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IDE Solid State Disk
Minimum power consumption with Standby
Reserved
Reserved
Device performance may increase with increasing power management levels. Device power consumption may
increase with increasing power management levels. The power management levels may contain discrete bands. For
example, a device may implement one power management method from 80h to A0h and a higher performance, higher
power consumption method from level A1h to FEh. Advanced power management levels 80h and higher do not permit
the device to spin down to save power.
Feature 85h disables Advanced Power Management. Subcommand 85h may not be implemented on all devices that
implement Set Features subcommand 05h.
Features 0Ah and 8Ah are used to enable and disable Power Level 1 commands. Feature 0Ah is the default feature for
the device with extended power.
Features 55h and BBh are the default features for the device; thus, the host does not have to issue this command with
these features unless it is necessary for compatibility reasons.
Feature code 9Ah enables the host to configure the card to best meet the host system's power requirements. The host
sets a value in the Sector Count register that is equal to one-fourth of the desired maximum average current (in mA)
that the card should consume. For example, if the Sector Count register were set to 6, the card would be configured to
provide the best possible performance without exceeding 24 mA. Upon completion of the command, the card responds
to the host with the range of values supported by the card. The minimum value is set in the Cylinder Low register, and
the maximum value is set in the Cylinder Hi register. The default value, after a power on reset, is to operate at the
highest performance and therefore the highest current mode. The card shall accept values outside this programmable
range, but shall operate at either the lowest power or highest performance as appropriate.
Features 66h and CCh can be used to enable and disable whether the Power On Reset (POR) Defaults shall be set
when a soft reset occurs. The default setting is to revert to the POR defaults when a soft reset occurs.
(14) Set Multiple Mode - C6h
Bit ->
7
Command (7)
C/D/H (6)
Cyl High (5)
Cyl Low (4)
Sec Num (3)
Sec Cnt (2)
Feature (1)
This command enables the device to perform Read and Write Multiple operations and establishes the block count for
these commands. The Sector Count Register is loaded with the number of sectors per block. Upon receipt of the
command, the device sets BSY to 1 and checks the Sector Count Register.
If the Sector Count Register contains a valid value and the block count is supported, the value is loaded and execution
is enabled for all subsequent Read Multiple and Write Multiple commands.
If the block count is not supported, an Aborted Command error is posted and the Read Multiple and Write Multiple
commands are disabled. If the Sector Count Register contains 0 when the command is issued, Read and Write
Multiple commands are disabled. At power on, or after a hardware or (unless disabled by a Set Feature command)
software reset, the default mode is Read and Write Multiple disabled.
Rev. A.6
Level
6
5
X
Set Multiple Mode
Sector Count Value
4
3
C6h
Drive
X
X
X
Sector Count
X
24/32
01h
FFh
00h
2
1
X
Nov. 2008
0
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