Dell PowerEdge R810 - Manual (Page 6)

Purpose? [e.g. boot code] Stores PSU controller firmware. FRU information for
boards such as name, manufacturing date etc.
How is data input to this memory? FRU data pre-programmed by the PSU vendors. PSU
firmware can be updated by Dell provided update
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 and 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