76 Chapter 3
Basic Operation
Using Security Functions
Main
Memory
(Flash)
20 MB
Yes Yes factory
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) 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,
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 motherboard.
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.
Table 3-1 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
To Next Page
Loading...
Need help?
General
