Dell Precision Rack 7910 - Manual (Page 2)

Description
Reference
Designator
Volatility Description
User
Accessible for
external data Remedial Action
(action necessary
to lose data)
CPLD U_CPLDA Non-volatile memory that contains
power up se-quence configuration
data required by BIOS and Hardware
to power up and boot the system No N/A
Video
memory –
type UMA
architecture-
uses system
DDR3.
Volatile memory in off state.
UMA uses main system memory size
allocated out of main memory. No Enter S3-S5 state
below.
Hard drive User
replaceable Non-volatile magnetic media, various
sizes in GB. Yes Low-level format.
CD-ROM/RW/
DVD/
DVD+RW/
Diskette
Drives/Blu
Ray User
replaceable Non-volatile optical/magnetic media. No Low-level
format/erase.
SAS / SATA
Hard Drives
and optional
storage
controller
cards User
replaceable Non-volatile data No Low-level
format/erase.
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 (DDR3, 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 (CFPU or chip set) and hardware
maintains all system contexts. The R7910 does not support S1 state at this time.
• S3 is called “suspend to RAM” state or stand-by mode. In this state the dynamic RAM is maintained. The R7910 system does
not support S3 state at this time.
• 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.
• 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.