Datasheet

Travelstar 80GN Hard Disk Drive Specification
69
11.0 General
11.1 Reset response
ATA has the following three types of resets:
The actions of each reset are shown in the table below.
o – execute x – does not execute
Notes:
Power On Reset (POR)
The device executes a series of electrical circuitry diagnostics, spins up the
head disk assembly, tests speed and other mechanical parametric, and sets
default values.
Hard Reset (Hardware Reset)
The RESET signal is negated in the ATA Bus. The device resets the interface
circuitry and sets the default values.
Soft Reset (Software Reset)
The SRST bit in the Device Control Register is set and then is reset. The device
resets the interface circuitry according to the Set Features requirement.
Table 44: Reset response table
POR hard reset soft reset
Aborting Host interface
-oo
Aborting Device operation
- (*1) (*1)
Initialization of hardware
oxx
Internal diagnostic
oxx
Starting or Spinning Up spindle motor
(*6) x x
Initialization of registers (*2)
ooo
DASP- handshake
oox
PDIAG- handshake
ooo
Reverting programmed parameters to default
Number of CHS (set by Initialize Device Parameters)
Multiple mode
Write Cache
Delayed Write
Read look-ahead
ECC bytes
Volatile max. Address
Address offset mode
oo(*3)
Power mode
(*6) (*4) (*4)
Reset Standby timer value (*5)
ooo
(*1) Execute after the data in write cache has been written.
(*2) The default value on POR is shown in Table 45: “Default Register Values” on page 70.
(*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 cases, the device does not
change current mode.
(*5) After reset the Standby timer value is set to 109 minutes.
(*6) Set according to the initial power mode selection.