IBM DTTA-351010 Hard Drive Specifications - Page 81

General Operation Descriptions

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10.0 General Operation Descriptions 10.1 Reset Response There are three types of reset in ATA as follows: 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 Figure 62 POR hard soft reset reset Aborting Host interface Aborting Device operation Initialization of hardware o Internal diagnostic o Spinning spindle o Initialization of registers (*2) o DASP handshake o PDIAG handshake o Reverting programmed parameters to default o Number of CHS (set by Initialize Device Parameter) Multiple mode Write cache Read look ahead ECC bytes Disable Standby timer o Power mode Idle o (*1) x x x o o o (*3) x (*4) o (*1) x x x o x o (*3) x (*4) o execute x not execute Figure 62. Reset Response Table Note. (*1) (*2) (*3) Execute after the data in write cache has been written. Default value on P O R is shown in Figure 63 on page 74. The Set Features command with Feature register = CCh enables the device to revert these parameters to the power on defaults. © Copyright IBM Corp. 1998 73

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10.0 General Operation Descriptions
10.1 Reset Response
There are three types of reset in ATA as follows:
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 Figure 62
POR
hard
soft
reset reset
Aborting Host interface
o
o
Aborting Device operation
(*1)
(*1)
Initialization of hardware
o
x
x
Internal diagnostic
o
x
x
Spinning spindle
o
x
x
Initialization of registers
(*2)
o
o
o
DASP handshake
o
o
x
PDIAG handshake
o
o
o
Reverting programmed parameters to default
o
(*3)
(*3)
Number of CHS
(set by Initialize Device Parameter)
Multiple mode
Write cache
Read look ahead
ECC bytes
Disable Standby timer
o
x
x
Power mode
Idle
(*4)
(*4)
o
execute
x
not execute
Figure 62. Reset Response Table
Note.
(*1)
Execute after the data in write cache has been written.
(*2)
Default value on POR is shown in Figure 63 on page 74.
(*3)
The Set Features command with Feature register =
CCh enables the device to revert these
parameters to the power on defaults.
Copyright IBM Corp. 1998
73