Reference Guide

Item
Non-
Volatile or
Volatile
Quantity
Reference
Designator
Size
Type (e.g.
Flash PROM,
EEPROM)
Can user programs
or operating
system write data
to it during normal
operation?
Purpose?
(e.g. boot
code)
How is
data input
to this
memory?
How is this
memory
write
protected?
How is the memory
cleared?
accessible in Lifecycle
Controller interface
CPU Vcore
and Memory
regulator
Non-
Volatile
2
PU2, PU9
16 KB
ROM
No
Operational
parameters
Programme
d at factory
via I2C
No write
protect
User cannot clear.
Vmem
Regulators
Non-
Volatile
2
PU15,
PU21
16 KB
ROM
No
Operational
parameters
Programme
d at factory
via I2C
no write
protect
User cannot clear.
System CPLD
RAM
Volatile
1
U_CPLD
92 KB
Flash
No
Not utilized
Not utilized
Not
accessible
Not accessible
System CPLD
FLASH
Non-
Volatile
1
U_CPLD
256 KB
RAM
No
Power on
System
Firmware
Firmware
update
BIOS Security
Protocols
User cannot clear.
System
Memory:
RDIMM and
LRDIMM
Volatile
Up to 16
per CPU
CPU1<2:1>
_CH<5:0>_
D<1:0>
Up to 64
GB per
DIMM
DRAM
Yes
System OS
RAM
System OS
OS Control
Reboot or power down
system
System
Memory:
NVDIMMM-N
Non-
Volatile
Up to 4
per
CPUs 1
and 2 (12
total in
system)
CPU1<2:1>
_CH<5:0>_
D1
128 GB
per
NVDIMM-
N
Flash –
NVDIMM
No
Data integrity
When
system
initiates a
Save (AC
loss,
shutdown,
etc.),
NVDIMM-N
controller
will transfer
data from
Neither
system nor
OS can
access the
flash, only a
system
initiated Save
will trigger the
NVDIMM-N
controller to
transfer data
Using BIOS menu
option, select
NVDIMM factory reset