5.5 Ultra DMA Feature Set

7)The host shall release DD (15:0) within tAZ after asserting DMACK-.

8)The device may assert DSTROBE tZIORDY after the host has asserted DMACK-. Once the device has driven DSTROBE the device shall not release DSTROBE until after the host has negated DMACK- at the end of an Ultra DMA burst.

9)The host shall negate STOP and assert HDMARDY- within tENV after asserting DMACK-. After negating STOP and asserting HDMARDY-, the host shall not change the state of either signal until after receiving the first transition of DSTROBE from the device (i.e., after the first data word has been received).

10)The device shall drive DD (15:0) no sooner than tZAD after the host has asserted DMACK-, negated STOP, and asserted HDMARDY-.

11)The device shall drive the first word of the data transfer onto DD (15:0). This step may occur when the device first drives DD (15:0) in step (10).

12)To transfer the first word of data the device shall negate DSTROBE within tFS after the host has negated STOP and asserted HDMARDY-. The device shall

negate DSTROBE no sooner than tDVS after driving the first word of data onto DD (15:0).

5.5.3.2 The data in transfer

The following steps shall occur in the order they are listed unless otherwise specifically allowed (see 5.6.3.3 and 5.6.3.2 for specific timing requirements):

1)The device shall drive a data word onto DD (15:0).

2)The device shall generate a DSTROBE edge to latch the new word no sooner

than tDVS after changing the state of DD (15:0). The device shall generate a DSTROBE edge no more frequently than tCYC for the selected Ultra DMA Mode. The device shall not generate two rising or two falling DSTROBE edges more frequently than 2tCYC for the selected Ultra DMA mode.

3)The device shall not change the state of DD (15:0) until at least tDVH after generating a DSTROBE edge to latch the data.

4)The device shall repeat steps (1), (2) and (3) until the data transfer is complete or an Ultra DMA burst is paused, whichever occurs first.

5.5.3.3Pausing an Ultra DMA data in burst

The following steps shall occur in the order they are listed unless otherwise specifically allowed (see 5.6.3.4 and 5.6.3.2 for specific timing requirements).

a)Device pausing an Ultra DMA data in burst

1)The device shall not pause an Ultra DMA burst until at least one data word of an Ultra DMA burst has been transferred.

C141-E221

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Fujitsu MHV2040AS, MHV2080AS, MHV2060AS manual Data in transfer, Pausing an Ultra DMA data in burst
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MHV2060AS, MHV2080AS, MHV2040AS specifications

Fujitsu's MHV series of hard disk drives, specifically the MHV2040AS, MHV2080AS, and MHV2060AS models, are designed to deliver efficient performance and reliability for a range of applications, particularly in desktop computing and entry-level servers. Each of these drives adheres to the Serial ATA (SATA) interface, which ensures compatibility across a wide range of systems and is known for its cost-effectiveness and simplicity.

The MHV2040AS features a storage capacity of 40GB, making it suitable for basic computing tasks including document editing, web browsing, and media playback. The MHV2060AS steps it up with a 60GB capacity, allowing for increased data storage needs while still maintaining a high level of performance. The largest of the trio, the MHV2080AS, offers an impressive 80GB of space, positioning it well for users who require additional room for applications, games, and multimedia files.

All drives in this series are equipped with a rotational speed of 5400 RPM, which strikes a balance between speed and power consumption. This speed is adequate for everyday tasks and allows for quick boot times and file access, making them ideal for home and small office environments. Additionally, the drives feature an average latency of 5.5 milliseconds, contributing to their overall performance in retrieving data.

In terms of technology, the MHV series employs a fluid dynamic bearing (FDB) motor, which not only enhances reliability but also reduces noise levels during operation. The FDB technology helps improve the longevity of the drives by minimizing wear on mechanical components. This characteristic is particularly important for users seeking quieter drives, especially in work environments that require minimal disruption.

The drives also incorporate advanced power management features that significantly reduce power consumption, making them an environmentally friendly choice for users mindful of their carbon footprint. These drives are equipped with energy-saving modes that optimize their performance when not in full use, ensuring lower operational costs and longer lifespan.

Overall, the Fujitsu MHV2040AS, MHV2080AS, and MHV2060AS hard drives provide a solid solution for users looking for dependable storage with a range of capacities to fit their needs. Their performance, combined with noise reduction technologies and energy efficiency, makes them a notable choice for various computing environments, from single-user desktops to small business applications.
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