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Fujitsu MPD3173AT Product Manual - Page 59

Time base generator circuit, Table 4.2, Write clock frequency and transfer rate of each zone, Servo

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4.6.4 Time base generator circuit The drive uses constant density recording to increase total capacity. This is different from the conventional method of recording data with a fixed data transfer rate at all data area. In the constant density recording method, data area is divided into zones by radius and the data transfer rate is set so that the recording density of the inner cylinder of each zone is nearly constant. The drive divides data area into 15 zones to set the data transfer rate. Table 4.2 describes the data transfer rate and recording density (BPI) of each zone. Table 4.2 Write clock frequency and transfer rate of each zone Zone Cylinder (except MPD3130AT) Cylinder (MPD3130AT) Transfer rate [MB/s] 0 0 to 1174 0 to 1302 26.11 1 1175 to 1760 1303 to 1865 25.66 2 1761 to 2047 1866 to 2148 25.43 3 2048 to 3600 2149 to 3698 24.16 4 3601 to 4208 3699 to 4295 23.64 5 4209 to 4830 4296 to 4918 23.09 6 4831 to 5448 4919 to 5538 22.53 7 5449 to 6630 5539 to 6718 21.44 Zone Cylinder (except MPD3130AT) Cylinder (MPD3130AT) Transfer rate [MB/s] 8 6631 to 7585 6719 to 7670 20.52 9 7586 to 8485 7671 to 8565 19.63 10 11 12 13 14 8486 to 9952 9953 10961 11465 12465 to to to to 10960 11464 12464 13032 8566 10023 11016 11495 12515 to to to to to 10022 11015 11494 12514 13032 18.12 17.06 16.54 15.40 14.52 The MPU transfers the data transfer rate setup data (SDATA/SCLK) to the RDC that includes the time base generator circuit to change the data transfer rate. 4.7 Servo Control The actuator motor and the spindle motor are submitted to servo control. The actuator motor is controlled for moving and positioning the head to the track containing the desired data. To turn the disk at a constant velocity, the actuator motor is controlled according to the servo data that is written on the data side beforehand. 4 - 14 C141-E069-02EN

Section	Page
Front title	1
PREFACE	4
CONTENTS	8
FIGURES	12
TABLES	14
CHAPTER 1 DEVICE OVERVIEW	16
1.1 Features	16
1.1.1 Functions and performance	16
1.1.2 Adaptability	17
1.1.3 Interface	17
1.2 Device Specifications	19
1.2.1 Specifications summary	19
1.2.2 Model and product number	20
1.3 Power Requirements	20
1.4 Environmental Specifications	23
1.5 Acoustic Noise	23
1.6 Shock and Vibration	24
1.7 Reliability	24
1.8 Error Rate	25
1.9 Media Defects	25
CHAPTER 2 DEVICE CONFIGURATION	26
2.1 Device Configuration	26
2.2 System Configuration	28
2.2.1 ATA interface	28
2.2.2 1 drive connection	28
2.2.3 2 drives connection	28
CHAPTER 3 INSTALLATION CONDITIONS	30
3.1 Dimensions	30
3.2 Mounting	32
3.3 Cable Connections	36
3.3.1 Device connector	36
3.3.2 Cable connector specifications	37
3.3.3 Device connection	37
3.3.4 Power supply connector (CN1)	38
3.3.5 System configuration for Ultra DMA	38
3.4 Jumper Settings	41
3.4.1 Location of setting jumpers	41
3.4.2 Factory default setting	42
3.4.3 Jumper configuration	42
CHAPTER 4 THEORY OF DEVICE OPERATION	46
4.1 Outline	46
4.2 Subassemblies	46
4.2.1 Disk	46
4.2.2 Head	47
4.2.3 Spindle	49
4.2.4 Actuator	49
4.2.5 Air filter	49
4.3 Circuit Configuration	50
4.4 Power-on Sequence	52
4.5 Self-calibration	54
4.5.1 Self-calibration contents	54
4.5.2 Execution timing of self-calibration	55
4.5.3 Command processing during self-calibration	55
4.6 Read/write Circuit	56
4.6.1 Read/write preamplifier (PreAMP)	56
4.6.2 Write circuit	56
4.6.3 Read circuit	58
4.6.4 Time base generator circuit	59
4.7 Servo Control	59
4.7.1 Servo control circuit	60
4.7.2 Data-surface servo format	63
4.7.3 Servo frame format	63
4.7.4 Actuator motor control	65
4.7.5 Spindle motor control	66
CHAPTER 5 INTERFACE	68
5.1 Physical Interface	69
5.1.1 Interface signals	69
5.1.2 Signal assignment on the connector	70
5.2 Logical Interface	73
5.2.1 I/O registers	73
5.2.2 Command block registers	75
5.2.3 Control block registers	80
5.3 Host Commands	80
5.3.1 Command code and parameters	81
5.3.2 Command descriptions	83
5.3.3 Error posting	133
5.4 Command Protocol	134
5.4.1 Data transferring commands from device to host	134
5.4.2 Data transferring commands from host to device	136
5.4.3 Commands without data transfer	138
5.4.4 Other commands	139
5.4.5 DMA data transfer commands	139
5.5 Ultra DMA feature set	141
5.5.1 Overview	141
5.5.2 Phases of operation	142
5.5.3 Ultra DMA data in commands	142
5.5.3.1 Initiating an Ultra DMA data in burst	142
5.5.3.2 The data in transfer	143
5.5.3.3 Pausing an Ultra DMA data in burst	143
5.5.3.4 Terminating an Ultra DMA data in burst	144
5.5.4 Ultra DMA data out commands	146
5.5.4.1 Initiating an Ultra DMA data out burst	146
5.5.4.2 The data out transfer	147
5.5.4.3 Pausing an Ultra DMA data out burst	147
5.5.4.4 Terminating an Ultra DMA data out burst	148
5.5.5 Ultra DMA CRC rules	150
5.5.6 Series termination required for Ultra DMA	151
5.6 Timing	152
5.6.1 PIO data transfer	152
5.6.2 Multiword data transfer	153
5.6.3 Ultra DMA data transfer	154
5.6.3.1 Initiating an Ultra DMA data in burst	154
5.6.3.2 Ultra DMA data burst timing requirements	155
5.6.3.3 Sustained Ultra DMA data in burst	157
5.6.3.4 Host pausing an Ultra DMA data in burst	158
5.6.3.5 Device terminating an Ultra DMA data in burst	159
5.6.3.6 Host terminating an Ultra DMA data in burst	160
5.6.3.7 Initiating an Ultra DMA data out burst	161
5.6.3.8 Sustained Ultra DMA data out burst	162
5.6.3.9 Device pausing an Ultra DMA data out burst	163
5.6.3.10 Host terminating an Ultra DMA data out burst	164
5.6.3.11 Device terminating an Ultra DMA data in burst	165
5.6.4 Power-on and reset	166
CHAPTER 6 OPERATIONS	168
6.1 Device Response to the Reset	168
6.1.1 Response to power-on	169
6.1.2 Response to hardware reset	170
6.1.3 Response to software reset	171
6.1.4 Response to diagnostic command	172
6.2 Address Translation	173
6.2.1 Default parameters	173
6.2.2 Logical address	174
6.3 Power Save	175
6.3.1 Power save mode	175
6.3.2 Power commands	177
6.4 Defect Management	177
6.4.1 Spare area	178
6.4.2 Alternating defective sectors	178
6.5 Read-Ahead Cache	180
6.5.1 Data buffer configuration	180
6.5.2 Caching operation	181
6.5.3 Usage of read segment	182
6.6 Write Cache	187
Addresses	189
Reader Comment Form	190

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C141-E069-02EN

4 - 14

4.6.4

Time base generator circuit

The drive uses constant density recording to increase total capacity.

This is different from the

conventional method of recording data with a fixed data transfer rate at all data area.

In the

constant density recording method, data area is divided into zones by radius and the data

transfer rate is set so that the recording density of the inner cylinder of each zone is nearly

constant.

The drive divides data area into 15 zones to set the data transfer rate.

Table 4.2

describes the data transfer rate and recording density (BPI) of each zone.

Table 4.2

Write clock frequency and transfer rate of each zone

Zone

Cylinder

(except

MPD3130AT)

1174

1175

1760

1761

2047

2048

3600

3601

4208

4209

4830

4831

5448

5449

6630

Cylinder

(MPD3130AT)

1302

1303

1865

1866

2148

2149

3698

3699

4295

4296

4918

4919

5538

5539

6718

Transfer rate

[MB/s]

26.11

25.66

25.43

24.16

23.64

23.09

22.53

21.44

Zone

Cylinder

(except

MPD3130AT)

6631

7585

7586

8485

8486

9952

9953

10960

10961

11464

11465

12464

12465

13032

Cylinder

(MPD3130AT)

6719

7670

7671

8565

8566

10022

10023

11015

11016

11494

11495

12514

12515

13032

Transfer rate

[MB/s]

20.52

19.63

18.12

17.06

16.54

15.40

14.52

The MPU transfers the data transfer rate setup data (SDATA/SCLK) to the RDC that includes

the time base generator circuit to change the data transfer rate.

4.7

Servo Control

The actuator motor and the spindle motor are submitted to servo control.

The actuator motor

is controlled for moving and positioning the head to the track containing the desired data.

turn the disk at a constant velocity, the actuator motor is controlled according to the servo data

that is written on the data side beforehand.