General Operation; Reset Response; Table 65. Reset Response Table - Hitachi 7K400 - Deskstar Hard Drive Specifications

10.0 General operation

10.1 Reset response

ATA has the following three types of resets:
Power On Reset (POR)
Hard Reset (Hardware Reset) The RESET- signal is negated in the ATA Bus. The device resets the interface
Soft Reset (Software Reset)
The actions of each reset are shown in the table below.
Table 66: Reset response table
Aborting Host interface
Aborting Device operation
Initialization of hardware
Internal diagnostic
Spinning spindle
Initialization of registers (*2)
DASP handshake
PDIAG handshake
Reverting programmed parameters to default
Number of CHS (set by Initialize
Device Parameters)
Multiple mode
Write Cache
Read look-ahead
ECC bytes
Power mode
Disable Standby timer(*5)
O – execute
Notes:
(*1) Execute after the data in write cache has been written.
(*2) The default value on POR is shown in Table 67: "Default Register Values" on page 76.
(*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.
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.
circuitry and sets the default values.
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.
X – does not execute
Deskstar 7K400 Hard Disk Drive Specification
POR
-
-
O
O
O
O
O
O
O
(*5)
O
75
hard reset soft reset
O O
(*1) (*1)
X X
X X
X X
O O
O X
O O
(*3) (*3)
(*4) (*4)
X X