Hitachi HDS723020BLA642 Deviations from Standard, Physical Interface, Registers, Check Power Mode

7K200 SATA OEM Specification

9 Deviations from Standard

The device conforms to the referenced specifications, with deviations described below.

The interface conforms to the Working Document of Information Technology, AT Attachment 8 – ATA/ATAPI Command Set (ATA/ATAPI8-ACS) Revision 3f dated 11 Dec. 2006, with deviation as follows:

S.M.A.R.T. Return Status	S.M.A.R.T. RETURN STATUS subcommand does not check advisory attributes.
	That is, the device will not report threshold exceeded condition unless pre-failure
	attributes exceed their corresponding thresholds. For example, Power-On Hours
	Attribute never results in negative reliability status.
Check Power Mode	Check Power Mode command returns FFh to Sector Count Register when the device
	is in Idle mode. This command does not support 80h as the return value.

10 Physical Interface

Physical Interface is described in Functional Specification part.

11 Registers

In Serial ATA, the host adapter contains a set of registers that shadow the contents of the traditional device registers, referred to as the Shadow Register Block. Shadow Register Block registers are interface registers used for delivering commands to the device or posting status from the device. About details, please refer to the Serial ATA Specification.

In the following cases, the host adapter sets the BSY bit in its shadow Status Register and transmits a FIS to the device containing the new contents.

•Command register is written in the Shadow Register Block

•Device Control register is written in the Shadow Register Block with a change of state of the SRST bit

•COMRESET is requested

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