Dell PowerEdge R815 - Manual (Page 6)

package
How is this memory write protected? Software write protected
Dell PERC H700i storage controller
CPLD/Flash/NVSRAM etc. (if applicable) Details
Size FRU: 256 Bytes
Boot ROM: 8 KB
Flash: 8 MB
CPLD: 128 Macrocells
NVSRAM: 128 KB
iButton key EEPROM: 128 Bytes
Battery Backed Cache: 512 MB
Type: [e.g. Flash PROM, EEPROM]: FRU, EEPROM, Flash, CPLD, Non-volatile SRAM
and a 1-wire EEPROM
Can user programs or operating system write data to it
during normal operation? No
Does it retain data when powered off? Yes
Purpose? [e.g. boot code] Flash stores the storage controllers firmware
CPLD controls the power sequencing & battery
backup logic
NVSRAM stores the controller configuration
FRU stores the PPID, manufacturing date etc.
Battery Backed Cache: Store the data if the cache is
not cleared and battery backup unit is enabled in the
case of a power loss
How is data input to this memory? FRU/CPLD data is preprogrammed at board build.
NVSRAM is updated by the storage controller
Flash is updated by Dell provided update package
Cache stores the data before getting written to the
disks, when WriteBack policy is enabled with battery
backup
How is this memory write protected? FRU is not write protected but everything else is
software write protected
Remarks PERC H700i controller is optional