66 Chapter 2
Basic Operation
Using Security Functions
Table 2-2 Base Instrument Memory
Memory
Type
and Size
Writable During
Normal Operation?
Data Retained
When Powered Off?
Purpose/Contents Data Input Method Location in Instrument and Remarks
Main
Memory
(SDRAM)
64 MB
Yes No firmware operating
memory
operating system
(not user)
CPU board, not battery backed.
Main
Memory
(Flash)
20 MB
Yes Yes fact or y
calibration/configuration
data
user file system, which
includes instrument
status backup, flatness
calibration, IQ
calibration, instrument
states, waveforms
(including header and
marker data), modulation
definitions, and sweep
lists
firmware upgrades
and user–saved
data
CPU board (same chip as firmware memory, but
managed separately)
User data is not stored in this memory if hard
disk (Option 005) or the removable compact flash
drive (Option 008 or 009) is installed.
Because this 32 MB memory chip contains 20 MB
of user data (described here) and 12 MB of
firmware memory, a selective chip erase is
performed. User data areas are selectively and
completely sanitized when you perform the Erase
and Sanitize function.
Firmware
Memory
(Flash)
12 MB
No Yes main firmware image factory installed or
firmware upgrade
CPU board (same chip as main flash memory, but
managed separately)
During normal operation, this memory cannot be
overwritten except for LAN configuration. It is
only overwritten during the firmware installation
or upgrade process.
Because this 32 MB memory chip contains 20 MB
of user data and 12 MB of firmware memory
(described here), a selective chip erase is
performed. User data areas are selectively and
completely sanitized when you perform the Erase
and Sanitize function.
Yes Yes LAN configuration front panel entry or
remotely
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.
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