5.5 Ultra DMA Feature Set

b)Host pausing an Ultra DMA data in burst

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

2)The host shall pause an Ultra DMA burst by negating HDMARDY-.

3)The device shall stop generating DSTROBE edges within tRFS of the host negating HDMARDY-.

4)If the host negates HDMARDY- within tSR after the device has generated a DSTROBE edge, then the host shall be prepared to receive zero or one

additional data words. If the host negates HDMARDY- greater than tSR after the device has generated a DSTROBE edge, then the host shall be prepared to receive zero, one or two additional data words. The

additional data words are a result of cable round trip delay and tRFS timing for the device.

5)The host shall resume an Ultra DMA burst by asserting HDMARDY-.

5.5.3.4Terminating an Ultra DMA data in burst

a)Device terminating an Ultra DMA data in burst

The following steps shall occur in the order they are listed unless otherwise specifically allowed (see 5.6.4.5 and 5.6.4.2 for specific timing requirements):

1)The device shall initiate termination of an Ultra DMA burst by not generating DSTROBE edges.

2)The device shall negate DMARQ no sooner than tSS after generating the last DSTROBE edge. The device shall not assert DMARQ again until after the Ultra DMA burst is terminated.

3)The device shall release DD (15:0) no later than tAZ after negating

DMARQ.

4)The host shall assert STOP within tLI after the device has negated DMARQ. The host shall not negate STOP again until after the Ultra DMA burst is terminated.

5)The host shall negate HDMARDY- within tLI after the device has negated DMARQ. The host shall continue to negate HDMARDY- until the Ultra DMA burst is terminated. Steps (4) and (5) may occur at the same time.

6)The host shall drive DD (15:0) no sooner than tZAH after the device has negated DMARQ. For this step, the host may first drive DD (15:0) with the result of its CRC calculation (see 5.5.5):

C141-E104-02EN

5-97

Page 174
Image 174
Fujitsu MHM215OAT, MHM200AT, MHM2100AT, MHL2300AT manual Terminating an Ultra DMA data in burst, Dmarq

MHM215OAT, MHM200AT, MHL2300AT, MHM2100AT specifications

Fujitsu, a leader in storage technology, has developed a range of hard disk drives designed for reliability and performance, catering to both enterprise and consumer needs. The Fujitsu MHM2100AT, MHL2300AT, MHM200AT, and MHM215OAT models are part of this impressive lineup, showcasing various features and technologies that set them apart.

The MHM2100AT model is known for its 2.5-inch form factor, offering a storage capacity of 100GB. It operates at a speed of 5400 RPM, which balances performance and power efficiency. The drive utilizes ATA-6 interface (Parallel ATA) ensuring compatibility with a wide range of systems. One of its primary features is the advanced cache memory architecture, which allows for quicker access to frequently used data. This enhances overall system performance while preserving energy consumption.

The MHL2300AT provides a step up, with its 300GB of capacity. It also maintains a 5400 RPM speed and is designed for optimal heat dissipation and durability. This model is particularly suited for mobile computing applications due to its lightweight design and low power requirements. The MHL2300AT also integrates a sophisticated error correction code (ECC) technology, enhancing data integrity during storage and retrieval processes.

Moving on to the MHM200AT, this unit provides substantial storage of 200GB, maintaining a similar 5400 RPM speed. What sets the MHM200AT apart is its focus on data security with Built-in Security Features such as disk encryption capabilities. This model is suitable for professionals dealing with sensitive information, ensuring both performance and protection against data breaches.

Lastly, the MHM215OAT, another key model, balances user-friendly design with performance metrics. It offers a generous 150GB capacity and features an enhanced seek time for quick file access. With its emphasis on reliability, the MHM215OAT is often utilized in environments where uptime is critical, such as in commercial servers or high-performance workstations.

In conclusion, Fujitsu's MHM2100AT, MHL2300AT, MHM200AT, and MHM215OAT each possess unique features and technologies that cater to diverse user needs. Their combination of efficient power consumption, enhanced data integrity, and reliability make them compelling choices for businesses and individuals alike. Whether for mobile devices, personal computing, or enterprise applications, these models continue to exemplify Fujitsu's commitment to quality and performance in storage solutions.