Samsung 100737108-A

Setting of the UDMA mode will not alter the speed of the SATA interface transfer. SATA transfer speed is

depending upon the negotiated interface speed of either Gen III 6.0 Gbps ~ Gen I 1.5 Gbps. The mode setting

in the Set Feature command is for backward co mpatibility purpose.

8.2.30 Set Max Address (F9h, 37h: extended)

Set Max Address command is for device implement the Host Protected Area feature set. The drive maximum

address can be changed according to the command issued from the host. The Set Max command has the

following subcommands:

Table 8-13 Set Max Feature Register Values

Obsolete

SET MAX SET PASSWORD

SET MAX LOCK

SET MAX UNLOCK

SET MAX FREEZE LOCK

05-FFh

Reserved

This command enables the d rive to perform Read and Write Multiple operations and establishes the block

count for these commands.

The Sector Count register is loaded with the number of sectors per block. Drives support block sizes of 2, 4, 8,

and 16 sectors. If the Sector Count register contains a valid value and the block count is supported, the

value is

loaded for all subsequent Read Multiple and Write Multiple co mmands and execution of those

commands is

enabled. If a block count is not supported, an Aborted Command error is posted, and Read Multiple and

Write Multiple commands are disabled.

At power-on, or after a hardware reset, the default mode is Read and Write Multiple disabled. And on

software reset, the default mode of Read and Write Multiple will not be changed.

This command is the only way to cause the drive to enter Sleep Mode. The drive is spun down, and when it is

stopped, BSY is cleared, an interrupt is generated, and the interface becomes inactive.

The only way to recover from Sleep mode without a reset or power-on is for the host to issue a software reset.

A drive shall not power-on in Sleep Mode nor remain in Sleep Mode following a reset sequence. If the drive is

already spun down, the spin down sequence is not executed.

8.2.33 Standby (E2h)

This command causes the drive to set BSY, enter the Standby Mode, clear BSY, and assert INTRQ. INTRQ is

asserted even though the device may not have f ully transitioned to Standby Mode.

If the Sector Count register is non-zero, then the Standby Timer is enabled. The value in the Sector Count

The value in the Sector Count register when the STANDBY command is issued shall determine the time

period programmed into the Standby Timer.