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Using these commands outside BIOS controlled boot or shutdown may result in damage to file systems on
the device. Devices should return command aborted if a subsequent non-volatile SET MAX ADDRESS
command is received after a power-on or hardware reset.
8.29 Set Multiple Mode (C6h)
This command enables the Drive 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 Drive sets BSY 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 for
all subsequent Read Multiple and Write Multiple commands and execution is enabled. If a block count is
not supported, an Aborted Command error is posted, and 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 the default mode is Read and Write Multiple disabled, unless it is
disabled by a Set Feature command. Table 72 defines the Set Multiple Mode command Byte sequence.
Table 72: Set Multiple Mode
Task File Register
7
6
5
4
3
2
1
0
COMMAND
C6h
DRIVE/HEAD
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
nu
D
nu
nu
nu
Sector Count
nu
nu
8.30 Set Sleep Mode (99h or E6h)
This command causes the Drive to set BSY, enter the Sleep mode, clear BSY and generate an interrupt.
Recovery from sleep mode is accomplished by simply issuing another command. Sleep mode is also entered
when internal timers expire so the host does not need to issue this command except when it wishes to
enter Sleep mode immediately. The default value for the timer is 5 milliseconds. Note that this time base
(5ms) is different from the ATA Specification. Table 73 defines the Set Sleep Mode command Byte sequence.
Table 73: Set Sleep Mode
Task File Register
7
6
5
4
3
2
1
0
COMMAND
99h or E6h
DRIVE/HEAD
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
nu
D
nu
nu
nu
nu
nu
nu
8.31 S.M.A.R.T. (B0h)
The intent of self-monitoring, analysis, and reporting technology (the SMART feature set) is to protect user
data and minimize the likelihood of unscheduled system downtime that may be caused by predictable
degradation and/or fault of the device. By monitoring and storing critical performance and calibration
parameters, SMART feature set devices attempt to predict the likelihood of near-term degradation or fault
condition. Providing the host system the knowledge of a negative reliability condition allows the host system
to warn the user of the impending risk of a data loss and advise the user of appropriate action. Support of this
feature set is indicated in the IDENTIFY DEVICE data (Word 82 bit 0).
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 57 of 76
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