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Chapter 2 61
Basic Operation
Using Security Functions
Battery
Backed
Memory
(SRAM)
512 kB
Yes Yes user-editable data
(table editors)
last instrument state,
last instrument state
backup, and persistent
instrument state and
instrument status
firmware operations CPU board
The battery can be removed to sanitize the memory,
but must be reinstalled for the instrument to operate.
The battery is located on the CPU board.
Bootrom
Memory
(Flash)
128 kB
No Yes CPU bootup program
and firmware
loader/updater
factory programmed CPU board
During normal operation, this memory cannot be
overwritten or erased. This read-only data is
programmed at the factory.
Calibration
Backup
Memory
(Flash)
512 KB
No Yes factory
calibration/configuratio
n data backup
no user data
factory or service
only
motherboard
Boards
Memory
(Flash)
512 Bytes
No Yes factory calibration and
information files, code
images, and self-test
limits
no user data
factory or service
only
all RF boards, baseband generator, and motherboard
Micro-
processor
Cache
(SRAM)
3 kB
Yes No CPU data and
instruction cache
memory is managed
by CPU, not user
CPU board, not battery backed.
Table 2-3 Baseband Generator Memory (Options 601 and 602)
Memory
Type
and Size
Writable During
Normal Operation?
Data Retained
When Powered Off?
Purpose/Contents Data Input Method Remarks
Waveform
Memory
(SDRAM)
40−320 MB
Yes No waveforms (including header
and marker data) and PRAM
normal user
operation
User data is completely sanitized when you
perform the
Erase and Sanitize function. Not battery
backed.
Table 2-2 Base Instrument Memory (Continued)
Memory
Type
and Size
Writable During
Normal Operation?
Data Retained
When Powered Off?
Purpose/Contents Data Input Method Location in Instrument and Remarks