Western Digital Ultrastar DC HC310 - Page 171

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Western Digital Hard Disk Drive OEM Specification
Output Parameters To The Device
Feature Current
Subcommand (bits 3-0)
When bits (3:0) is 1h, Deadline Handling Subcommand.
WDNC(bits 4)
If the WDNC (Write Data Not Continue) bit is cleared to zero, then the device allows
WRITE FPDMA QUEUED command completion times to exceed what the ICC
parameter specified. If the WDNC bit is set to one, then the all WRITE FPDMA
QUEUED commands are completed by the time specified by the ICC timer value,
otherwise the device returns command aborted for all outstanding commands.
WDNC is only applicable to WRITE FPDMA QUEUED commands with PRIO is set
to 01b (Isochronous – deadline dependent priority)
RDNC(bits 5)
If the RDNC (Read Data Not Continue) bit is cleared to zero, then the device allows
READ FPDMA QUEUED command completion times to exceed what the ICC
parameter specified. If the RDNC bit is set to one, then the all READ FPDMA
QUEUED commands are completed by the time specified by the ICC timer value,
otherwise the device returns command aborted for all outstanding commands.
RDNC is only applicable to READ FPDMA QUEUED commands with PRIO is set to
01b (Isochronous – deadline dependent priority)
Feature Previous
Sector Count Current
TAG (bits 7-3)
The TAG value is assigned to be different from all other queued commands. The
value does not exceed the maximum queue depth specified by the Word 75 of the
Identify Device information.
Sector Count Previous
Sector Number Current
Cylinder Low Current
Cylinder Low Previous
Cylinder High Current
Cylinder High Previous
Device/Head
Input Parameters From The Device
Sector Number (HOB=0)
Sector Number (HOB=1)
Cylinder Low (HOB=0)
Cylinder Low (HOB=1)
Cylinder High (HOB=0)
Cylinder High (HOB=1)