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60 Chapter 2
Basic Operation
Using Security Functions
section also have an equivalent SCPI command for remote operation. (Refer to the “System
Commands” chapter of the E8257D/67D PSG Signal Generators SCPI Command Reference for more
information.)
Understanding PSG Memory Types
The PSG comprises several memory types, each used for storing a specific type of data. Before
removing sensitive data, it is important to understand how each memory type is used in the PSG.
The following tables describe each memory type used in the base instrument, optional baseband
generator, and optional hard disk.
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 factor y
calibration/configuratio
n 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