JP3655375B2 - Bus data transfer device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bus data transfer device, and more specifically, adjustment of a device during abnormal operation between a data processing device (hereinafter referred to as a host) and peripheral devices such as a magnetic disk device and an optical disk device connected by SCSI or the like. The present invention relates to a bus data transfer device capable of easily evaluating operation.
[0002]
[Prior art]
Conventionally, there are two methods for host-side interface mechanism and software debugging: connecting a peripheral device directly and connecting a simulator instead of the peripheral device.
In the case of the latter simulator, a simulator for simulating a peripheral device is usually connected to the host bus, and the host is caused to perform a pseudo operation of transmitting pseudo response data to the host as a pseudo device of the peripheral device. As a result, the host side interface mechanism and software are debugged.
The simulator is preinstalled with simulation response data necessary for executing the pseudo operation and a simulation program created for the conditions.
[0003]
[Problems to be solved by the invention]
This type of simulator requires creation of a simulation program for simulating various operations of peripheral devices, and it takes time to create a program according to various conditions. In addition to the normal operation of the response device, it is required to create the operation at the time of failure as the contents of the simulation program.
In this regard, when the former direct peripheral device is connected, it is not necessary to create a program. However, the normal operation is only confirmed by adjustments and evaluations performed according to the normal operation of the response device, and the operation at the time of failure cannot be confirmed in a normal state. Therefore, in the response device such as a peripheral device, it is necessary to cause a failure intentionally, and there is a problem that the peripheral device itself fails and becomes unusable.
An object of the present invention is to solve such problems of the prior art, and a bus data transfer device that can easily create a program and can easily realize failure and abnormal operation of a data processing device and peripheral devices. It is to provide.
[0004]
[Means for Solving the Problems]
A feature of the bus data transfer device of the present invention for achieving such an object is that the device is inserted into a bus connecting a predetermined peripheral device and a data processing device, and operates at the time of failure or specific operation. A condition data table storing transmission data generation condition data for generating transmission data having a condition different from that of the received transmission data in response to a predetermined command added to predetermined transmission data for switching to And detecting means for detecting whether or not a command sent in response to transmission data including a command sent on the bus by one of the operating states of the data processing device and the peripheral device matches the predetermined command. , given the condition data table when a command has been sent receives the detection signal of the detection means coincides with the predetermined command A data processing device that generates transmission data of different conditions by referring to the generation condition data corresponding to the command and replacing a part of the transmission data sent on the bus or a command with another, and in a predetermined procedure determined in advance and a transmission data replacement processing and transfer means for sending to any other peripheral device, sends a transmission data out feed when sending the command does not match to any other in said predetermined procedure Transmission data transfer means .
[0005]
DETAILED DESCRIPTION OF THE INVENTION
In this way, the data transfer device is inserted into the bus connecting the peripheral device and the data processing device, and when a predetermined command is generated in this, the transmission data is separately generated and the generated data is replaced with the transmitted data. By adding a function for transmitting the data, it becomes possible to send data to the other party in response to an abnormal operation or failure of the peripheral device or the data processing device when a predetermined command is generated.
The separate transmission data generation function is performed by the detection means and the transmission data replacement processing / transfer means which are bus data generation means and the transmission data transfer means in the above configuration, and the detection means is sent on the bus. When the command and a predetermined command are compared and they match, the bus data generating means transmits another transmission data instead of the original transmission data. Thereby, for example, when it is desired to generate an operation at the time of failure, a specific command is registered, and bus data of failure can be generated in correspondence with this command.
If the predetermined commands are not compared, the same data as the transmission data from the host is generated, or the reception data itself is sent to the peripheral device. The peripheral device performs an operation according to the transmitted data and returns a response as a result.
Similarly to the above, when there is a predetermined command for the response data of the peripheral device with respect to the transmission data from the host, the transmission data can be generated and transmitted to the host. At this time, if the command is not a predetermined command, the same data as the transmission data from the peripheral device is generated or the reception data itself is transmitted to the host as described above.
[0006]
In this way, the normal operation is assigned to the peripheral device and the data processing device, and the data at the time of abnormality or failure that cannot be generated by the peripheral device or the data processing device is assigned to the data transfer device. Then, by setting the command matching condition, failure transmission data or the like is easily generated by transmission data replacement processing in the data transfer apparatus.
As a result, when the peripheral device and the data processing device are in the operating state, switching to the operation at the time of failure or to a specific operation (corresponding to the above replacement process), a specific command added to the transmission data is detected by the detection means the when, the bus data transfer device, the generated shared transmission data corresponding to the operation of, or a particular operation at the time of failure, generates data that the bus data transfer device in this case occurs, failure The transmission data is limited to only the transmission data of a specific operation or a specific operation, and may be generated as transmission data corresponding to a predetermined command added to the transmission data. It is also easier than creating a failure simulation program.
By the way, in the embodiment, the detection means and the bus data generation means are realized by the MPU 7 executing the transfer condition determination program 9a and the failure data generation program 9b stored in the RAM 9, respectively, and are commands for comparison. Is stored in the condition table 9c.
[0007]
【Example】
1 is an explanatory diagram of an embodiment to which the bus data transfer device of the present invention is applied, FIG. 2 is an explanatory diagram of a condition table, FIG. 3 is an explanatory diagram of timing of transmission data transfer processing, and FIG. FIG. 5 is a function explanatory diagram of data transfer processing.
In FIG. 1, a host 1 and a magnetic disk drive 2 that is one of peripheral devices are connected by a bus via a bus data transfer device 3. 4 is an input / output interface for transferring data to and from the host 1 in the handshake mode connected to the SCSI bus 1a of the host 1, and 5 is a handshake connected to the SCSI bus 2a of the magnetic disk drive 2 in the same manner. This is an input / output interface that exchanges data with the magnetic disk drive 2 in the mode.
Reference numeral 6 denotes a bus connected to the MPU 7, which connects the input / output interfaces 4, 5, the ROM 8, the RAM 9, and the display 10 that displays the operation state to each other.
[0008]
The ROM 8 stores a control program for the MPU 7 and stores basic programs such as a program load program, a display program, and a data transmission / reception program 8a. The RAM 9 stores a transfer condition determination program 9a, a failure data generation program 9b, and a condition table 9c as programs loaded from the outside, and further includes a reception data area 9d and a transmission data area 9e.
In the following description, transmission of transmission data from the host 1 to the magnetic disk drive 2 will be mainly described. Since transmission from the magnetic disk drive 2 to the host 1 is performed in the same procedure, this is omitted except in special cases.
[0009]
The transfer condition determination program 9a is executed by the MPU 7 and operates in accordance with the control signal of the SCSI bus 1a obtained through the interface 4, and is hosted in a predetermined transmission / reception procedure (phase) shown in FIG. The transmission data on the 1 side is acquired and sequentially transferred to the reception data area 9d of the RAM 9. Then, at the time of receiving the command (CMD) in the transmission data transferred to the reception data area 9d, this is compared with the command registered in the condition table 9c shown in FIG. When these commands match, predetermined data indicating the failure data generation conditions stored in the condition table 9c is transferred to the work area of the RAM 9 and the failure data generation program 9b is called.
When these data do not match in the command data comparison in the condition table 9c, the transfer condition determination program 9a transfers the received data as it is to the transmission data area 9e of the RAM 9, calls the data transmission / reception program 8a, and executes it by the MPU 7. .
Since the transfer condition determination program 9a does not send a command for the transmission data of the magnetic disk drive device 2, no data is generated in response to the determination of the command of the magnetic disk drive device 2, but the command of the host 1 Accordingly, pseudo response data for the host 1 is similarly generated according to the data in the control data column 94 corresponding to the command of the host 1 when this response is obtained for the response data from the magnetic disk drive 2 to the host. .
Also, in the peripheral device that generates a command, the command of the transmission data from the peripheral device is compared in the same manner as described above, and pseudo failure data is generated according to the match. These operate according to the control signal of the SCSI bus 2a obtained through the interface 5, but the description thereof will be omitted.
[0010]
The data transmission / reception program 8a transfers the data in the transmission data area 9e to the SCSI bus 2a via the interface 5 in accordance with a control code in the transmission direction set in response to data reception according to a predetermined procedure shown in FIG. Send it out. In this case, when the control code in the transmission direction is the host 1 side, the transmission data in the transmission data area 9e is sent to the SCSI bus 1a via the interface 4.
Here, instead of the transmission direction control code, the transmission data area 9e may be divided into a transmission-only area for the magnetic disk drive 2 and a transmission-only area for the host 1. In this case, transmission data is set in each dedicated area according to the reception data of the host 1 or the magnetic disk drive 2. This may be similarly divided for the reception data area 9d.
[0011]
In FIG. 3A, BF is a bus free indicating a state where the bus is free, and SEL indicates a timing phase for selecting and acquiring the bus. MO is a timing phase of message output to the bus, and MI is a phase of message input to the bus. CMD is a command output timing phase to the bus, and DATA is a data output timing phase from the bus or a data input timing from the bus. Finally, the STS is a timing phase for generating current status, for example, status information such as busy or end.
Of these, the transmission data transferred to the RAM 9 is MO phase data, MI phase data, CMD phase data, DATA phase data, and STS phase data.
The condition table 9c shown in FIG. 2 will be described. The condition table 9c includes a CMD column 91 that stores a command as a predetermined comparison reference, and a phase column 92, a failure data column 93, a control data column 94, and the like corresponding to the commands in this column. . When the sent command matches the command in the CMD column 91, the corresponding data in the phase column 92, failure data column 93, control data column 94, etc. are transferred to a predesignated area in the RAM 9.
[0012]
The failure data generation program 9b refers to the data in the phase column 92, the failure data 93, the control data column 94, etc. transferred to the predetermined area of the RAM 9, and transmits the failure data in the designated phase. Is transferred to the transmission data area 9e of the RAM 9. Thereafter, the data transmission / reception program 8a is called to cause the MPU 7 to execute the data transmission / reception program 8a.
The phases in which the failure data generated here are inserted include data in phase (DATA), data out phase (DATA), message in phase (MI), message out phase (MO), and status phase (STS). Etc.
The contents of the failure data generated by the failure data generation program 9b include, for example, parity error data (generated on the bus), specific data, etc., depending on the data in the failure data column 83 and the data in the control data column 94. Status code (inserted in STS phase), fault message code (inserted in MI phase), overrun data (inserted in DATA), underrun data (inserted in DATA), etc. In addition to fault data, abnormal data Here, these are represented by failure data.
[0013]
In this way, when the command is a command for generating a preset failure with respect to transmission data sent to the bus 1a of the host 1, a match is seen on the condition table 9c, and a failure is determined according to this match. One of the data is generated and sent to the bus 2 a of the magnetic disk drive 2 via the interface 5. Similarly, failure data is similarly generated for the transmission data sent to the bus 2 a of the magnetic disk drive 2 and sent to the bus 1 a of the host 1 via the interface 4.
FIG. 3 (b) illustrates the timing of transmission of received data and transmission of received data by the bus data transfer device 3, where data is transmitted from the host 1 to the magnetic disk drive 2 and messages, The timing of data reception from the magnetic disk drive 2 and transfer to the host 1 regarding the status is shown. Note that MO is a phase that is inserted at any time, and in the figure, this phase is not inserted. Further, the phase is accelerated on the magnetic disk drive 2 side, which is a peripheral device, except for selection. This is because phase shift control is not permitted for peripheral devices in SCSI.
[0014]
When the bus data transfer device 3 receives transmission data from the host 1 or the magnetic disk drive device 2, for example, the interface 4 (or interface 5) inputs as a response signal to the input acknowledge control signal sent from the other party. Send a ready control signal to the other party. Thereafter, a phase change (PH change) on the bus is detected to confirm that the next phase (PH) has been entered, and the bus data transfer device 3 receives data.
When the bus data transfer device 3 sends transmission data to the host 1 or the magnetic disk drive device 2, for example, the interface 4 (or interface 5) sends a response signal (output ready) to the other party in response to the output acknowledge. Later, a phase change (PH change) on the bus is detected to confirm that the next phase (PH) has been entered, and transmission data is output.
Note that the timing from reception to transmission here is detected when the command (CMD) is received, and is performed according to the result.
[0015]
Next, the operation of the bus data transfer device 3 will be described with reference to FIGS. In FIG. 5, the reference numerals of the respective processing steps in FIG.
The MPU 7 reads out the control program from the ROM 8 after the bus data transfer device 3 is turned on, and starts the control operation of the various means shown in FIG.
In this case, for example, when a special code is input to the interface 4, the MPU 7 executes the load program and sends the transfer condition determination program 9 a and the failure data generation program 9 b to the RAM 9 as the main body of the program. Further, the condition table 9 c is stored in the RAM 9.
Therefore, the following description will be given on the assumption that such a program and table are already loaded in the RAM 9.
[0016]
When the transmission data is received from the host 1 or the magnetic disk drive 2 (step 101), the interface 4 captures this, and the transfer condition determination program 9a is executed by the MPU 7 to receive the transmission data from the interface 4 and transfer it to the RAM 9. (Step 102). Then, the command of the transmission data and the contents (command) of the condition table 9c are compared to determine whether or not they match (step 103). At this time, if the bus control signal is transmission from the host 1 side, the generated transmission data is sent to the magnetic disk drive 2 side, and vice versa.
If the determination at step 103 is “mismatch”, in other words, if the command is not registered in the condition table 9c, step 104 is entered, transmission data is transmitted, and the process is terminated.
If “match” is determined in the determination in step 103, in other words, if the command is registered in the condition table 9c, the fault data generation program 9b is executed by the MPU 7 to generate fault transmission data (step 105). ), Go to step 104. In this case, depending on the contents of the control data column 94 corresponding to the matched command, the transmission data from the host 1 is sent as it is, and failure transmission data is generated for the response data of the magnetic disk device 2 in response thereto. , It is returned to the host 1.
[0017]
As a result, if the commands do not match in accordance with the comparison of the commands by the transfer condition determination program 9a (including when the failure data is generated for the response data of the magnetic disk device 2), from the host 1. Is sent to the magnetic disk drive 2 as it is. Further, transmission data from the magnetic disk drive 2 is transmitted to the host 1 as it is.
If the commands match according to the command condition comparison by the transfer condition determination program 9a, first, the failure data is generated for the transmission data from the host 1 according to the contents of the control data column 94. Generated by the program 9b and sent to the magnetic disk device 2, or secondly, when response data is received from the magnetic disk drive device 2 in accordance with the contents of the control data column 94, a failure data generation program for this is received. Failure data is generated by 9b and failure response data is sent to the host 1.
As a result, the host 1 and the magnetic disk drive 2 perform normal responses through the bus data transfer device 3. The response result is stored in the memory of the host 1 or the like.
[0018]
As described above, in the embodiment, generation of failure data or abnormal data has been described. However, the present invention is not limited to failure data, and various peripheral devices such as a magnetic disk drive device may be used. Of course, the bus data transfer device may generate transmission data for a special operation that is in a normal operation state and hardly occurs.
In the embodiment, the command comparison is described to generate specific transmission data when the command is matched once. However, this is not one time, but only after the same command is detected multiple times. It goes without saying that specific transmission data may be generated and replaced by conditioning to generate transmission data.
In addition, it is also possible to generate failure data when there is a message that is a certain command, for example, by combining command matching and other conditions.
[0019]
【The invention's effect】
In the present invention, a data transfer device is connected between the host and the peripheral device, and normal operation is transferred to the peripheral device or data transfer device for operations other than normal operation, for example, operation at the time of failure. Since the transmission data is generated and transmitted in a pseudo manner by the devices, the generation of the transmission data is shared by each device. As a result, transmission data can be easily generated for a response operation to the host or peripheral device at the time of failure or the like under any conditions without destroying the data processing device or the peripheral device.
In addition, since the data generation processing program of the data transfer apparatus simply has a limited operation such as a failure operation under a specific condition, the program can be easily created and the number of creation steps can be reduced.
As a result, it is easy to create a program, and it is possible to easily simulate an abnormal operation of the data processing device or peripheral device, and it is possible to easily debug or evaluate the data processing device or peripheral device.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an embodiment to which a bus data transfer device of the present invention is applied.
FIG. 2 is an explanatory diagram of a condition table.
FIG. 3 is an explanatory diagram of timing of transmission data transfer processing, where (a) is an explanatory diagram of a general SCSI control procedure, and (b) is a data transfer process of a bus data transfer device; It is explanatory drawing of a procedure.
FIG. 4 is a flowchart of the processing.
FIG. 5 is a functional explanatory diagram of data transfer processing;
[Explanation of symbols]
1 ... Host, 1a, 2a ... SCSI bus,
2 ... Magnetic disk drive,
3 ... Bus data transfer device 4,5 ... Input / output interface,
6 ... bus, 7 ... MPU, 8 ... ROM,
9 ... RAM, 10 ... display.

Claims (3)

A device inserted into a bus connecting a predetermined peripheral device and a data processing device, and corresponds to a predetermined command added to transmission data determined in advance for switching to an operation at the time of failure or a specific operation. And a condition data table storing transmission data generation condition data for generating transmission data under conditions different from the received transmission data, and one of the data processing device and the peripheral device is in the operating state. Detection means for receiving transmission data including a command sent above and detecting whether or not the sent command matches the predetermined command, and the command sent in response to the detection signal of the detection means the generation condition data corresponding to the predetermined command of the condition data table when the command matches The data processing device and the peripheral device are generated in accordance with a predetermined procedure by generating transmission data of the different conditions obtained by replacing a part of the transmission data sent on the bus with reference to the other or the command. and transmitting data replacement processing and transfer means for sending to any other device, sends the transmission data before Symbol dispatched when a command to the delivery does not coincide with respect to the other one by the predetermined procedure A bus data transfer device comprising: a transmission data transfer means for performing. A device inserted into a bus connecting a predetermined peripheral device and a data processing device, and corresponds to a predetermined command added to transmission data determined in advance for switching to an operation at the time of failure or a specific operation. A transmission including a condition data table storing transmission data generation condition data for generating transmission data under conditions different from the received transmission data, and a first command sent by the data processing device on the bus First detection means for detecting whether or not the first command matches the predetermined command upon receipt of data, and the first command in response to a detection signal from the first detection means transmission des that sent onto the bus by referring to the generation condition data corresponding to the predetermined command before Symbol condition data table when the command matches First transmission data replacement processing for sending to the peripheral device a part or the first command data in a predetermined procedure determined roughness steering and generates transmission data for substituted different conditions to others - a transfer unit, a first transmission data transfer means for transmitting the transmission data before SL sent to the peripheral device by said predetermined procedure when the first command does not match, the peripheral device Second detection means for receiving transmission data including a second command sent on the bus and detecting whether the second command matches the predetermined command; and a second detection means When the detection command is received and the second command matches the predetermined command, the generated condition data corresponding to the predetermined command in the condition data table is referred to and transmitted on the bus. The second transmission data replacement processing part of the transmission data or the second command to generate transmission data of the substituted different conditions to others and sends to the data processing device at the predetermined procedures, A bus data transfer device comprising: transfer means; and second transmission data transfer means for sending the sent transmission data to the data processing device in the predetermined procedure when the second command does not match.   3. The bus data transfer according to claim 2, wherein the data processing device and the peripheral device are respectively connected in a handshake mode, and the command to be replaced or the data to be replaced causes a malfunction in the data processing device or the peripheral device. apparatus.

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