Interface

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 polynominal where DD0 is shifted in first and DD15 is shifted in last.

DD0–DD15

 

CRCIN

 

CRCOUT

 

 

F1–f16

 

Latch

16

Combination

16

16

 

logic

16

 

Word

 

 

 

clock

 

 

 

 

Figure 5.8 An example of generation of parallel CRC

Table 5.14 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 f2 = DD1 XOR CRCOUT14 f3 = DD2 XOR CRCOUT13 f4 = DD3 XOR CRCOUT12 f5 = DD4 XOR CRCOUT11 f6 = DD5 XOR CRCOUT10 f7 = DD6 XOR CRCOUT9 f8 = DD7 XOR CRCOUT8

 

f9

= DD8

XOR CRCOUT7 XOR f5

 

 

f10

= DD9

XOR CRCOUT6 XOR f6

 

 

f11

= DD10 XOR CRCOUT5 XOR f7

 

 

f12

= DD11 XOR CRCOUT4 XOR f1

XOR f8

XOR f1

f13

= DD12 XOR CRCOUT3 XOR f2

XOR f9

XOR f2

f14

= DD13 XOR CRCOUT2 XOR f3

XOR f10

XOR f3

f15

= DD14 XOR CRCOUT1 XOR f4

XOR f11

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)

5-90

C141-E050-02EN

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Fujitsu MHD2021AT, MHC2032AT, MHC2040AT, MHD2032AT manual XOR f11

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.