Deskstar T7K500 Hard Disk Drive Specification
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10.0 General operation
10.1 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 56: Reset response table
POR hard reset soft reset
Aborting Host interface
-OO
Aborting Device operation
- (*1) (*1)
Initialization of hardware
OXX
Internal diagnostic
OXX
Spinning spindle
OXX
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
Read look-ahead
ECC bytes
O (*3) (*3)
Power mode
(*5) (*4) (*4)
Disable Standby timer(*5)
OXX
(*1) Execute after the data in write cache has been written.
(*2) The default value on POR is shown in Table 57: “Default Register Values” on page 78.
(*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) Idle when Power-Up in Standby feature set is disabled. Standby when Power-Up in Standby feature set is
enabled.
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