User manual

Hitachi hard disk drive specifications
247
Output Parameters To The Device
Feature Current
URG (bit7)
URG specifies an urgent transfer request. The Urgent bit specifies that the
command should be completed in the minimum possible time by the device and
shall be completed within the specified Command Completion Time Limit.
WC (bit6)
WC specifies Write Continuous mode enabled. If the Write Continuous bit is set
to one, the device shall not stop execution of the command due to errors.
If the WC bit is set to one and errors occur in transfer or writing of the data, the
device shall continue to transfer the amount of data requested and then provide
ending status with BSY bit cleared to zero, the SE bit set to one, the ERR bit
cleared to zero, and the type of error, ICRC, IDNF or ABRT reported in the error
log.
If the WC 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 the
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 even if some data transferred is in
error.
F (bit5)
F specifies that all data for the specified stream shall be flushed to the media
before command complete is reported when set to one.
HSE (bit4)
HSE (Handle Stream Error) specifies that this command starts at the LBA of the
last reported error for this stream, so the device may attempt to continue its
corresponding error recovery sequence where it left off earlier.
Stream ID (bit 0..2)
Stream ID specifies the stream being written. The device shall operate
according to the Stream ID set by the Write Stream command.
Feature Previous
CCTL (7:0)
The time allowed for the current command's completion is calculated as follows:
Command Completion Time Limit = (content of the Feature register
Previous) * (Identify Device words (99:98)) useconds
If the value is zero, the device shall use the Default CCTL supplied with a previous
Configure Stream command for this Stream ID. If the Default CCTL is zero, or
no previous Configure Stream command was defined for this Stream ID, the
device will ignore the CCTL. The time is measured from the write of the
command register to the final INTRQ for command completion. The device has
minimum CCTL value. When the specified value is shorter than the minimum
value, CCTL is set to the minimum value. Actual minimum CCTL value is
described in the “Deviations from Standard” section.
Sector Count Current
The number of continuous sectors to be transferred low order, bits (7:0)
Sector Count Previous
The number of continuous sectors to be transferred high order, bits (15:8). If
zero is specified in the Sector Count register, then 65,536 sectors will be
transferred.
Sector Number Current
LBA (7:0).
Sector Number Previous
LBA (31:24).
Cylinder Low Current
LBA (15:8).
Cylinder Low Previous
LBA (39:32).
Cylinder High Current
LBA (23:16).
Cylinder High Previous
LBA (47:40).
Input Parameters From The Device
Sector Number (HOB=0)
LBA (7:0) of the address of the first unrecoverable error.