CHAPTER 7 Error Analysis

7.1Error Analysis Information Collection

7.2Sense Data Analysis

This chapter explains in detail how sense data collected from a disk drive is used for troubleshooting. Sense data reflects an error in the disk drive, and helps with troubleshooting.

A sense key, additional sense code, and additional sense code qualifier, taken from various sense data are repeated. Also in this chapter, troubleshooting is performed using these three codes. Unless otherwise specified, "sense data" means the above three codes. When sense data is represented as (x-xx-xx), the leftmost x is a sense key, the middle xx is an additional sense code, and the rightmost x is an additional sense code qualifier.

7.1Error Analysis Information Collection

7.1.1Sense data

When the HDD posts a CHECK CONDITION status or detects a fatal error in the loop, the current command or queued command is cleared. In such a case, the HDD generates sense data about the command-issuing initiator. The initiator can read the sense data by reading the sense data added to the response frame of the command where an error occurred (Auto Sense function), or issuing a REQUEST SENSE command.

Even if a transfer byte length that is shorter than the sense data length of the tested device is specified, the command terminates normally. In this case, however, the initiator receives part of the sense data, but the remaining part of the sense data is lost.

For details of the Auto Sense function, refer to Section 2.6 “Sense Data Hold State” of the Fibre Channel Interface Specifications.

For details of the REQUEST SENSE command, refer to Subsection 4.1.14 “REQUEST SENSE (15)” of the Fibre Channel Interface Specifications.

7.1.2Sense key, additional sense code, and additional sense code qualifier

If an error is detected in a disk drive, the error status is indicated in the sense data collected from the disk drive. Figure 7.1 shows the positions of a sense key, additional sense code, and additional sense code qualifier.

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Fujitsu MAX3147FC, MAX3073FC, MAX3036FC manual Error Analysis Information Collection Sense Data Analysis
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MAX3147FC, MAX3036FC, MAX3073FC specifications

The Fujitsu MAX3036FC, MAX3073FC, and MAX3147FC are advanced integrated circuits that cater to a variety of high-performance applications, predominantly in the realm of communications and data transmission. Each model comes laden with unique features that help in addressing specific requirements in modern electronic systems.

The MAX3036FC, for instance, stands out due to its robust signal processing capabilities. It is particularly optimized for high-speed data communications, making it an excellent choice for applications that demand minimal latency and high data integrity. This featured IC operates within a wide voltage range, ensuring versatility in different circuit environments. It also adopts technology enabling low power consumption, an essential attribute in battery-operated devices.

In contrast, the MAX3073FC brings a distinct set of features suitable for more specialized applications. Its architecture supports a comprehensive serial data communication framework, making it ideal for designs that utilize various communication protocols, including those in industrial automation and automotive systems. The MAX3073FC supports advanced error correction mechanisms which enhance reliability, ensuring more accurate data transmission even over longer distances.

The MAX3147FC, on the other hand, focuses on integrating advanced timing and synchronization technologies. This model is particularly significant in applications that require precise timing signals, such as in telecommunications infrastructure and high-frequency trading systems. The MAX3147FC features integrated oscillators and buffers, streamlining the design process and reducing component count. Additionally, it boasts immunity to electromagnetic interference, a critical factor in maintaining signal integrity in noisy environments.

Common to all three models is Fujitsu's commitment to use cutting-edge manufacturing processes. This ensures the devices are compact, enhancing their suitability for modern designs where space is constrained. The ICs are also designed to handle varying temperature ranges, making them resilient for use in diverse environments.

Each IC is supported by comprehensive documentation and development tools that aid engineers in the rapid prototyping and deployment of their designs. The integration of these advanced features and technologies not only simplifies the design process but also accelerates time-to-market for new products. Whether addressing the demands of communication systems, industrial controls, or consumer electronics, the MAX3036FC, MAX3073FC, and MAX3147FC from Fujitsu represent exceptional flexibility and performance in the landscape of integrated circuit technology.
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