily implementing an overlay control type microprogram control device while reducing the hardware of the microprogram control device. This has the effect of being able to load programs.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment for implementing a microprogram overlay method according to the present invention. FIG. 2 is an explanatory diagram showing the relationship between the contents of the control memory and the microprogram in FIG. 1. FIG. 8 is an explanatory diagram showing the contents of the overlay memory in FIG. 1. 1...-7 Dress register 2...Write data register 3/e/Overlay address register 4...Comparator 5@-/Overlay register 6/Control memory 7@II/Micro program register 8... Diagnosis section 81... Light pulse control section 82... Shift register 83... Shift bus control m 84... Overlay memory

Claims (1)

[Claims] A shift bus for executing diagnosis of control by a microprogram, a diagnostic unit for controlling the shift bus and executing diagnostic processing, and detecting the necessity of using the overlay unit of the microprogram and processing data. Overlay load request means for stopping the device and requesting a diagnosis section controlling the shift bus to load the overlay section of the microprogram, and a control for loading and storing the overlay section. storage; and overlay loading means for loading an overlay portion of the microprogram into the control storage by the diagnostic unit using the shift bus, after the diagnostic unit has finished loading the overlay portion of the microprogram. ,
1. A microprogram overlay system, comprising restart means for restarting said data processing device.