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12 General Operation Descriptions
12.1 Reset Response
There are three types of reset in ATA as follows:
Power On Reset (POR)
COMRESET
Soft Reset (Software Reset)
The actions of each reset are shown in "Table 29 Reset Response Table"
Aborting Host interface
Aborting Device operation
Initialization of hardware
Internal diagnostic
Starting spindle motor
Initialization of registers (*2)
Reverting programmed parameters to default
- Number of CHS (set by Initialize Device Parameter)
- Multiple mode
- Write cache
- Read look-ahead
- ECC bytes
- Volatile max address
Power mode
Reset Standby timer value
O ---- execute
X ---- not execute
Note.
(*1)
Execute after the data in write cache has been written.
Default value on POR is shown in "Table 30 Default Register Values" on Page 49.
(*2)
(*3)
The Set Features command with Feature register = CCh enables the device to
revert these parameters to the power on defaults.
(*4)
In the case of sleep mode, the device goes to standby mode. In other case,
the device does not change current mode.
(*5)
According to the initial power mode selection.
See 12.15 Software Setting Preservation Feature Set.
(*6)
Table 29 Reset Response Table
Register Initialization
12.1.1
After power on, COMRESET, or software reset, the register values are initialized as shown in the following table.
The device executes a series of electrical circuitry diagnostics, spins up the HDA,
tests speed and other mechanical parametric, and sets default values.
COMRESET is issued in Serial ATA bus.
The device resets the interface circuitry as well as Soft Reset.
SRST bit in the Device Control Register is set, then is reset.
The device resets the interface circuitry according to the Set Features requirement.
Page 48 of 171
5K250 (SATA) OEM Specification
POR
COMRESET
-
o
-
(*1)
O
x
O
x
(*5)
x
O
o
O
(*6)
(*5)
(*4)
o
o
Soft Reset
o
(*1)
x
x
x
o
(*3)
(*4)
x
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