FUJITSU DISK DRIVES MHM215OAT User Manual
Page 16

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