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5.3 Host Commands
(21) READ DMA (X’C8’ or X’C9’)
The READ DMA command reads data from sectors, starting from the sectors
specified in the Device/Head, Cylinder High, Cylinder Low, and Sector Number
fields and continuing for as many sectors as specified in the Sector Count field. A
value ranging from 1 to 256 can be specified for the number of sectors. In order to
specify 256, "00" must be set in the Sector Count field. For the protocol
concerning data transfers, see Section 5.4.4.
When the command is completed, either cylinder, head, and sector addresses
(CHS mode) or the logical block address (LBA mode) of the last sector is stored in
the Shadow Block Register.
(1) A specified address exceeds the range where read operations are allowed
(ST = 51h, ER = 10h).
If an error such as an uncorrectable disk read error is detected during execution of
the READ DMA command and continued operation not possible, the data transfer
stops after all data, including the data of the sector where the error was detected, is
transferred. The device notifies the host of the status by sending the RegDH FIS.
At this time, the number of remaining sectors including the sector where the error
was detected, and either cylinder, head, and sector addresses (CHS mode) or the
logical block address (LBA mode) of the sector where the error was detected are
stored in the Shadow Block Register.
The host system can select the DMA transfer mode by using the SET FEATURES
command, however, the transfer speed does not change.
• Multiword DMA transfer mode 0 to 2
• Ultra DMA transfer mode 0 to 5
• Error reporting conditions
(2) The range where read operations are allowed will be exceeded by an address
during a read operation (ST = 51h, ER = 10h).
(3) An uncorrectable disk read error occurred (ST = 51h, ER = 40h).
(4) The sync byte indicating the beginning of a sector was not found
(ST = 51h, ER = 01h).
(5) A SATA communication error occurred (ST = 51h, ER = 0Ch).
(6) A Host Buffer CRC error occurred (ST = 51h, ER = 84h).
(7) An error other than the above errors occurred (ST = 51h, ER = 04h).
C141-E249 5-97
- FOR SAFE OPERATION 2
- Revision History 3
- Preface 5
- Operating Environment 6
- Conventions 6
- Attention 7
- Liability Exception 7
- Important Alert Items 9
- Manual Organization 11
- Contents 13
- Illustrations 19
- CHAPTER 1 Device Overview 23
- 1.1 Features 24
- 1.1.3 Interface 25
- 1.2 Device Specifications 26
- • + 5 V ± 5 % 28
- 1.5 Acoustic Noise 32
- 1.6 Shock and Vibration 32
- 1.7 Reliability 33
- 1.8 Error Rate 34
- 1.9 Media Defects 34
- 1.10 Load/Unload Function 34
- 2.1 Device Configuration 40
- 2.2 System Configuration 41
- 3.1 Dimensions 44
- •m (5kgf•cm) 45
- Mounting screw hole 49
- Cable connection 49
- 3.3.1 Device connector 51
- 4.1 Outline 56
- 4.2 Subassemblies 56
- 4.3 Circuit Configuration 57
- C141-E249 4-5 59
- 4.4 Power-on Sequence 60
- Power-on 61
- 4.5 Self-calibration 62
- 4.6 Read/write Circuit 64
- 4.6.3 Read circuit 65
- 4.6.4 Digital PLL circuit 66
- 4.7 Servo Control 67
- Diameter 70
- 4.7.3 Servo frame format 71
- Theory of Device Operation 72
- (2) Seek operation 72
- 4.7.5 Spindle motor control 73
- CHAPTER 5 Interface 75
- 5.1 Physical Interface 76
- COMRESET/COMINIT 78
- 106.7 ns 78
- 106.7 ns 106.7 ns 78
- 5.1.4 Connector pinouts 84
- 5.1.5 P11 function 85
- 5-12 C141-E249 86
- 5.1.6 Hot Plug 87
- 5.2 Logical Interface 88
- 5.2.1 Communication layers 89
- 5.3 Host Commands 103
- Interface 104
- 5-30 C141-E249 104
- 5.3.2 Command descriptions 106
- Word Value Content 162
- 5-88 C141-E249 162
- C141-E249 5-89 163
- 5.3 Host Commands 163
- C141-E249 5-91 165
- (23) READ BUFFER (X’E4’) 175
- (24) FLUSH CACHE (X’E7’) 176
- (25) WRITE BUFFER (X’E8’) 177
- Bit 0: Reserved 186
- Setup FIS 186
- × 2 minutes 190
- (28) SET FEATURES (X’EF’) 193
- → Low Power Idle 197
- 01h (*1) 198
- (36) SET MAX (X’F9’) 211
- • SET MAX ADDRESS 211
- • Description 217
- (38) READ DMA EXT (X’25’) 218
- Sector offset (7-0) 222
- (43) WRITE DMA EXT (X’35’) 228
- 5.3.3 Error posting 242
- 5.4 Command Protocol 245
- C141-E249 5-173 247
- • WRITE DMA (EXT) (FUA EXT) 250
- C141-E249 5-179 253
- 5-180 C141-E249 254
- C141-E249 5-181 255
- This page is intentionally 256
- blank 256
- CHAPTER 6 Operations 257
- 6.1 Reset and Diagnosis 258
- 6.1 Reset and Diagnosis 259
- earlier than the host) 259
- C141-E249 6-3 259
- 6.1.2 Response to COMRESET 260
- 6.2 Power Save 264
- 6.2.2 Power commands 266
- • READ SECTOR (s) (EXT) 269
- • READ MULTIPLE (EXT) 269
- • READ DMA (EXT) 269
- • READ FP DMA QUEUED 269
- 6.4.2 Caching operation 270
- 273
- Cache valid data 275
- START LBA 275
- LAST LBA 275
- 6.5 Write Cache 276
- IMPORTANT 277
- Glossary 279
- Acronyms and Abbreviations 283
- Comment Form 291
- DISK DRIVES PRODUCT MANUAL 293
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