IBM DTLA-305040 Hard Drive Specifications - Page 87

General Operation, 1 Reset response

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10.0 General operation 10.1 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. Aborting Host interface Aborting Device interface Initialization of hardware Internal diagnostic Spinning spindle Initialization of registers (2) DASP handshake PDIAG handshake Reverting programmed parameters to default Ÿ Number of CHS (set by Initialize Device Parameters) Ÿ Multiple mode Ÿ Write Cache Ÿ Read look-ahead Ÿ ECC bytes Disable Standby timer Power mode POR - - O O O O O O O O (5) hard reset soft reset O O (1) (1) X X X X X X O O O X O O (3) (3) X X (4) (4) 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 74 on page 0 (3) The Set Features command with Feature register = CCh enables the device to revert these para- meters 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 73. Reset Response Table Deskstar 40GV & 75GXP hard disk drive specifications 75

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10.0
General operation
10.1 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 inter-
face circuitry according to the Set Features requirement.
The actions of each reset is shown in the following figure.
(4)
(4)
(5)
Power mode
X
X
O
Disable Standby timer
(3)
(3)
O
Reverting programmed parameters to default
°
Number of CHS (set by Initialize Device Parameters)
°
Multiple mode
°
Write Cache
°
Read look-ahead
°
ECC bytes
O
O
O
PDIAG handshake
X
O
O
DASP handshake
O
O
O
Initialization of registers (2)
X
X
O
Spinning spindle
X
X
O
Internal diagnostic
X
X
O
Initialization of hardware
(1)
(1)
–
Aborting Device interface
O
O
–
Aborting Host interface
soft reset
hard reset
POR
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 74 on page 0
(3)
The Set Features command with Feature register = CCh enables the device to revert these para-
meters 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 73. Reset Response Table
Deskstar 40GV & 75GXP hard disk drive specifications
75