Dell Latitude E5440 (Late 2013) User Manual

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Description

Reference
Designator

Volatility Description

User
Accessible
for external
data

Remedial Action (Action
necessary to prevent loss of
data)

systems use
DDR3L
(UV4-UV7)
for frame
buffer

DP hub
FW

This is volatile memory for DP
hub FW (1Mbit).

N/A

mSATA

JMINI2

mSATA module would share
with WWAN module on full
size mini-card. Non Volatile
memory (SSD)

Yes

Low level format

TPM
Controller

U25

Non Volatile memory, 2K bits
(256 bytes) ROM

N/A

Hard drive

User
replaceable

Non Volatile magnetic media,
various sizes in GB

yes

Low level format

CD-
ROM/RW/
DVD/
DVD+RW/
Diskette
Drives

User
replaceable

Non Volatile optical media.

Yes

Low level format/erase

CAUTION: All other components on the system board lose data if power is removed from the system. Primary power
loss (unplugging the power cord and removing the battery) destroys all user data on the memory (DDR3L,
1333/1600MHz). Secondary power loss (removing the on-board coin-cell battery) destroys system data on the system
configuration and time-of-day information.

All other components on the motherboard will lose data once power is removed from the system. Primary power loss
(Unplug the power cord and remove the battery) will destroy all user data on the memory (DDR3L, 1333/1600MHz).
Secondary power loss (removing the on board coin-cell battery) will destroy system data on the system configuration
and time-of-day information.

In addition, to clarify memory volatility and data retention in situations where the system is put in different ACPI power
states the following is provided (those ACPI power states are S0, S1, S3, S4 and S5):

S0 state is the working state where the dynamic RAM is maintained and is read/write by the processor.

S1 state is a low wake-up latency sleeping state. In this state, no system context is lost (CPU or chip set) and hardware
maintains all system contexts.

S3 is called “suspend to RAM” state or stand-by mode. In this state the dynamic RAM is maintained. Dell systems will
be able to go to S3 if the OS and the peripherals used in the system supports S3 state. Linux, Win7 and Win8 support
S3 state.

S4 is calle

d “suspend to disk” state or “hibernate” mode. There is no power. In this state, the dynamic RAM is not

maintained. If the system has been commanded to enter S4, the OS will write the system context to a non-volatile
storage file and leave appropriate context markers. When the system is coming back to the working state, a restore file
from the non-volatile storage can occur. The restore file has to be valid. Dell systems will be able to go to S4 if the OS
and the peripherals support S4 state. Win7 and Win8 support S4 state.
S5 is the “soft” off state. There is no power. The OS does not save any context to wake up the system. No data will
remain in any component on the system board, i.e. cache or memory. The system will require a complete boot when
awakened. Since S5 is the shut off state, coming out of S5 requires power on which clears all registers.

The following table shows all the states suppo

rted by Dell Latitude™E5440/E5540: Model Number

Model Number

Dell Latitude™ E5440

Dell Latitude™ E5540