JPS6143740B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a data processing system in which the names of signals such as scanned out latches and their status values are displayed on a display. This relates to a scan-in method in which when a state value is rewritten using a keyboard or the like, the state value of the corresponding latch is also changed.

Computer systems are known that are equipped with a main body computer and a service processor, in which the service processor can scan out the state of the latches and registers of the main body computer, and also scan in arbitrary values to the latches and registers. . The scanout data retrieved from the main system computer is edited by the service processor, and the signal names of the latches and registers and their status values are displayed in pairs on the display of the service processor.

If it were possible to forcibly set the latches that make up the control circuit of the main computer, or to set an error latch to generate a pseudo failure, it would be effective for testing and diagnosing the control circuit of the host computer.
Conventionally, this was accomplished by clipping the set or reset terminal of the latch on the host computer. However, with this method, it is inconvenient that the mounting position to be set or reset must first be determined and physically clipped. Additionally, as circuits become more integrated into LSI, some latches that cannot be clipped will appear.

The present invention is based on the above considerations, and includes:
In a data processing system having a first data processing device and a second data processing device that can scan in and out of the first data processing device, a scan-in operation in the second data processing device can be easily performed. The purpose is to provide a scan-in method with Therefore, the scan-in method of the present invention provides a data processing system that includes a first data processing device and a second data processing device that has a function of scanning out and scanning in to the latch of the first data processing device. In the system, the second data processing device edits and displays the state of the first data processing device on the screen of its own display device, and the state value of the latch on the screen is changed by the operator. , the changed state value of the latch on the screen and the first
The present invention is characterized in that the state value of the latch of the first data processing device is changed by scan-in so that the state value of the latch of the first data processing device coincides with the state value of the latch of the first data processing device. Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 1 is a diagram showing an overview of a data processing system to which the present invention is applied, FIG. 2 is a diagram showing an overview of a scan-out circuit, FIG. 3 is a diagram showing an overview of a scan-in circuit, and FIG. 4 is a diagram showing a scan screen. Figure 5 is a diagram showing the display format and scan address of file 3, Figure 6 is a diagram showing the latch of the main system device, and Figure 7 is a diagram showing the display format on the screen when scan-in is performed. Diagram explaining changes, No. 8
The figure is a flowchart of the scan-in operation performed by the service processor.

In FIG. 1, 1 is the main system unit, 2 is the interface circuit, 3 is the file, 4 is the memory, 5 is the central processing unit of the service processor, 6 is the display controller, 7 is the display, and 8 is the central processing unit of the service processor.
indicate the respective keyboards.

In Figure 1, the area below the dashed line is the service area.
The service processor includes an interface circuit 2, a file 3, a memory 4, a central processing unit 5, a display controller 6, a display 7, a keyboard, and the like. The service processor has a function of scanning out the state of the latch of the main body system 1 and a function of scanning in an arbitrary value to the latch of the main body system 1. When the scan mode is set, the state of the latch is read from the main system device based on the scan address taken out from the file 3 and taken into the service processor. The captured scanout data is edited by the service processor and displayed on the display 7. The operator looks at the scanout screen on display 7, uses the cursor to point out the scanout data that he wants to correct, and when he changes this scanout data to the desired value, the service processor changes the status value of the corresponding latch to the screen. Change to the modified value above.

FIG. 2 explains the outline of the scan-out circuit, in which 9 is a scan address register, 10-0 to 10-2 are latches, 11 and 1
2 represents a selector, and 13-1 and 13-2 represent LSIs. Note that regarding scan-out, the LSIs 13-1 and 13-2 have similar configurations.

The scan address register 9 specifies a latch, and the upper side of the scan address register 9 indicates an LSI address, and the lower side of the scan address register 9 indicates an address within the LSI. The lower side of the scan address register 9 becomes control information for the selector 11, and the selector 11 selects the latch 10-1 according to this value.
Select one from 0 to 10-2. The upper side of the scan address register 9 becomes control information for the selector 12, and the selector 12
One of the scan-out data read from LSI 13-1 and LSI 13-2 is selected. The scanout data output from selector 12 is sent to the service processor.

FIG. 3 shows an outline of the scan-in circuit. In FIG. 3, 15 and 16 indicate distributors, respectively. Note that regarding scan-in, the LSIs 13-1 and 13-2 have similar configurations. The upper side of the scan address register 9 specifies the LSI, and the lower side specifies the latch within the LSI. The distributor 15 has
The upper side of the scan address register 9 and the scan in set signal are input. When the scan address is set in the scan address register 9 and the scan-in set signal becomes logic "1", the signal on the output line of the distributor 15 determined by the upper side of the scan address register 9 becomes logic "1". becomes. The output of the distributor 15 is sent to the distributor 16 in each LSI as a scan-in set signal.
is input. The input side of the distributor 16 is scan/
Lower side of address register 9 and distributor 15
is connected to the corresponding output line. Now LSI
A scan-in of "1" is sent to the distributor 16 of 13-1.
If a set signal is input, the distributor 16 determined by the lower side of the scan address register 9
The signal on the output line of is set to logic "1". Latch 1
Each of the set terminals 0-0, 10-1, and 10-2 is connected to a corresponding output line of the distributor 16, and is set when the corresponding output line of the distributor 16 becomes logic "1". Note that a similar circuit is provided for scan-in reset.

FIG. 4 is a diagram showing an example of a scan screen.
As mentioned above, the scanout data is displayed on the display 7, and the signal name and its status value are displayed on the display screen.
As shown in FIG. 6, signal names such as LATCH1, LATCH2, etc. are given to each of the plurality of latches 13, and the registers are also given signal names.
The signal name is REGISTER. The scan screen shown in FIG. 4 shows "REGISTER4", but this is displayed in hexadecimal, and the contents of the register are "0100" in binary.

FIG. 5 is a diagram showing the file display format and scan address. The file 3 has a display format area and a scan address area. The display format area is divided into multiple lines, each line corresponding to a line on the display screen. “LATCHi=” (however,
i=1, 2......N), and the N+1st
“REGISTER=” is written in the line. The scan address area is divided into multiple lines, the i-th line is filled with the scan address of LATCHi, and the N+1st to N+4th lines are filled with the scan address of LATCHi.
The scan address is written in bits 0 to 3 of REGISTER. When a scan out is commanded, first the first address in the scan address area is
Scan-out is performed according to the scan address of the row, and the scan-out data and the display format of the first row in the display format area are combined, and when the scan-out data is "0", "LATCH1 = 0". is displayed on the first line of the display screen. Next, scan according to the scan address in the second line of the scan address area.
The scan-out data is synthesized with the display format on the second line of the display format area, and the synthesized data is displayed on the second line of the display screen. Thereafter, scan-out is performed in the same manner.

FIG. 7 is a diagram illustrating changes on the screen when performing scan-in. To scan in the value of REGISTER to "7", operate the keyboard 8 to move the cursor below the display data as shown in Figure 7A, and select "7" from the keyboard 8.
Enter. When you press the ENTER key in this state to start scan-in, the service processor retrieves the scan address of REGISTER bits 0 to 3 from file 3, and
Set the latch of bit 0 of REGISTER to ``0'' with scan-in reset, and set bits 1 to 3 to ``1'' with scan-in set. When the scan-in operation is completed, the service processor again scans out the state of the latch and displays it on the screen. In this example, the value of REGISTER is “7” as shown in Figure 7B.
It is confirmed that scan-in has been performed.

FIG. 8 is a flowchart of the scan-in operation performed by the service processor. The file 3 is managed in pages, and each page is provided with a display format area and a scan address area. FIG. 5 shows one page thereof.
Further, the memory 4 of the service processor stores control information indicating how many pages are being displayed. As previously mentioned, when the ENTER key is pressed after input data has been written to the cursor location on the screen, the service processor reads the cursor location and the input data. Next, it is checked from the control information on the memory 4 how many pages of data are currently being displayed. After finding the relevant page, the scan address is searched depending on where the cursor is located on the background. After determining the scan address, scan-in is performed using the scan address and input data.

As is clear from the above explanation, according to the present invention, scan-in is performed using the scan screen that shows the latch signal name and its status value, so scan-in can be performed more easily than in the conventional method. Effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an overview of a data processing system to which the present invention is applied, FIG. 2 is a diagram showing an overview of a scan-out circuit, FIG. 3 is a diagram showing an overview of a scan-in circuit, and FIG. 4 is a diagram showing a scan screen. Figure 5 is a diagram showing the display format and scan address of file 3, Figure 6 is a diagram showing the latch of the main system device, and Figure 7 is a diagram showing the display format on the screen when scan-in is performed. Diagram explaining changes, No. 8
The figure is a flowchart of the scan-in operation performed by the service processor. DESCRIPTION OF SYMBOLS 1...Main system device, 2...Interface circuit, 3...File, 4...Memory, 5...Central processing unit of service processor, 6...Display controller, 7...Display, 8
...Keyboard, 9...Scanout address register, 10-0 to 10-2...Latch, 11 and 12...Selector, 13-1 and 13-
2...LSI, 15 and 16...distributor.

Claims (1)

[Claims] 1. In a data processing system comprising a first data processing device and a second data processing device having a function of scanning out and scanning in to a latch of the first data processing device, the second data processing The device edits and displays the state of the first data processing device on the screen of its display device, and when the state value of the latch on the screen is changed by the operator, the device changes the latch on the screen. state value and the first
A scan-in method, characterized in that the scan-in is configured to change the state value of the latch of the first data processing device so that the state value of the latch of the first data processing device coincides with the state value of the latch of the first data processing device.