11.21 Read Multiple Ext (29h)
...See Below...Status
0 0 1 0 1 0 0 1
Command
- - - - - - - -
Device/Head
- 1 - D - - - -
Device/Head
V V V V V V V
HOB=1
V V V V V V V
Previous
V V V V V V V
HOB=0
Cylin-
der
High
V V V V V V V
CurrentCylin-
der
High
V V V V V V V
HOB=1
V V V V V V V
Previous
V V V V V V V V
HOB=0
Cylin-
der
Low
V V V V V V V V
CurrentCylin-
der
Low
V V V V V V V V
HOB=1
V V V V V V V VPrevious
V V V V V V V V
HOB=0
Sector
Number
V V V V V V V V
Current
Sector
Number
- - - - - - - -
HOB=1
V V V V V V V
Previous
- - - - - - - -
HOB=0
Sector
Count
V V V V V V V
Current
Sector
Count
- - - - - - - -
Previous
...See Below...Error
- - - - - - - -Current
Fea-
ture
- - - - - - - -
Data High
- - - - - - - -
Data High
- - - - - - - -
Data Low
- - - - - - - -
Data Low
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–V0V0V0V0V0V0
ERRIDXCORDRQDSCDFRDYBSYAMNT0NABT0IDN0UNCCRC
0123456701234567
Status RegisterError Register
Figure 127. Read Multiple Ext (29h)
The Read Multiple Ext command reads one or more sectors of data from disk media, then transfers the
data from the device to the host.
The sectors are transferred through the Data Register 16 bits at a time. Command execution is identical
to the Read Sector(s) command except that an interrupt is generated for each block (as defined by the
Set Multiple command) instead of for each sector.
Deskstar 180GXP hard disk drive specifications
151
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