Fujitsu MHT2020AT, MHT2030AT, MHT2040AT, MHT2060AT, MHT2080AT

5.3 Host Commands

C141-E192-01EN 5-59

(21) READ BUFFER (X’E4’)

The host system can read the current contents of the data buffer of the device by

issuing this command. Upon receipt of this command, the device sets the BSY bit

of Status register and sets up for a read operation. Then the device sets the DRQ

bit of Status register, clears the BSY bit, and generates an interrupt. After that,

the host system can read up to 512 bytes of data from the buffer.

At command issuance (I/O registers setting contents)

1F7H(CM)11110100

1F6H(DH) x x x DV xx

1F5H(CH)

1F4H(CL)

1F3H(SN)

1F2H(SC)

1F1H(FR)

At command completion (I/O registers contents to be read)

1F7H(ST) Status information

1F6H(DH) x x x DV xx

1F5H(CH)

1F4H(CL)

1F3H(SN)

1F2H(SC)

1F1H(ER)

Error information

Contents

Main FOR SAFE OPERATION Page Page Preface Overview of Manual Conventions for Alert Messages Operating Environment Conventions Page Page Important Alert Items Important Alert Messages Page Manual Organization Page Contents CHAPTER 2 Device Configuration................................................................ 2-1 CHAPTER 3 Installation Conditions..............................................................3-1 CHAPTER 4 Theory of Device Operation......................................................4-1 Page Page Page Illustrations Figures Page Tables CHAPTER 1 Device Overview 1.1 Features 1.1.1 Functions and performance 1.1.2 Adaptability 1.1.3 Interface Device Overview 1-4 C141-E192-01EN 1.2 Device Specifications 1.2.1 Specifications summary Table 1.1 shows the specifications of the disk drives (MHT Serie s). Table 1.1 Specifications (1/2) 1.2.2 Model and product number 1.3 Power Requirements Page Page 1.4 Environmental Specifications 1.5 Acoustic Noise 1.6 Shock and Vibration 1.7 Reliability 1.8 Error Rate 1.9 Media Defects 1.10Load/Unload Function 1.11Advanced Power Management Page Page Page 2.1 Device Configuration 2.2 System Configuration 2.2.1 ATA interface 2.2.2 1 drive connection 2.2.3 2 drives connection CHAPTER 3 Installation Conditions Page 3.2 Mounting Page Page Page Page Installation Conditions 3-8 C141-E192-01EN Figure 3.7 Handling cautions 3.3 Cable Connections 3.3.1 Device connector 3.3.2 Cable connector specifications 3.3.3 Device connection 3.4 Jumper Settings 3.4.2 Factory default setting 3.4.3 Master drive-slave drive setting 3.4.4 CSEL setting Page CHAPTER 4 Theory of Device Operation 4.1 Outline 4.2 Subassemblies 4.2.1 Disk 4.2.2 Spindle 4.2.3 Actuator 4.3 Circuit Configuration Page 4.3 Circuit Configuration DE Figure 4.2 Circuit Configurati on PCA C141-E192-01EN 4-5 4.4 Power-on Sequence 4.5 Self-calibration 4.5.1 Self-calibration contents 4.5.2 Execution timing of self-calibration 4.5.3 Command processing during self-calibration 4.6 Read/write Circuit 4.6.1 Read/write preamplifier (PreAMP) 4.6.2 Write circuit Page 4.6.3 Read circuit 4.6.4 Digital PLL circuit 4.7 Servo Control 4.7.1 Servo control circuit Page Page 4.7.2 Data-surface servo format !" # # Page 4.7.4 Actuator motor control 4.7.5 Spindle motor control Page Page CHAPTER 5 Interface 5-2 C141-E192-01EN 5.1 Physical Interface IDD 5.1.1 Interface signals Figure 5.1 shows the interface signals. Figure 5.1 Interface signals 5.1.2 Signal assignment on the connector Page Page 5.2 Logical Interface 5.2.1 I/O registers 5.2.2 Command block registers Page Page Page Page 5.2.3 Control block registers 5.3 Host Commands 5.3.1 Command code and parameters Page Page Page 5.3.2 Command descriptions Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page 5.3 Host Commands C141-E192-01EN 5-107 5.3.3 Error posting 5-108 C141-E192-01EN Table 5.21 Command code and parameters (2 of 2) 5.4 Command Protocol 5.4.1 PIO Data transferring commands from device to host Page 5.4.2 PIO Data transferring commands from host to device Page 5.4.3 Commands without data transfer Page 5.4.4 Other commands 5.4.5 DMA data transfer commands Page Page 5.5 Ultra DMA Feature Set 5.5.1 Overview 5.5.2 Phases of operation 5.5.3 Ultra DMA data in commands Page Page Page Page 5.5.4 Ultra DMA data out commands Page Page Page 5.5.5 Ultra DMA CRC rules 5.5.6 Series termination required for Ultra DMA 5.6 Timing 5.6.1 PIO data transfer 5.6.2 Multiword data transfer 5-132 C141-E192-01EN 5.6.3 Ultra DMA data transfer Page Page Page Page Page Page Page Page Page Page 5.6 Timing C141-E192-01EN 5-143 Page 5.6.4 Power-on and reset Page Page 6.1 Device Response to the Reset 6.1.1 Response to power-on 6.1.2 Response to hardware reset Page 6.1.3 Response to software reset 6.1.4 Response to diagnostic command 6.2 Power Save 6.2.1 Power save mode Page 6.2.2 Power commands 6.3 Defect Processing 6.3.1 Spare area 6.3.2 Alternating processing for defective sectors Page 6.4 Read-ahead Cache 6.4.1 DATA buffer structure 6.4.2 Caching operation Page Page Page Page Page 6.5 Write Cache 6.5.1 Cache operation Page Page Page Glossary Page Page Page Acronyms and Abbreviations Page Index Page Comment Form

Fujitsu - page 133

Models: MHT2020AT MHT2030AT MHT2040AT MHT2060AT MHT2080AT