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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 SSD with extended power as they require Power Level 1 to perform their full set of functions.
Power Enhanced SSD are required to power up and execute all supported commands and protocols in Power
Level 0, their default feature shall be 8Ah: Disable Power Level 1 Commands. No commands are actually
excluded for such cards in Power Level 0 because no commands require Power Level 1.
Features 55h and BBh are the default features for the SSD; 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.
8.28 Set max address (F9h)
The Set max address command sets the max address of the drive. It is related to the Host protected Area
feature set. Table 71 defines the Set max address command Byte sequence.
Table 71: Read native max address
Task File Register
7
6
5
4
3
2
1
0
COMMAND
F8h
DRIVE/HEAD
nu
LBA
nu
D
Set max LBA (27:24)
CYLINDER HI
CYLINDER LOW
SECTOR NUM
Set max LBA (23:16)
Set max LBA (15:8)
Set max LBA (7:0)
SECTOR COUNT
FEATURES
nu
nu
VV
The LBA bit shall be set to one to specify the address is an LBA. DEV shall specify the selected device.
VV =Value volatile. If bit 0 is set to one, the device shall preserve the maximum values over power-up or
hardware reset. If bit 0 is cleared to zero, the device shall revert to the most recent nonvolatile maximum
address value setting over power-up or hardware reset.
Typical use of the Set max address (F9h) and Read native max address (F8h) commands would be:
On reset
BIOS receives control after a system reset;
1.
2.
BIOS issues a READ NATIVE MAX ADDRESS command to find the max capacity of the device;
BIOS issues a SET MAX ADDRESS command to the values returned by READ NATIVE MAX ADDRESS;
3. BIOS reads configuration data from the highest area on the disk;
4. BIOS issues a READ NATIVE MAX ADDRESS command followed by a SET MAX ADDRESS command to reset
the device to the size of the file system.
On save to disk
1.
2.
BIOS receives control prior to shut down;
BIOS issues a READ NATIVE MAX ADDRESS command to find the max capacity of the device;
3. BIOS issues a volatile SET MAX ADDRESS command to the values returned by READ NATIVE MAX
ADDRESS;
4. Memory is copied to the reserved area;
5. Shut down completes;
6. On power-on or hardware reset the device max address returns to the last non-volatile setting.
These commands are intended for use only by system BIOS or other low-level boot time process.
Swissbit AG
Industriestrasse 4
Swissbit reserves the right to change products or specifications without notice.
Revision: 1.00
CH-9552 Bronschhofen
Switzerland
www.swissbit.com
industrial@swissbit.com
P-120_data_sheet_PA-QxBO_Rev100.doc
Page 56 of 76
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