JPH05158627A - Disk device - Google Patents

Abstract

PURPOSE:To enable a host device to analyze the execution details of a control program on the disk device and the details of transfer on a bus. CONSTITUTION:This SCSI hard disk device which is connected to the host device by a bus interface and has a microcomputer internally consists of a disk mechanism part 1, a data decoder part 2, a data encoder part 3, a disk controller part 4, a buffer memory part 5, a DMA controller part 6, a CPU part 7, a ROM part 8, a RAM part 9, an FIFO controller part 10, and an FIFO part 11 and is connected to the host device through the SCSI bus. Then the FIFO controller part 10 monitors the details of the state change of a SCSI bus signal, and the details are stored in the FIFO part 11 on a lap-around basis and read out at a request from the host device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device,
In particular, the present invention relates to a technology effectively applied to an intelligent disk device having a microcomputer therein, which is applied to a disk device in which details of the operation history of the disk device can be accurately managed from a host device.

[0002]

2. Description of the Related Art Conventionally, SCSI (Small Computer Syste
m interface) hard disk drive, AN
As described in Chapter 7 Section 7.1.2 of SI Standard X3131-1986 SCSI Japanese Translation (issued by the Japanese Standards Association), the higher-level device can cut the hard disk device status by the REQUEST SENSE command. You can do it.

[0003]

However, in the prior art as described above, even though the hard disk device has a microcomputer and is made intelligent, the sense key has a hardware error, a media error, and a knot. There is a drawback in that the detailed status of the hard disk device cannot be known because the sense code that collects and reports to typical errors such as ready and the like is also simple.

In addition, for example, even if the same hardware error occurs, if it is not known what kind of control is executed and what kind of result is obtained, the root cause of the error cannot be sought and trouble shooting is carried out. Requires a lot of man-hours,
There is a problem in that the reliability is significantly reduced.

Therefore, an object of the present invention is to solve such a conventional problem and provide a disk device in which a host device can analyze the execution history of a control program in the disk device and the transfer history on the bus. Especially.

The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

[0007]

Among the inventions disclosed in the present application, a brief description will be given to the outline of typical ones.
It is as follows.

That is, the disk device of the present invention is a disk device which is connected to a higher-level device by a bus interface and has a microcomputer inside. The process of executing a control program by the microcomputer or the state of a bus signal by the bus interface. Is constantly monitored, and the monitored contents are stored in an internal memory or disk medium.

[0009]

According to the disk device described above, the execution history of the control program or the state of the bus signal is stored in the memory or the disk medium, so that the reading can be performed in response to the request of the host device. For example,
A first-in first-out (FIFO) section and a FIFO controller section are provided inside the disk device, and the execution address history of the control program in the disk and the status change history of the SCSI bus signal are stored in the FIFO section in a wrap-around manner. Achieved by.

That is, the change in the signal on the SCSI bus is F
The IFO controller unit is constantly monitoring, and every time there is a change in these signals, the FIFO unit is made to write the values of all signals of the SCSI bus, and further, there is a change in state beyond the storage capacity of the FIFO unit. In this case, the new SCSI bus state can always be recorded by wrapping around the FIFO address so that it can be written. As a result, the higher-level device
By reading the data of the section, the cause analysis when an error occurs can be easily performed.

Similarly, the execution address of the control program inside the disk device is transferred by the FIFO controller to the FIFO.
When the program is executed exceeding the storage capacity of the FIFO unit, the FI
By wrapping around the FO address so that it can be written, the latest execution state can always be recorded. As a result, the host device can easily perform the cause analysis work when an error occurs by reading the data in the FIFO unit.

Further, by recording the data stored in the FIFO section on the disk medium, it is possible to prevent the above information from being lost even when the power of the disk device is turned off. That is, by recording the storage data of the FIFO unit on the medium of the disk device, it is possible to prevent the history of the SCSI bus and the control program from being lost by powering off. As a result, the cause of the error can be easily analyzed even after the power is turned off.

[0013]

Embodiment 1 FIG. 1 is a functional block diagram showing a disk device according to an embodiment of the present invention, and FIG. 2 is a SCSI for explaining the operation of a FIFO in the disk device of this embodiment.
It is a timing chart figure of a bus.

First, the configuration of the disk device of this embodiment will be described with reference to FIG.

The disk device of this embodiment is, for example, a SCSI hard disk device which is connected to a host device by a bus interface and has a microcomputer inside, and has a disk mechanism unit 1, a data decoder unit 2, a data encoder unit 3 and a disk controller. Unit 4, buffer memory unit 5, DMA controller unit 6, CPU (Cent
ral Processing Unit) 7, ROM (Read Only Memo)
ry) section 8, RAM (Random Access Memory) section 9, FI
It is composed of a FO controller unit 10 and a FIFO unit 11, and is connected to a host device (not shown) through a SCSI bus.

The disk mechanism section 1 is composed of a disk disk, a head, a seek motor, a spindle motor, etc., which are not shown, and an RLL (RunLength Limi) from the head.
ted) data is sent to the NRZ (Non
Return to Zero) data, and the data encoder section 3 modulates the NRZ data into RLL data.

The disk controller section 4 controls the entire read / write and seek operations of the disk mechanism section 1, read / write data is temporarily stored in the buffer memory section 5, and the disk controller section 4 and the buffer memory section are also stored. The internal DMA data transfer with the DMA controller 5 is performed by the DMA controller unit 6.

The CPU unit 7 is an SCSI hard disk device that controls the interface with a host and controls the execution of read / write operations by using the hardware resources of the disk controller unit 4, the DMA controller unit 6 and the buffer memory unit 5. And error check /
The control program of the CPU section 7 is resident in the ROM section 8, and the data processed by the control program is temporarily stored in the RAM section 9.

The FIFO unit 11 temporarily stores changes in the SCSI bus in a ring manner, and this control is performed by the FIFO controller unit 10.

Next, regarding the operation of this embodiment, the operation of the FIFO controller 10 which is a feature of the present invention will be described.
Description will be made based on the timing chart of the SCSI bus in FIG.

First, from the state of the Bus Free phase, the host system turns on the BSY (Busy) signal (low level), and on its DB (Data Bus) 0 to 7 signals, its own SCSI ID (Identification) and target. S
Send the CSI ID to start the Arbitration phase.

Then, as a result of the host system checking the DB0-7 signals, the SC having a higher priority than itself is
If there is no host / target having the SI ID, the SEL (Select) signal is turned on (low level), the ATN (Attention) signal is turned on (low level), and then the BSY (Busy) signal is turned off ( high level)
Then, the Arbitration phase is completed.

Subsequently, the host system starts the Selection phase while keeping the SEL signal on (low level), and sends its own SCSI on the DB0 to DB7 signals.
ID and SCSI of the hard disk drive you want to access
Send out the ID number.

After that, the hard disk device detects that the BSY signal is turned on (low level), turns off the SEL signal (high level), stops the data transmission onto the DB0 to DB7 signals, and selects phase. To end.

Next, from the hard disk device, C / D
(Control / Data) signal on (low level), I / O
(Input / Output) signal off (high level), MSG
If the REQ (Request) signal is transmitted as ON (low level) after the (Message) signal is transmitted as ON (low level), the upper system is
CK (Acknowledge) signal is turned on and DB0
A message (C0h) indicating that disconnect / reconnect is supported is transmitted on the ~ 7 signal and the Message is transmitted.
Start the Out phase.

After that, the upper system detects that the REQ signal is off (high level) and then sends ACK.
The signal is turned off, the data transmission to the DB0 to 7 signals is stopped, and all the C / D signal, I / O signal, and MSG signal are turned off to end the Message Out phase.

Then, from the hard disk device, C / D
The command phase is started by sending the signal on (low level), the I / O signal off (high level), and the MSG signal off (high level), and then sending the REQ signal on (low level). Then, the upper system turns on the ACK signal and the DB
Send command data on signals 0-7.

After that, the REQ signal is turned off (high level).
Is sent, the host system turns off the ACK signal and stops sending command data on the DB0 to DB7 signals. After that, the command data is sent out in several bytes in this way, and the Command phase is ended.

Next, the hard disk drive sends the C / D signal on (low level), the I / O signal on (low level), and the MSG signal on (low level) to start the Message phase. After that, the REQ signal is turned on (low level) and the message data is transmitted on the DB0 to 7 signals. In response to this, the upper system turns on the ACK signal and reports to the hard disk device that the message data has been received.

After that, the REQ signal is turned off (high level).
Is sent, the upper system turns off the ACK signal. After that, the hard disk device turns off the C / D signal (high level), turns off the I / O signal (high level), M
Send the SG signal off (high level) to send Mess
End the age phase.

Then, the hard disk device turns off the BSY signal (high level) and returns to the BUS Free phase to open the SCSI bus.

As described above, the state change of each signal of the SCSI bus is detected by the FIFO controller unit 10 and the F
It is stored in the IFO unit 11, and for example, this FIFO unit 11
If the storage capacity of 64 KB is set to 64 KB, the change of the SCSI bus for 64 KB is sequentially stored, and even if the change exceeds 64 KB, it is overwritten and the latest 64 KB is always stored.
Minute events are stored. Therefore, when the control of the hard disk device is interrupted due to an error, the host system can read the FIFO data to know the movement of the SCSI bus when the error occurred and before.

Therefore, according to the hard disk drive of this embodiment, since the FIFO controller unit 10 and the FIFO unit 11 are provided, the history of changes in the state of the SCSI bus signal is stored in a wraparound mode, so that the host system operates as a FIFO unit. By reading the data of 11, the cause analysis when an error occurs can be easily performed.

[0034]

Second Embodiment FIG. 3 is a functional block diagram showing a disk device which is another embodiment of the present invention.

The disk device of this embodiment is similar to the first embodiment in that the disk mechanism unit 1, the data decoder unit 2, the data encoder unit 3, the disk controller unit 4, the buffer memory unit 5, the DMA controller unit 6, and the CPU unit 7 are provided. , RO
It is composed of an M unit 8, a RAM unit 9, a FIFO controller unit 10 and a FIFO unit 11. The difference from the first embodiment is that the FIFO controller unit 10 is not the SCSI bus but the data bus of the CPU unit 7 inside the disk device. It is a connected point.

That is, in this embodiment, the FIFO
The controller unit 10 stores the program execution address in the FIFO unit 11 only when the instruction fetch of the CPU unit 7, that is, when the program execution address is fetched from the program memory unit, so that the control of the hard disk device is interrupted due to an error, for example. In addition, the host system can read the FIFO data to know the movement of the control program in the hard disk device at the time of error occurrence and before.

Therefore, according to the disk device of the present embodiment, the execution address history of the control program is stored in a wraparound. Therefore, as in the case of the first embodiment, an error occurs when the host system reads the data of the FIFO unit 11. It is possible to easily analyze the cause at the time of occurrence.

Although the invention made by the present inventor has been specifically described based on the first and second embodiments, the present invention is not limited to the above embodiments and various modifications can be made without departing from the scope of the invention. It goes without saying that it is possible.

For example, in the disk device of each of the above-described embodiments, the case where the history of changes in the state of the bus signal or the history of execution of the control program is stored in the FIFO unit 11 has been described, but the present invention is limited to the above embodiments. However, the present invention can be widely applied to the case of storing on a disk medium forming a track map as shown in FIG.

In this case, a disk medium is provided in the disk mechanism unit 1 and the track address (hexadecimal value) "00" is set.
The disk system management information as a hard disk device is stored from 0 "to" 001 ", the defective block replacement information from" 002 "to" 003 ", and" 004 ".
From the first to the "02F", the FIFO unit 11 as described above
Is stored, and user data is stored at track addresses "030" to "3FF".

As a result, the data is not lost even when the power of the hard disk device is turned off, so that the control program in the hard disk device can perform the read / write control as described above.

Also, when monitoring the bus signal, S
The present invention is applicable not only to the CSI bus but also to devices connected to various system buses.

In the above description, the case where the invention made by the present inventor is mainly applied to the hard disk device which is the field of application thereof has been described, but the present invention is not limited to this, and other disk devices and disk devices. Not limited to the above, the present invention can be widely applied to other input / output devices having a microcomputer therein.

[0044]

The effects obtained by the typical ones of the inventions disclosed in the present application will be briefly described as follows.
It is as follows.

(1). The process of execution of a control program by a microcomputer or the state of a bus signal by a bus interface is constantly monitored, and the monitored contents are stored in an internal memory or a disk medium. When the status change history of is stored in order, the higher-level device can read the stored information as needed, so that it is possible to know what was transferred on the bus and investigate the cause of the error occurrence. And the analysis becomes easy.

(2) According to the above (1), for example, when the execution addresses of the control program are stored in order, the upper device can read the stored information as needed, so It is possible to know what was being executed by the control program, and it is possible to easily investigate the cause of the error occurrence and analyze it.

(3) By the above (1), for example, when the monitor contents are recorded on the disk medium, it is possible to prevent the loss of information even when the power of the disk device is turned off. Even after that, it is possible to easily investigate the cause of the error and analyze it.

(4) According to the above (1) to (3), it is possible to accurately manage the details of the operation history of the disk device from the host device, especially in an intelligent disk device having a microcomputer inside. It is possible to obtain a disk device that can be used.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing a disk device that is Embodiment 1 of the present invention.

FIG. 2 is a timing chart of the SCSI bus for explaining the operation of the FIFO in the disk device of the first embodiment.

FIG. 3 is a functional block diagram showing a disk device that is Embodiment 2 of the present invention.

FIG. 4 is an explanatory diagram showing a case where the monitoring result is stored on a disk medium in the disk device according to the first and second embodiments of the present invention.

[Explanation of symbols]

 1 disk mechanism section 2 data decoder section 3 data encoder section 4 disk controller section 5 buffer memory section 6 DMA controller section 7 CPU section 8 ROM section 9 RAM section 10 FIFO controller section 11 FIFO section

Claims (1)

[Claims] 1. A disk device, which is connected to a host device by a bus interface and has a microcomputer therein, which constantly monitors the execution process of a control program by the microcomputer or the state of a bus signal by the bus interface, And the contents of the monitor are stored in an internal memory or a disk medium,
A disk device capable of being read in response to a request from the host device.