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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 "Reset Response Table" on
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.
(*2)
Default value on POR is shown in "Default Register Values" on
(*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.
(*6)
See 5.15 Software Setting Preservation feature.
Figure 5 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.
Register
Error
Sector Count
LBA Low
LBA Mid
LBA High
Device
Status
Travelstar 5K160 (SATA) Hard Disk Drive Specification
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 5
POR
-
-
O
O
(*5)
O
O
(*5)
o
Default Value
Diagnostic Code
01h
01h
00h
00h
00h
50h
48/167
COMRESET
Soft Reset
o
o
(*1)
(*1)
x
x
x
x
x
x
o
o
(*6)
(*3)
(*4)
(*4)
o
x
Page
5.
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