JPH0480846A - Memory diagnostic system - Google Patents

Abstract

PURPOSE:To shorten the time needed for diagnosis of a memory by generalizing and controlling the slave CPUs through a main CPU and diagnosing a memory at the rise time by plural slave CPUs in division and in parallel with each other. CONSTITUTION:A main CPU 11 and the slave CPU 12 and 13 are provided with the ROM 1, 2 and 3 respectively. The CPU 11 checks the largest main memory capacity and decides the portions of diagnostic range of a main memory 15 for each slave CPU to set these portions in a control area. Based on the contents of the control area, the memory 15 is diagnosed by the CPU 11 - 13 in parallel with each other. The CPU 11 prepares an overall diagnostic result of the memory 15 based on the contents of the diagnostic results of both CPU 12 and 13. Thus the diagnosis of the memory 15 is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a memory diagnostic method for a data processing device, particularly when the data processing device has a plurality of central processing units.
The present invention relates to a memory diagnostic method in which a main central processing unit shares memory diagnostic work with a plurality of slave central processing units.

[Conventional technology]

Conventionally, in a memory diagnosis method when starting up this type of data processing apparatus, only one main central processing unit performs memory diagnosis.

[Problem to be solved by the invention]

In the conventional memory diagnosis method described above, one central processing unit performs memory diagnosis when starting up a data processing device, so the memory diagnosis time increases in proportion to the increase in main memory. Therefore, the disadvantage is that it takes a long time to start up.

[Means to solve the problem]

The memory diagnostic method of the present invention is a memory diagnostic method for the main memory in a data processing device which is refined by connecting a main memory and at least two central processing units via a bus, the method comprising: one main central processing unit and at least one central processing unit; each of the two slave central processing units has a read-only memory, the main central processing unit includes first means for checking and registering the number of connected slave central processing units, and checking the capacity of the main memory; a second means for determining a diagnosis range of the main memory capacity in the slave central processing unit registered by the first means;
third means for causing each of the slave central processing units to diagnose the main memory upon receiving information from the second means; and a third means for causing each of the slave central processing units to diagnose the main memory; and and fourth means for receiving and analyzing information in said read-only memory.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a configuration diagram of an embodiment of the present invention, FIG. 2 is an explanatory diagram of the overall control means of the slave central processing unit provided in the main central processing unit 11 of the present embodiment, and FIG. 3(a). (b) is a flowchart explaining the operation procedure in each step group of this embodiment. (The CPU in the figure is a central processing unit.) The embodiment shown in FIG. Sub-central processing units 12 and 13 are connected which share memory diagnosis under the control of the device 11. Main and slave central processing units 11 and 12.
13 are equipped with read-only memories 1 and 2.3, respectively. The read-only memories 1, 2, and 3 each store a program having a group of steps along the flowchart of FIG. 3, which will be described later. The main central processing unit 11 is
Since the slave central processing units 12 and 13 are under general control, the three procedures shown in FIG. 2 are used to perform general control of memory diagnosis. That is, it consists of an area 5n that informs the presence or absence of each slave central processing unit, an area 6n that informs the scope of the main memory diagnosis of each slave central processor, and an area 7n that reports the results of the main memory diagnosis carried out in each slave central processor. There is.

Next, the specific operation of this embodiment is shown in FIG. 3(a).

This will be explained using (b). Step group 1 includes steps 1-
5, and the presence/absence of each slave central processing unit is set in the control area 5n. That is, if NO in step 1, a slave central processing unit capable of memory diagnosis is confirmed and registered with the main central processing unit. Step group 2 is step 6~
10, the main central processing unit checks the maximum main memory capacity, determines the share of the diagnosis range of the main memory of each slave central processing unit, and sets it in the control area 6n. Step group 3 operates according to steps 11 and 12,
Memory diagnosis is carried out in parallel in each slave and main central processing unit according to the contents of the control area 6n. Step group 4 operates according to steps 13 and 14, and the main central processing unit creates an overall memory diagnosis result from the contents of the diagnosis results 7n of each slave central processing unit to complete the memory diagnosis.

〔Effect of the invention〕

As explained above, the present invention allows the main central processing unit to control the slave central processing units, and performs memory diagnosis at startup in parallel among a plurality of slave central processing units.
This has the effect of shortening memory diagnosis time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is an explanatory diagram of this embodiment, and FIGS. 3A and 3B are flowcharts showing the operating procedure of this embodiment. 1.2.3... Read-only memory, 11... Main central processing unit (main CPL;) 12.13... Slave central processing unit (slave CPtJ), 14... Bus, 15... Main memory, 5n, 6n, 7n...areas.

Claims (1)

[Scope of Claims] 1. A memory diagnosis method for the main memory in a data processing device configured by connecting a main memory and at least two central processing units via a bus, comprising: one main central processing unit and at least one central processing unit; each of the two slave central processing units has a read-only memory, the main central processing unit includes first means for checking and registering the number of connected slave central processing units, and checking the capacity of the main memory; a second means for determining a diagnosis range of the main memory capacity in the slave central processing unit registered by the first means;
third means for causing each of the slave central processing units to diagnose the main memory upon receiving information from the second means; and a third means for causing each of the slave central processing units to diagnose the main memory; and and a fourth means for receiving and analyzing information in the read-only memory. 2. At the beginning of each operation procedure of the first means, the second means and the fourth means, the step of confirming whether the central processing unit is the main central processing unit, 2. The memory diagnostic method according to claim 1, wherein when said first to fourth means are stored in a read-only memory, any of the central processing units can serve as the main central processing unit.