Hitachi HTS543216L9SA00 General Operation Descriptions, Reset Response, Register Initialization

5K320 SATA OEM Specification

12 General Operation Descriptions

12.1 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,
COMRESET	tests speed and other mechanical parametric, and sets default values.
	COMRESET is issued in Serial ATA bus.
Soft Reset (Software Reset)	The device resets the interface circuitry as well as Soft 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 are shown in “Table 29 Reset Response Table” on Page 51

	POR	COMRESET	Soft Reset
Aborting Host interface	-	o	o
Aborting Device operation	-	(*1)	(*1)
Initialization of hardware	O	x	x
Internal diagnostic	O	x	x
Starting spindle motor	(*5)	x	x
Initialization of registers (*2)	O	o	o
Reverting programmed parameters to default	O	(*6)	(*3)
- Number of CHS (set by Initialize Device Parameter)
- Multiple mode
- Write cache
- Read look-ahead
- ECC bytes
- Volatile max address
Power mode	(*5)	(*4)	(*4)
Reset Standby timer value	o	o	x
O ---- execute
X ---- not execute
Note.

(*1) Execute after the data in write cache has been written.

(*2) Default value on POR is shown in “Table 30 Default Register Values” on Page 52.

(*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 case, the device does not change current mode.

(*5) According to the initial power mode selection.

(*6) See 12.15 Software Setting Preservation Feature Set.

Table 29 Reset Response Table

12.1.1Register Initialization

After power on, COMRESET, or software reset, the register values are initialized as shown in the following table.

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