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Read Stream Pio (2Bh) - Hitachi T7K250 - Deskstar - Hard Drive Specifications

3.5 inch ultra ata/133 hard disk drive, 3.5 inch serial ata hard disk drive
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12.27 Read Stream PIO (2Bh)

Command Block Output Registers
Register
Data Low
Data High
Current
Feature
Previous
Current
Sector
Count
Previous
Current
Sector
Number
Previous
Current
Cylinder
Low
Previous
Cylinder
Current
Previous
High
Device/Head
Command
7
6
5
CRC UNC
0
V
V
0
The Read Stream DMA command reads one to 65536 sectors as specified in the Sector Count register. A value of
0000h in the Sector Count register requests 65536 sectors.
The RC bit indicates that the drive operate in a continuous read mode for the Read Stream command. When RC is
cleared to zero the drive shall operate in normal Streaming read mode.
When the Read Continuous mode is enabled, the device shall transfer data of the requested length without setting
the ERR bit. The SE bit shall be set to one if the data transferred includes errors. The data may be erroneous in this
case.
If the Read Continuous bit is set to one, the device shall not stop execution of the command due to errors. If the RC
bit is set to one and errors occur in reading or transfer of the data, the device shall continue to transfer the amount
of data requested and then provide ending status with the BSY bit cleared to zero, the SE bit set to one, the ERR bit
cleared to zero, and the type of error, ICRC,UNC,IDNF, or ABRT, reported in the error log. If the RC bit is set to
one and the Command Completion Time Limit expires, the device shall stop execution of the command and pro-
vide ending status with BSY bit cleared to zero, the SE bit set to one, the ERR bit cleared to zero, and report the
fact that the Command Completion Time Limit expired by setting the CCTO bit in the error log to one, In all cases,
the device shall attempt to transfer the amount of data requested within the Command Completion Time Limit
event if some data transferred is in error.
Output parameters to the device
Feature Current
7 6 5 4 3 2 1 0
- - - - - - - -
- - - - - - - -
V V V V - V V V
V V V V V V V V
V V V V V V V V
V V V V V V V V
V V V V V V V V
V V V V V V V V
V V V V V V V V
V V V V V V V V
V V V V V V V V
V V V V V V V V
1 1 1 D - - - -
0 0 1 0 1 0 1 1
Error Register
4
3
2
1
IDN
0
ABT T0N AMN
V
0
V
0
Deskstar T7K250 Hard Disk Drive Specification
Command Block Input Registers
Register
Data Low
Data High
Error
Sector
Count
Sector
Number
Cylinder
Low
Cylinder
High
Device/Head
Status
0
7
6
BSY RDY DF DSC DRQ
V
0
V
170
7 6 5 4 3 2 1 0
- - - - - - - -
- - - - - - - -
see below
HOB=0
- - - - - - - -
HOB=1
- - - - - - - -
HOB=0
V V V V V V V V
HOB=1
V V V V V V V V
HOB=0
V V V V V V V V
HOB=1
V V V V V V V V
HOB=0
V V V V V V V V
HOB=1
V V V V V V V V
- - - - - - - -
See below ...
Status Register
5
4
3
2
COR IDX
V
V
-
0
1
0
ERR
-
V
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