JPH0467663B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] A system comprising a basic bus and an expansion bus provided with functions equivalent to the basic bus by a system expansion device, and an expansion adapter connected to the expansion bus connected to the expansion bus through the system expansion device. In an expansion system configured to be connected to a basic bus, 1DMA records the history of various signals given specific information specified on the expansion bus from each expansion adapter connected to the expansion bus. A tracer that traces each operation is provided on the expansion bus, and a display means is provided to display the history contents traced by the tracer, so that even if the expansion bus is in an inoperable state (so-called hang-up), the trace contents of the tracer can be displayed. Through analysis, the expansion adapter that caused the failure can be isolated and the high reliability of the expansion system can be ensured.

[Industrial application field]

The present invention provides a status monitoring device for a system expansion device;
In particular, in an expansion system configured to expand the system by having an expansion bus with the same functions as the basic bus through a system expansion device, trace the history of each expansion adapter connected to the expansion bus. The present invention relates to a status monitoring device for a system expansion device that is equipped with a tracer to quickly detect adapter hang-up.

[Conventional technology]

A conventional expansion system that expands the system using a system expansion device was configured as shown in FIG. In other words, code 1 is CPU, 2 is memory,
3 is a system expansion device, 4-1 to 4-k are adapters, 5-1 to 5-k are adapters, 6 is a basic bus, and 7 is an expansion bus.

The system expansion device 3
This is a device for expanding an expansion bus 7 subordinate to the basic bus 6 with the same function as the basic bus 6, and expansion adapters 5-1 to 5-k are connected to the expansion bus 7.
These expansion adapters 5-1 to 5-k are DMA adapters like the adapters 4-1 to 4-k connected to the basic bus 6, and are connected to the basic bus 6 via the system expansion device 3. Ru.

The principle of connection operation will now be explained with reference to FIG.

When a certain adapter on the expansion bus 7, for example, the #k adapter 5-k, performs DMA transfer, the DMA request from the #k adapter 5-k, that is, the expansion bus 7
The bus mastership request signal (BRm) of the expansion bus 7
Send to. Upon receiving BRm, system expansion device 3 sends a bus control request signal (BRn) of basic bus 6 onto basic bus 6 . After that, basic bus 6
to basic bus 6 bus use permission signal (BGn)
When the system expansion device 3 receives this, the system expansion device 3 sends a bus use permission signal (BGm) of the expansion bus 7 to the expansion bus 7. Applicable
When #k adapter 5-k receives BGm, system expansion device 3 sends a bus busy signal BBSY to expansion bus 7 and basic bus 6, respectively. And #k adapter 5-k transfers data (DMA transfer) via system expansion device 3.
Start.

Note that n in BRn and BGn represents the priority on the basic bus 6, and m in BRm and BGm represents the priority on the expansion bus 7.
Represents the highest priority.

The operation of other expansion adapters is exactly the same as described above.

[Problem that the invention seeks to solve]

As mentioned above, in the conventional system expansion device 3, BRm on the expansion bus 7 is used as BR and the basic bus 6 is
BGn on the basic bus 6 is used as BG and sent onto the expansion bus 7, so that the basic bus 6 can only understand one signal each of BR and BG for the system expansion device 3. Ta. In other words, BRm from #2 adapter 5-2 for expansion, and BRm from #k adapter 5-k for expansion.
Even BRm is all BRn from system expansion device 3.
is sent to the basic bus 6, and conversely, BGn from the basic bus 6 is specified for all expansion #2 adapters 5-2 to #k adapters 5-k connected to the expansion bus 7. The data is sent to the system expansion device 3 without any processing.

Therefore, if the expansion bus 7 hangs up,
From the basic bus 6, it can only be determined that the error is in the system expansion device 3, and which expansion device on the expansion bus 7
There was a drawback that the error in the DMA adapter could not be identified.

Therefore, if an error occurs in an expansion adapter, there is a need for a system expansion device status monitoring device that can quickly identify the error-prone adapter.

[Means for solving problems]

FIG. 1 shows a basic configuration diagram of a status monitoring device for a system expansion device according to the present invention, and reference numerals 1 to 7 correspond to those in FIG. Reference numeral 8 represents a tracer, and 9 represents a display means.

The tracer 8 sends a DMA request from each expansion adapter on the expansion bus 7 to the system expansion device 3, that is, a response signal to the request adapter in response to the bus mastership request signal BRm of the expansion bus 7, that is, permission to use the expansion bus 7. The signal BGm is traced every DAM operation, and if the expansion bus 7 hangs up, the tracing is automatically stopped. The above trace function has a function that stores the adapter that is in operation or scheduled to operate at the time of a hang-up and the adapter of the previous DMA for each DMA operation, and when the trace storage function becomes full, Trace information is updated sequentially from the oldest to the latest.

The display means 9 is capable of always reading and displaying the trace information held in the tracer 8, regardless of the state of the expansion bus 7.

[Effect]

The operation in which the expansion adapters 5-2 to 5-k connected to the expansion bus 7 are connected to the basic bus 6 via the system expansion device 3 and DMA transfer is started is the same as that in FIG. Therefore, its explanation will be omitted.

On the other hand, the tracer 8 receives each data on the expansion bus 7,
That is, a DMA request from the expansion adapters 5-2 to 5-k to the system expansion device 3, a response signal from the system expansion device 3 to the adapter for the DMA request, each data of DMA data transfer, etc.
Each DMA operation is traced. Therefore, even if the expansion bus 7 hangs up and its tracing is automatically stopped, the expansion adapters that are operating or scheduled to operate at the time of the hang-up and the
The tracer 8 traces and stores the contents of the DMA operation with the adapter for each DMA operation. By reading and displaying the trace information stored in the tracer 8 on the display means 9, it is possible to identify which expansion adapter is causing the error, and also know the data information on the expansion bus 7 at that time. be able to.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows the configuration of an embodiment of a status monitoring device for a system expansion device according to the present invention.

In FIG. 2, the symbols 1, 3, 5-1, 5-
2, . . . , 5-k, 6, 7 correspond to those in FIG. 3 and FIG. 1, and 8 corresponds to that in FIG. 10 is a comparison circuit, 11 is a system extension section, 1
2 is an interface circuit, 13 is a decoder, 14
15 represents a trace timing circuit, 15 represents a readout circuit, and 16 represents a panel display device.

In addition, in the same figure, #1 adapter 5- for expansion
Although there are two adapters 5-k for each of #1 to #k, they are the same, and are drawn separately for each input in order to make the following operation description easier to understand.

The system expansion device 3 includes a comparison circuit 10, a system expansion section 11, and an interface circuit 12. The comparison circuit 10 is a circuit that prioritizes bus control from the expansion adapters 5-1 to 5-k connected to the expansion bus 7, and the system expansion unit 11 is a circuit that prioritizes bus control from the expansion adapters 5-1 to 5-k connected to the expansion bus 7. DMA adapter 5-1 for extending the usage permission signal BG
to 5-k, and the interface circuit 12 connects the system expansion device 3 and the basic bus 6.
This is a circuit that connects the

The decoder 13 connects expansion DMA adapters 5-1 to 5-k connected to the expansion bus 7.
For example, it is a circuit that converts it into hexadecimal, the tracer 8 is a circuit that traces and holds the trace information of the expansion DMA adapter connected to the basic bus 6 for each DMA operation as explained above, and the panel display device 16 is This device displays the trace information stored in the tracer 8 via the readout circuit 15.

The operation of an expansion adapter that performs DMA transfer is as follows.
It is as follows. That is, a bus mastership request signal for the expansion bus 7 is sent from the expansion adapters 5-1 to 5-k on the expansion bus 7 to the system expansion device 3.
Send BRm. Here, the comparison circuit 10 determines the priority order of bus control, and in making this determination, the signal with the highest priority among each BRm (BRm
The higher the value of m, the higher the priority, and the priority is assigned in advance to the expansion adapters 5-1 to 5-k) is sent to the interface circuit 12 in the system expansion device 3 as a BR. do.
The interface circuit 12 that received the BR,
BRn (n is the priority of the basic bus 6) is sent to the CPU 1 on the basic bus 6.

If CPU1 allows the use of basic bus 6,
A bus use permission signal BGn is sent onto the basic bus 6, and the interface circuit 12 receives the BGn, thereby sending the BG to the system expansion unit 11. The system expansion unit 11 sends an expansion bus 7 use permission signal BGm to the expansion adapter whose bus control request has a high priority, and when the expansion adapter receives the BGm, the system expansion device 3 sends the expansion bus Outputs the bus busy signal BBSY to 6.
As a result, the expansion adapter starts DMA transfer. At this time, the system expansion device 3 also outputs the busy signal BBSY to the basic bus 6. The above operations are as explained in FIG. 1.

On the other hand, regarding expansion bus 7,
The decoder 13 converts BRm into a hexadecimal number and sends it to the tracer 8. The tracer 8 is the BBSY sent out by each expansion adapter 5-1 to 5-k.
The data from the decoder 13 is stored as trace information at the timing of BBSY, that is, the BBSY timing signal (in units of 1 DMA) sent out by the trace timing circuit 14. This trace can be shared with expansion adapters currently in operation or scheduled to operate.
This is done for the adapter for expansion one DMA unit earlier.

The trace information of the expansion adapter traced by the tracer 8 is displayed on the panel display device 16 via the readout circuit 15 or displayed on the host
By connecting to the line 17 connected to the CPU, recovery processing after a hangup can be quickly performed as described below.

If the three systems of system expansion devices hang up, the CPU 1 only monitors the BR and BG signals for system expansion device 3, so which expansion DMA adapter is operating or scheduled to operate? Although it is not known whether the tracer 8 stopped, regardless of the state of the expansion bus 7,
The contents of the trace can be displayed, and from the panel display device 16 that displays the trace information of the tracer 8, it is possible to easily know which expansion adapter caused the hang-up.
Therefore, the failed expansion DMA on expansion bus 7
Adapters can be easily separated.

〔Effect of the invention〕

As explained above, according to the present invention, even if the expansion bus hangs up, the expansion adapter that is operating or scheduled to operate at the time of the hangup and the 1DMA
The expansion adapter in front of the unit can be easily identified, which makes it easy to isolate the failed expansion adapter, and also
Recovery processing from the CPU is also easier, making it possible to build a highly reliable system.

[Brief explanation of drawings]

FIG. 1 is a basic configuration diagram of a status monitoring device for a system expansion device according to the present invention, FIG. 2 is a configuration diagram of an embodiment of the status monitoring device for a system expansion device according to the present invention, and FIG. 3 is a diagram of a conventional expansion system. Configuration diagram, 4th
The figure shows a time chart of each signal to explain the operation of a conventional system expansion device. In the figure, 1 is a CPU, 2 is a memory, 3 is a system expansion device, 4-1 to 4-k are adapters, and 5-
1 to 5-k are adapters, 6 is a basic bus, 7 is an expansion bus, 8 is a tracer, 9 is a display means, 10 is a comparison circuit, 11 is a system expansion section, 12 is an interface circuit, 13 is a decoder, and 14 is a A trace timing circuit, 15 a readout circuit, and 16 a panel display device.

Claims (1)

[Claims] 1. Basic bus 6 to which a plurality of adapters 4 are connected
, a system expansion device 3 connected to the basic bus 6 in order to expand the system, and an expansion bus 7 connected to a plurality of expansion adapters 5 and subordinate to the system expansion device 3, The system expansion device 3 transmits a bus dominance request signal (BRm) that can be specified on the expansion bus 7 from one of the expansion adapters 5 connected to the expansion bus 7 to the basic bus 6.
Then, the bus mastership request signal (BRn) specified only on the basic bus 6 is converted and sent, and the bus permission signal (BGn) specified on the basic bus 6 is sent to the expansion bus 6. In an expansion system configured to convert the bus permission signal (BGm) specified above and supply it to one of the expansion adapters 5, and expand DMA transfer of the system, an expansion bus Each expansion adapter 5 connected to 7
The history of making it possible to identify various signals given the specific information specified on the expansion bus 7 from
A tracer 8 for tracing each DMA operation is provided on the expansion bus 7, and a display means 9 is provided for displaying the history contents traced by the tracer 8, and each expansion adapter 5 connected to the expansion bus 7
A status monitoring device for a system expansion device, characterized in that the status monitoring device monitors the status of the system expansion device.