Dell Latitude E7240 Series User manual

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Statement of Volatility – Dell Latitude E7240/E7440
CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid the
problem.
The Dell Latitude E7240/E7440 contains both volatile and non-volatile (NV) components. Volatile components lose their
data immediately after power is removed from the component. Non-volatile (NV) components continue to retain their data
even after power is removed from the component. The following NV components are present on the Latitude E7240/E7440’s
system board.
Table 1. List of Non-Volatile Components on System Board
Description Reference
Designator Volatility Description
User
Accessible for
external data
Remedial
Action (action
necessary
Embedded Flash
memory in
embedded
controller
MEC5075
U38
256K and 2K byte of embedded
Flash memory for embedded
controller BIOS code, asset tag and
BIOS passwords
No N/A
Panel EDID
EEPROM Part of LCD panel assembly
Non Volatile memory 64K bytes.
Stores panel manufacturing
information, display configuration
data
No N/A
System BIOS U1,U2
Non Volatile memory, 64Mbit
(8MB), 32Mbit (4MB)
System BIOS
and Video BIOS for basic boot
operation, PSA (on board diags),
PXE diags.
No N/A
System Memory –
DDR3L memory
Connectors
JDIMMA and
JDIMMB
Volatile memory in OFF state (see
state definitions later in text) One or
both modules will be populated.
System memory size will depend on
SoDIMM modules and will be
between 1GB to 8GB
Yes Power off
system
System memory
SPD EEPROM
On memory
SoDIMM(s) – one
or two present
Non-Volatile memory 2Kbit (256
bytes). One device present on each
SoDIMM. Stores memory
manufacturer data and timing
information for correct operation of
system memory.
No N/A
RTC CMOS UC1 Non Volatile memory 256 bytes
Stores CMOS information No
Remove the on-
board coin cell
battery
Video memory –
type – see next
column
UMA
architecture- uses
system DDR3L.
Volatile memory in off state. UMA
uses main system memory size
allocated out of main memory.
No Enter S3-S5
state below.
Security Controller
Serial Flash
Memory
U4 (up-sell USH
daughter board) Non Volatile memory, 16 Mbit (2Mbyte) No NA

Security Controller U2 (up-sell USH
daughter board) 128K byte ROM, 128K bit one time programmable No NA
TPM Controller U25 Non Volatile memory, 2K bits (256
bytes) ROM No NA
Hard
drive/mSATA
User replaceable
Non Volatile magnetic media,
various sizes in GB
Yes Low level format
DP HUB
EEPROM
U7
Non Volatile memory, 16 Mbit
(2Mbyte)
No N/A
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 (DDR3, 1067 MHz). 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. Win8 support S3 state.
S4 is called “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. 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 supported by Dell Latitude E7240/E7440:
Model Number S0 S1 S3 S4 S5
Dell Latitude ™ E7240 X
X X X
Dell Latitude ™ E7440 X
X X X
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© 2013 Dell Inc.
Trademarks used in this text: Dell™, the DELL logo, Latitude™ are trademarks of Dell Inc. Intel®, Pentium®, Xeon®, Core™ and Celeron® are
registered trademarks of Intel Corporation in the U.S. and other countries. Microsoft®, Windows® are either trademarks or registered trademarks of
Microsoft Corporation in the United States and/or other countries.