12 General Operation Descriptions; Reset Response; Figure 23 Reset Response Table - Hitachi HTS541616J9AT00 - Travelstar 160 GB Hard Drive Specifications

12 General Operation Descriptions

12.1

Reset Response

There are three types of reset in ATA as follows:
Power On Reset (POR)
Hard Reset (Hardware Reset) RESET- signal is negated in ATA Bus.
Soft Reset (Software Reset)
The actions of each reset are shown in "Figure 23 Reset Response Table" on page 62
Aborting Host interface
Aborting Device operation
Initialization of hardware
Internal diagnostic
Starting spindle motor
Initialization of registers (*2)
DASP handshake
PDIAG handshake
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
- Address offset mode
Power mode
Reset Standby timer value (*5)
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

Travelstar 5K160 (PATA) 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.
The device resets the interface circuitry and sets default values.
SRST bit in the Device Control Register is set, then is reset.
The device resets the interface circuitry according to the Set Features requirement.
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POR Hard Soft
Reset Reset
- o o
- (*1) (*1)
O x x
O x x
(*5) x x
O o o
O o x
O o o
O o (*3)
(*5) (*4) (*4)
o o x
O ---- execute
X ---- not execute