IBM DJSA-210 Hard Drive Specifications - Page 144

Read Long 22h/23h, This indicates the sector number of the sector to be transferred. L = 0 In LBA

Get IBM DJSA-210 - Travelstar 10 GB Hard Drive PDF manuals and user guides View all IBM DJSA-210 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 144 highlights

13.14 Read Long (22h/23h) Command Block Output Registers Register 7 6 5 4 3 2 1 0 Data Feature Sector Count 0 0 0 0 0 0 0 1 Sector Number V V V V V V V V Cylinder Low V V V V V V V V Cylinder High V V V V V V V V Device/Head 1 L 1 D H H H H Command 0 0 1 0 0 0 1 R Command Block Input Registers Register 7 6 5 4 3 2 1 0 Data Error see below Sector Count V Sector Number V V V V V V V V Cylinder Low V V V V V V V V Cylinder High V V V V V V V V Device/Head - - - - H H H H Status see below Error Register 76543210 CRC UNC 0 IDN 0 ABT T0N AMN 000V0V0V Status Register 7 6 5 4 3 2 10 BSY RDY DF DSC DRQ COR IDX ERR 0 V 0 V - 0 -V Figure 87. Read Long command (22h/23h) The Read Long command reads the designated one sector of data and the ECC bytes from the disk media. It then transfers the data and ECC bytes from the device to the host. After 512 bytes of data have been transferred, the device will keep setting DRQ = 1 to indicate that the device is ready to transfer the ECC bytes to the host. The data is transferred 16 bits at a time and the ECC bytes are transferred 8 bits at a time. The number of ECC bytes are 4 or 40 according to the setting of Set Feature option. The default setting is 4 bytes of ECC data. The command makes a single attempt to read the data and does not check the data using ECC. Whatever is read is returned to the host. Output Parameters To The Device Sector Count This indicates the number of continuous sectors to be transferred. The Sector Count must be set to one. Sector Number This indicates the sector number of the sector to be transferred. (L = 0) In LBA mode, this register contains LBA bits 0-7. (L = 1) Cylinder High/Low This indicates the cylinder number of the sector to be transferred. (L = 0) In LBA mode, this register contains LBA bits 8-15 (Low), 16-23 (High). (L = 1) H This indicates the head number of the sector to be transferred. (L = 0) In LBA mode, this register contains LBA bits 24-27. (L = 1) Travelstar 32GH/30GT/20GN hard disk drive specifications 130

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
  • 187
  • 188
  • 189
  • 190
  • 191
  • 192
  • 193
  • 194
  • 195
  • 196
  • 197
  • 198
  • 199
  • 200
  • 201
  • 202
  • 203
  • 204
  • 205
  • 206
  • 207
  • 208
  • 209
  • 210
  • 211
13.14 Read Long (22h/23h)
see below
Status
0 0 1 0 0 0 1 R
Command
– – – – H H H H
Device/Head
1 L 1 D H H H H
Device/Head
V V V V V V V V
Cylinder High
V V V V V V V V
Cylinder High
V V V V V V V V
Cylinder Low
V V V V V V V V
Cylinder Low
V V V V V V V V
Sector Number
V V V V V V V V
Sector Number
– – – – – – – V
Sector Count
0 0 0 0 0 0 0 1
Sector Count
see below
Error
– – – – – – – –
Feature
– – – – – – – –
Data
– – – – – – – –
Data
7 6 5 4 3 2 1 0
Register
7 6 5 4 3 2 1 0
Register
Command Block Input Registers
Command Block Output Registers
V
–
0
–
V
0
V
0
V
0
V
0
V
0
0
0
ERR
IDX
COR
DRQ
DSC
DF
RDY
BSY
AMN
T0N
ABT
0
IDN
0
UNC
CRC
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Status Register
Error Register
Figure 87. Read Long command (22h/23h)
The Read Long command reads the designated one sector of data and the ECC bytes from the disk
media. It then transfers the data and ECC bytes from the device to the host.
After 512 bytes of data have been transferred, the device will keep setting DRQ = 1 to indicate that the
device is ready to transfer the ECC bytes to the host. The data is transferred 16 bits at a time and the
ECC bytes are transferred 8 bits at a time. The number of ECC bytes are 4 or 40 according to the setting
of Set Feature option. The default setting is 4 bytes of ECC data.
The command makes a single attempt to read the data and does not check the data using ECC. Whatever
is read is returned to the host.
Output Parameters To The Device
Sector Count
This indicates the number of continuous sectors to be transferred. The Sector
Count must be set to one.
Sector Number
This indicates the sector number of the sector to be transferred. (L = 0) In LBA
mode, this register contains LBA bits 0–7. (L = 1)
Cylinder High/Low
This indicates the cylinder number of the sector to be transferred. (L = 0) In LBA
mode, this register contains LBA bits 8–15 (Low), 16–23 (High). (L = 1)
H
This indicates the head number of the sector to be transferred. (L = 0) In LBA
mode, this register contains LBA bits 24–27. (L = 1)
Travelstar 32GH/30GT/20GN hard disk drive specifications
130