IBM DTCA-24090 Hard Drive Specifications - Page 149

In CHS mode, this register contains max sector number= 63. L=0

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Sector Number In LBA mode, this register contains LBA bits 0 - 7 which is to be input.(L=1) In CHS mode, this register is ignored. ( L = 0 ) Cylinder High/Low In LBA mode, this register contains LBA bits 8 - 15 (Low), 16 - 23 (High) which is to be set. ( L = 1 ) In CHS mode, this register contains cylinder number which is to be input.(L=0) H In LBA mode, this register contains LBA bits 24 - 27 which is to be input.(L=1) In CHS mode, this register is ignored. ( L = 0 ) L LBA mode.Indicates the addressing mode.L=0 specifies CHS mode and L = 1 does LBA addressing mode. D The device number bit. Indicates that the device number bit of the Device/Head should be specified. D = 0 selects the master device and D = 1 selects the slave device. V Valid. Indicates that the bit is part of an output parameter and should be specified. - Indicates that the bit is not used. Input Parameters From The Device Sector Number In LBA mode, this register contains Adjusted max LBA bits 0 - 7.(L=1) In CHS mode, this register contains max sector number(= 63). ( L = 0 ) Cylinder High/Low In LBA mode, this register contains Adjusted max LBA bits 8 - 15 (Low), 16 - 23 (High). ( L = 1 ) In CHS mode, this register contains max cylinder number which is set. ( L = 0 ) H In LBA mode, this register contains Adjusted max LBA bits 24 - 27. ( L = 1 ) In CHS mode, this register contains max head number(= 15).(L=0) V Valid. Indicates that the bit is part of an input parameter and will be set to 0 or 1 by the device. - Indicates that the bit is not used. Command Descriptions 141

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Sector Number
In LBA mode, this register contains LBA bits
0 - 7 which is to be input.(L=1)
In CHS mode, this register is ignored. (L=0)
Cylinder High/Low
In LBA mode, this register contains LBA bits
8 - 15 (Low),
16 - 23 (High) which is to be set. (L=1)
In CHS mode, this register contains cylinder number which is to be input.(L=0)
H
In LBA mode, this register contains LBA bits
24 - 27 which is to be input.(L=1)
In CHS mode, this register is ignored. (L=0)
L
LBA mode.Indicates the addressing mode.L=0 specifies CHS mode and L=1 does
LBA addressing mode.
D
The device number bit.
Indicates that the device number bit of the Device/Head
should be specified.
D = 0 selects the master device and D = 1 selects the slave device.
V
Valid.
Indicates that the bit is part of an output parameter and should be specified.
-
Indicates that the bit is not used.
Input Parameters From The Device
Sector Number
In LBA mode, this register contains Adjusted max LBA bits 0 - 7.(L=1)
In CHS mode, this register contains max sector number(= 63). (L=0)
Cylinder High/Low
In LBA mode, this register contains Adjusted max LBA bits
8 - 15 (Low),
16 - 23 (High). (L=1)
In CHS mode, this register contains max cylinder number which is set. (L=0)
H
In LBA mode, this register contains Adjusted max LBA bits
24 - 27. (L=1)
In CHS mode, this register contains max head number(= 15).(L=0)
V
Valid.
Indicates that the bit is part of an input parameter and will be set to 0 or 1 by
the device.
-
Indicates that the bit is not used.
Command Descriptions
141