Table of Contents
Advertisement
10.26 Read Stream DMA (2Ah)
Command Block Output Registers
Register
7
Data Low
-
Data High
-
Current
V
Feature
Previous
V
Current
V
Sector Count
Previous
V
Current
V
Sector
Number
Previous
V
Current
V
Cylinder Low
Previous
V
Current
V
Cylinder High
Previous
V
Device/Head
1
Command
0
Error Register
7
6
5
4
CRC
UNC
0
IDN
V
V
0
V
Table 135 Read Stream DMA Command (2Ah)
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 to one. 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 provide 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
HITACHI Deskstar & CinemaStar P7K500 Hard Disk Drive specification (Rev 1.1)
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
1
1
D
-
-
-
-
0
1
0
1
0
1
0
3
2
1
0
CCT
0
ABT
T0N
O
0
V
0
V
179
Command Block Input Registers
Register
7
Data Low
-
Data High
-
Error
HOB=0
-
Sector Count
HOB=1
-
HOB=0
V
Sector
Number
HOB=1
V
HOB=0
V
Cylinder Low
HOB=1
V
HOB=0
V
Cylinder High
HOB=1
V
Device/Head
-
Status
Status Register
7
6
5
4
BSY
RDY
SE
DWE DRQ COR
0
V
V
0
6
5
4
3
2
1
0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
...See Below...
-
-
-
-
-
-
-
-
-
-
-
-
-
-
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
-
-
-
-
-
-
-
...See Below...
3
2
1
0
IDX
ERR
-
0
-
V
- Quick Links:
- Data Sheet
- Jumper Settings(Pata Model)
Hide quick links:
Advertisement
Table of Contents
