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Fujitsu MHD2021AT, MHC2032AT, MHC2040AT manual Phases of operation, Ultra DMA burst initiation phase

Models: MHC2040AT MHC2032AT MHD2032AT MHD2021AT

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Interface

Both the host and device perform a CRC function during an Ultra DMA burst. At the end of an Ultra DMA burst the host sends the its CRC data to the device. The device compares its CRC data to the data sent from the host. If the two values do not match the device reports an error in the error register at the end of the command. If an error occurs during one or more Ultra DMA bursts for any one command, at the end of the command, the device shall report the first error that occurred.

5.5.2 Phases of operation

An Ultra DMA data transfer is accomplished through a series of Ultra DMA data in or data out bursts. Each Ultra DMA burst has three mandatory phases of operation: the initiation phase, the data transfer phase, and the Ultra DMA burst termination phase. In addition, an Ultra DMA burst may be paused during the data transfer phase (see 5.5.3 and 5.5.4 for the detailed protocol descriptions for each of these phases, 5.6.4 defines the specific timing requirements). In the following rules DMARDY- is used in cases that could apply to either DDMARDY- or HDMARDY-, and STROBE is used in cases that could apply to either DSTROBE or HSTROBE. The following are general Ultra DMA rules.

a)An Ultra DMA burst is defined as the period from an assertion of DMACK- by the host to the subsequent negation of DMACK-.

b)A recipient shall be prepared to receive at least two data words whenever it enters or resumes an Ultra DMA burst.

5.5.2.1Ultra DMA burst initiation phase

a)The Ultra DMA burst initiation phase is started by the assertion of DMARQ signal by the device, and is ended when the transmitting side has inverted STROBE signal for transmitting the first data.

b)The Ultra DMA burst requires the assertion of DMARQ signal by the device.

c)The host asserts DMACK-signal when it is able to start the requested burst.

d)The host always asserts DMACK signal after detecting the first assertion of DMARQ signal.

e)Ultra DMA data in burst

The device starts transmission of the data to DD (15 : 0) when;

∙DMACK-signal assertion has been detected,

∙STOP signal negation has been detected, or

∙HDMARDY-signal assertion has been detected.

f)Ultra DMA data out burst

The device should not invert the state of this signal in the period from the moment of DMARQ signal assertion or DDMARDY-signal assertion to the moment of inversion of the first STROBE signal.

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C141-E050-02EN

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Fujitsu MHD2021AT, MHC2032AT, MHC2040AT, MHD2032AT manual Phases of operation, Ultra DMA burst initiation phase
Page 148 Page 150

MHC2040AT, MHC2032AT, MHD2032AT, MHD2021AT specifications

Fujitsu offers a range of advanced hard disk drives (HDD) designed for various computing needs, including the MHD2021AT, MHD2032AT, MHC2032AT, and MHC2040AT models. These drives combine reliable performance, capacity options, and technological features aimed at enhancing data storage efficiency.

The Fujitsu MHD2021AT is known for its capacity of 20 GB, making it an excellent choice for users requiring a compact and efficient HDD. With a spindle speed of 5400 RPM, it balances speed and power consumption, catering to mobile computing and lower power devices. Its ATA interface ensures compatibility with a wide range of systems, making it a versatile option for various applications.

The MHD2032AT model offers a slightly higher capacity of 30 GB, maintaining similar technological attributes to its predecessor. With an enhanced data transfer rate, it allows for quicker access to stored files, perfect for users handling larger volumes of data. The robust error correction features in this model further ensure data integrity, making it a reliable choice for demanding environments.

For users needing more robust storage solutions, the MHC2032AT steps it up with features tailored for performance-heavy applications. Its 30 GB capacity is suited for desktop and workstation environments that require swift data retrieval and significant storage. The drive employs advanced caching techniques, which boost performance further by optimizing read and write operations, ensuring smoother multitasking capabilities.

The MHC2040AT is the flagship model in this line, providing an impressive storage capacity of 40 GB. This HDD is designed for high-performance applications where speed is crucial. The drive’s increased spindle speed and superior data transfer rates make it ideal for video editing, gaming, and large database management. Alongside its enhanced performance features, it includes advanced thermal management technology that maintains optimal operational temperatures, prolonging the drive's lifespan.

All four models leverage Fujitsu's commitment to data reliability, featuring robust shock resistance and low noise levels. Collectively, these drives cater to a spectrum of user needs, from compact data storage to high-capacity solutions, maintaining Fujitsu's reputation for quality and innovation in the storage market.