JPH0594329A - Diagnostic device by scan path data - Google Patents

Abstract

PURPOSE:To facilitate the investigation for cause of trouble without needing a maintenance diagnosis exclusive-use bus for scan path data by providing an interface part, a saving memory, a control part and a processor part between a host device and a hardware register. CONSTITUTION:When an interface part 10 receives a sampling command CMD to sample scan path data from a host device, the part instructs a diagnosis action control part 30 and a processor part 40 to sample the scan path data. The control part 30 stores the scan path data sampled in accordance with the instruction into a saving memory 20 and when all scan path data are stored, performs the resetting instruction in a diagnosing device. When the processor part 40 receives the resetting instruction from the control part 30, the part performs the initialization of a hardware register 50, and after the completion of the initialization, sends the scan path data through the interface part 10 to the host device and performs the scan path data sampling completion report.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diagnostic device using a scan path, and more particularly to a diagnostic device for a magnetic disk controller.

[0002]

2. Description of the Related Art Conventionally, in order to collect information of a hardware register in a device such as a magnetic disk device of this type, data of the hardware register is serially connected bit by bit and a scan clock is input. By doing so, it has a scan path for reading the data of the hardware register connected serially. Conventionally,
In order to collect the data by this scan path to the host device side, this serial data must be transferred to the host device. Therefore, it is necessary to connect the host device and the magnetic disk device with a dedicated bus for maintenance diagnosis.

[0003]

The above-mentioned conventional method has a problem that a dedicated maintenance diagnosis bus for connecting the host device and the magnetic disk device is required.

[0004]

According to the diagnostic method of the present invention, a diagnostic device that supports a hardware data collection function based on scan path data receives a command from the host device to collect scan path data, An interface unit that issues a data collection instruction, a save memory that saves the collected scan path data, and a scan path data collection instruction from the interface unit that collects the scan path data from the diagnosis target and stores it in the save memory. The diagnostic operation control unit that issues an internal reset instruction after storing all scan path data and the internal device reset instruction from the diagnostic operation control unit initializes the diagnostic target.After the initialization, the interface unit is connected to the host device. Via the scan path data saved in the save memory. And a processor unit that performs Npasudeta collected end report.

[0005]

When the scan path data is collected from the host device via the interface, the diagnostic operation controller collects the scan path data from the diagnosis target and stores it in the save memory. When the storage is completed, the inside of the device is reset, and the scan path data stored in the save memory is sent by the processor unit to the host device via the interface unit.

[0006]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a diagnostic device using scan path data according to the present invention. The diagnostic device of this embodiment is arranged between a host device and a hardware register 50 (hereinafter referred to as HW register 50), and has an interface unit 10, a save memory 20, a diagnostic operation control unit 30 (hereinafter, control unit). 30)), processor unit 40
Consists of.

The interface unit 10 collects a command CMD indicating that scan path data should be collected from the host device.
Upon receiving the instruction, the control unit 30 and the processor unit 40 are instructed to collect scan path data. The control unit 30 stores the scan path data collected according to the instruction in the save memory 20, and issues a reset instruction in the diagnostic device when the storage of all the scan path data is completed.
When the processor unit 40 receives the reset instruction from the control unit 30, the processor unit 40 initializes the HW register 50, sends the scan path data to the higher-level device through the interface unit 10 and reports the completion of the scan path data collection after the initialization is completed. ..

Next, the operation example of the above embodiment will be described in more detail.

When a scan path data collection instruction is received from a host device in which a hardware failure or the like has occurred on the magnetic disk control device, the interface unit 10 that has received the scan path data collection instruction sends a scan path data collection instruction to the HW register 50. This is performed in the control unit 30 and the processor unit 40. Control unit 30 that received the instruction to collect scan campus data
Collects the scan path data of the HW register 50 and writes the collected data in the save memory 20. After reading all scan path data, the control unit 30 issues an in-apparatus reset instruction to the processor unit 40. The processor unit 40 that has received the previous in-device reset instruction uses the HW register 5 in the device.
0 is initialized, and when the initialization is completed, the save memory 20
The scan path data stored in (1) and the completion of scan path data collection are reported to the host device through the interface unit 10. Upon receiving the report, the higher-level device can read the data written in the save memory 20 to read the data on the scan path.

[0011]

As described above, according to the present invention, the scan path data can be collected by the firmware (FW), which has been impossible in the past, and the scan path data can be acquired without the need for a dedicated maintenance diagnosis bus. It can be collected from the host device. This has the effect of facilitating the investigation of the cause of the failure.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a diagnostic device using scan path data according to the present invention.

[Explanation of symbols]

 10 interface unit 20 save memory 30 control unit 40 processor unit 50 HW register (hardware register)

Claims (2)

[Claims] 1. A diagnostic device that supports a hardware data collection function using scan path data, receives an instruction from a host device to collect scan path data, and issues an instruction to collect scan path data. A save memory for saving scan scan data and a scan path data collection instruction from the interface part are collected, the scan path data is collected from the diagnosis target and stored in the save memory, and an in-device reset instruction is issued after storing all scan path data. The diagnostic operation control unit to be performed and the device to be diagnosed are initialized in response to the in-device reset instruction from the diagnostic operation control unit, and after the initialization is completed, it is saved to the save memory via the interface unit to the host device Send the campus data and report the completion of scan pass data collection Diagnostic apparatus characterized by comprising a processor unit. 2. The diagnostic device according to claim 1, wherein the command and the data are exchanged via an existing data bus.