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?
SPD
Non-
Volatile
1
U22
256 B
SPD
No
Memory
configuration
data
Pre-
programm
ed before
assembly
No write
protect. Not
visible to Host
Processor
User cannot clear.
Backup Flash
Non-
Volatile
1
U1100
8 GB
Backup
Flash
No
Holds cache
data during
power loss
FPGA
backs up
DDR data
to this
device in
case of a
power
failure
No write
protect. Not
visible to Host
Processor
Flash can be cleared
by powering up the
card and allowing the
controller to flush the
contents to VDs. If the
VDs are no longer
available, cache can
be cleared by going
into controller bios and
selecting Discard
Preserved Cache.
SDRAM
Volatile
9
U1077-
U1085
8 GB
SDRAM
No
Cache for
HDD I/O
ROC writes
to this
memory -
using it as
cache for
data IO to
HDDs
No write
protect. Not
visible to Host
Processor
Cache can be cleared
by powering off the
card
H330 PERC
NVSRAM
Non-
Volatile
1
U1033
128 KB
NVSRAM
No
Configuration
data
ROC writes
configuratio
n data to
NVSRAM
No write
protect. Not
visible to Host
Processor
User cannot clear.