Travelstar 5K160 (PATA) Hard Disk Drive Specification
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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)
The device executes a series of electrical circuitry diagnostics, spins up the HDA,
tests speed and other mechanical parametric, and sets default values.
Hard Reset (Hardware Reset)
RESET- signal is negated in ATA Bus.
The device resets the interface circuitry and sets default values.
Soft Reset (Software 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.
The actions of each reset are shown in "Figure 23 Reset Response Table" on page 62
POR Hard
Reset
Soft
Reset
Aborting Host interface
-
o
o
Aborting Device operation
-
(*1)
(*1)
Initialization of hardware
O
x
x
Internal diagnostic
O
x
x
Starting spindle motor
(*5)
x
x
Initialization of registers (*2)
O
o
o
DASP handshake
O
o
x
PDIAG handshake
O
o
o
Reverting programmed parameters to default
O
o
(*3)
- Number of CHS (set by Initialize Device Parameter)
- Multiple mode
- Write cache
- Read look-ahead
- ECC bytes
- Volatile max address
- Address offset mode
Power mode
(*5) (*4) (*4)
Reset Standby timer value (*5)
o
o
x
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 "
Figure 24 Default Register Values
" on page 63.
(*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.
Figure 23 Reset Response Table
