13.0 General operation
13.1 Reset response
There are three types of resets in ATA:
Power On Reset (POR)
The device executes a series of electrical circuitry diagnostics, spins up the HDA, tests
speed and other mechanical parametrics, and sets default values.
Hard Reset (Hardware Reset)
RESET- signal is negated in ATA Bus. The device resets the interface circuitry as well as
Soft Reset.
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 is shown in the following figure.
(*4)(*4)(*5)Power mode
XXODisable Standby timer
(*3)(*3)OReverting programmed parameters to default
y
Number of CHS (set by Initialize Device Parameters)
y
Multiple mode
y
Write Cache
y
Read look-ahead
y
ECC bytes
OOOPDIAG handshake
XOODASP handshake
OOOInitialization of registers (*2)
XXOSpinning spindle
XXOInternal diagnostic
XXOInitialization of hardware
(*1)(*1)–Aborting Device interface
OO–Aborting Host interface
soft resethard resetPOR
O - execute
X - not execute
Notes:
(*1) Execute after the data in write cache has been written
(*2) Default value on POR is shown in Figure 66, "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
Figure 65. Reset Response table
Deskstar 60 GXP Hard disk drive specification
75
To Next Page
Loading...
