Intel® Solid-State Drive 535 Series (2.5-inch)

September 2015

Product Specification

332062-003US

21

5.6

DevSleep

Intel SSD 535 Series supports the DevSleep feature. DevSleep must be enabled on the device by the

host system through the SET FEATURES command. If DevSleep is enabled by the host, the host must drive

the DevSleep signal to proper assert/de-assert voltage levels according to the SATA specification. Entry into

DevSleep must be preceded by LPM slumber entry by host and device. The Intel SSD 535 Series also supports

DevSleep_to_ReducedPwrState which allows the host to wake the drive using normal LPM COMWAKE

out-of-band signaling.

For the Intel SSD 535 Series, the recommended total time to DevSleep for system active state is 6 sec.

The AHCI* controller has 4 parameters used to define proper DevSleep operation between the host and drive.

The following table provides those recommended values for the Intel SSD 535 Series drive.

Table 20: DevSleep Control Parameters

Parameter

Definition

Control

Recommended

Settings

DITO

DevSleep Idle Time Out – number of

milliseconds prior to host asserting

DevSleep

Set by Host

Active (lid-up): 375

DM

DITO Multiplier – set once at boot-up

Set by Host

15

MDAT

Minimum DevSleep Assertion Time –

minimum time in milliseconds for host to

assert DevSleep

Reported by Drive

10

DETO

DevSleep Exit Time Out – max time in

milliseconds from when DevSleep is

negated to when device ready to detect

OOB

Reported by Drive

20

Total time to DevSleep entry = DITO * (DM+1)

5.7

SMART Command Transport

With SMART Command Transport (SCT), a host can send commands and data to an SSD and receive status

and data from an SSD using standard write/read commands to manipulate two SMART Logs:

 Log Address E0h ("SCT Command/Status") — used to send commands and retrieve status

 Log Address E1h ("SCT Data Transfer") — used to transport data