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FUJITSU DISK DRIVES MHM215OAT User Manual

Page 16

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Contents

C141-E104-02EN

xi

4.6.2

Write circuit 4-11

4.6.3

Read circuit 4-13

4.6.4

Digital PLL circuit 4-14

4.7

Servo Control 4-15

4.7.1

Servo control circuit 4-15

4.7.2

Data-surface servo format 4-18

4.7.3

Servo frame format 4-20

4.7.4

Actuator motor control 4-21

4.7.5

Spindle motor control 4-22

CHAPTER 5

Interface..................................................................................... 5-1

5.1

Physical Interface 5-2

5.1.1

Interface signals 5-2

5.1.2

Signal assignment on the connector 5-3

5.2

Logical Interface 5-6

5.2.1

I/O registers 5-7

5.2.2

Command block registers 5-8

5.2.3

Control block registers 5-13

5.3

Host Commands 5-13

5.3.1

Command code and parameters 5-14

5.3.2

Command descriptions 5-16

5.3.3

Error posting 5-83

5.4

Command Protocol 5-85

5.4.1

Data transferring commands from device to host 5-85

5.4.2

Data transferring commands from host to device 5-87

5.4.3

Commands without data transfer 5-89

5.4.4

Other commands 5-90

5.4.5

DMA data transfer commands 5-90

5.5

Ultra DMA Feature Set 5-92

5.5.1

Overview 5-92

5.5.2

Phases of operation 5-93

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