Pio Data Out Commands; Command Protocol; Pio Data In Commands - Hitachi HDS723020BLA642 Specifications

Command Protocol

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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 1.0a (Section 9. device command layer protocol) and Serial ATA II:
Extensions to Serial ATA 1.0a (Section 4. Command layer) 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.
The device timeout values are described in the Section12 on the page 263.

10.1 PIO Data In commands

These commands are:

Device Configuration Identify

Identify Device

Read Buffer

Read Log Ext

Read Multiple

Read Multiple Ext

Read Sector(s)

Read Sector(s) Ext

Read Stream PIO

SMART Read Attribute Values

SMART Read Attribute Thresholds

SMART Read Log Sector
Execution includes the transfer of one or more 512 byte sectors of data from the device to the host.

10.2 PIO Data Out commands

These commands are:

Device Configuration Set

Download Microcode

Format Track

Security Disable Password

Security Erase Unit

Security Set Password

Security Unlock

Set Max Set Password command

Set Max Unlock command
Hitachi hard disk drive specifications
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