5.5 Ultra DMA Feature Set

Note: Since no bit clock is available, the recommended approach for calculating CRC is to use a word clock derived from the bus strobe. The combinational logic shall then be equivalent to shifting sixteen bits serially through the generator polynomial where DD0 is shifted in first and DD15 is shifted in last.

DD0–DD15

16

Combination logic

CRCIN

F1–f16 16

Word

16 clock

Latch

CRCOUT

16

Figure 5.8 An example of generation of parallel CRC

Table 5.16 Parallel generation equation of CRC polynomial

CRCINO=f16

CRCIN8 = f8

XOR f13

 

 

 

 

 

CRCIN1=f15

CRCIN9 = f7

XOR f12

 

 

 

 

CRCIN2=f14

CRCIN10 = f6

XOR f11

 

 

CRCIN3=f13

CRCIN11 = f5 XOR f10

 

 

 

CRCIN4=f12

CRCIN12 = f4

XOR f9 XOR f16

 

 

 

CRCIN5=f11 XOR f

CRCIN13 = f3

XOR f8 XOR f15

 

 

 

 

CRCIN6=f10 XOR f15

CRCIN14 = f2

XOR f7

XOR f14

 

 

 

 

CRCIN7=f9 XOR f14

CRCIN15 = f1

XOR f6

XOR f13

 

 

 

 

f1 = DD0

XOR CRCOUT15

 

f9

= DD8

XOR CRCOUT7 XOR f5

 

f2 = DD1

XOR CRCOUT14

 

f10 = DD9

XOR CRCOUT6 XOR f6

 

f3 = DD2

XOR CRCOUT13

 

f11 = DD10

XOR CRCOUT5 XOR f7

 

f4 = DD3

XOR CRCOUT12

 

f12 = DD11

XOR CRCOUT4 XOR f1

XOR f8

f5

= DD4

XOR CRCOUT11

XOR f1

f13 = DD12

XOR CRCOUT3 XOR f2

XOR f9

f6

= DD5

XOR CRCOUT10

XOR f2

f14

= DD13

XOR CRCOUT2 XOR f3

XOR f10

f7

= DD6

XOR CRCOUT9

XOR f3

f15

= DD14

XOR CRCOUT1 XOR f4

XOR f11

f8

= DD7

XOR CRCOUT8

XOR f4

f16

= DD15 XOR CRCOUT0 XOR f5

XOR f12

DD :

Data from bust

f :

Feedback

 

 

CRCIN : Output of combination logic (the next CRC)

CROUT : Result of 16 bit latch (current CRC)

C141-E104-02EN

5-105

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Image 182
Fujitsu MHM215OAT, MHM200AT, MHM2100AT, MHL2300AT manual XOR Crcout

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.