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5K320 SATA OEM Specification
137
14.35 Set Features (EFh)
Command Block Output Registers Command Block Input Registers
Register 7 6 5 4 3 2 1 0 Register 7 6 5 4 3 2 1 0
Data - - - - - - - - Data - - - - - - - -
Feature V V V V V V V V Error ...See Below...
Sector Count Note.1 Sector Count - - - - - - - -
LBA Low - - - - - - - - LBA Low - - - - - - - -
LBA Mid - - - - - - - - LBA Mid - - - - - - - -
LBA High - - - - - - - - LBA High - - - - - - - -
Device - - - - - - - - Device - - - - - - - -
Command 1 1 1 0 1 1 1 1 Status ...See Below...
Error Register Status Register
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
CRC UNC 0 IDN 0 ABT T0N AM
N
BSY RDY DF DSC DRQ COR IDX ERR
0 0 0 0 0 V 0 0 0 V 0 - - 0 0 V
Table 105 Set Features Command (EFh)
The Set Feature command is to establish the following parameters which affect the execution of
certain features as shown in below table.
ABT will be set to 1 in the Error Register if the Feature register contains any undefined values.
After power on reset, the device is set to the following features as default.
Write cache : Enable
ECC bytes : 4 bytes
Read look-ahead : Enable
Reverting to power on defaults : Disable
Device-initiated interface power state
transition
: Disable
Software setting preservation : Enable
Output Parameters To The Device
Feature
Destination code for this command
02H
Enable write cache (Note.2)
03H
Set transfer mode based on value in sector count register
05H
Enable Advanced Power Management
06H
Enable Power-Up in Standby feature set
07H
Power-Up in Standby feature set device spin-up
10H
Enable use of Serial ATA feature
55H
Disable read look-ahead feature
66H
Disable reverting to power on defaults
82H
Disable write cache
85H
Disable Advanced Power Management (Note.3)
86H
Disable Power-UP in Standby feature set
90H
Disable use of Serial ATA feature
AAH
Enable read look-ahead feature
CCH
Enable reverting to power on defaults
Note 1.