Reference Guide

DELL CONFIDENTIAL Page 1
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Statement of Volatility – Dell Latitude™ E6420,
Dell Latitude™ E6420 ATG
The Dell Latitude™ E6420 and Dell Latitude™ E6420 ATG contains both “volatile” and “non-volatile” (NV)
components. Volatile components lose their data immediately upon removal of power from the component. Non-
volatile components continue to retain their data even after the power has been removed from the component.
The following volatile and NV components are present on the Dell Latitude™ E6420 motherboard:
Description
Reference
Designator
Volatility Description
User Accessible
for external data
Remedial Action
(action necessary to
lose data)
Embedded
Flash
memory in
embedded
controller
MEC5055
U51
256K byte 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
U52, U53
Non Volatile memory, 64Mbit
(8MB), 16Mbit (2MB) System
BIOS and Video BIOS for
basic boot operation, PSA (on
board diags), PXE diags.
No
N/A
System
Memory –
DDR3
SODIMM
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, No
Power off system
N/A
System
memory
SPD
EEPROM
On memory
SoDIMM(s) –
one or two
present
Non-Volatile EEPROM
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
UH4
Non Volatile Battery back-
backed CMOS memory 256
bytes
Stores CMOS information
No
Removing the on
board Coin Cell
battery