7K200 SATA OEM Specification

12.17SMART Command Transport (SCT)

SMART Command Transport (SCT) feature set is supported. The SMART Read Log and SMART Write Log commands or Read Log Ext and Write Log Ext commands are used to issue a command in this feature sets. Log page E0h is used to issue commands and return status. Log page E1h is used to transport data. Please refer to the section 8 SCT Command Transport in ATA8-ACS specification for more detail.

The following Action codes are supported.

Action

code

0002h

0003h

0004h

0005h

Description

Write Same command

Error Recovery Control command

Feature Control command

Feature code

Write Cache

0001h

 

 

 

Feature code

Time Interval for temperature logging

0003h

 

 

 

SCT Data Table command

Table 39 SCT Action Code Supported

13 Command Protocol

The commands are grouped into different classes according to the protocols followed for command execution. The command classes with their associated protocols are defined below.

Please refer to Serial ATA Revision 2.6 (Section 11. device command layer protocol) about each protocol.

For all commands, the host must first check if BSY=1, and should proceed no further unless and until BSY=0. For all commands, the host must also wait for RDY=1 before proceeding.

A device must maintain either BSY=1 or DRQ=1 at all times until the command is completed. The INTRQ signal is used by the device to signal most, but not all, times when the BSY bit is changed from 1 to 0 during command execution.

A command shall only be interrupted with a COMRESET or software reset. The result of writing to the Command register while BSY=1 or DRQ=1 is unpredictable and may result in data corruption. A command should only be interrupted by a reset at times when the host thinks there may be a problem, such as a device that is no longer responding.

Interrupts are cleared when the host reads the Status Register, issues a reset, or writes to the Command Register.

“Table 138 Timeout Values” on Page 171 shows the device timeout values.

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Hitachi HDS723020BLA642 manual Command Protocol, Smart Command Transport SCT, SCT Action Code Supported
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HDS723020BLA642 specifications

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