Agilent Technologies E8267D PSG, E8257D PSG manual Hard Disk Memory

Basic Operation

Using Security Functions

Table 2-3 Baseband Generator Memory (Options 601 and 602) (Continued)

Memory	DuringWritable Operation?Normal		RetainedData PoweredWhenOff?
Type					Purpose/Contents		Data Input Method		Remarks
and Size
BBG	No		Yes		firmware image for		firmware upgrade
Firmware					baseband generator
Memory
(Flash)
32 MB
Coprocessor	Yes		No		operating memory of		During normal		This memory is used during normal baseband
Memory					baseband coprocessor CPU		operation, some		generator operation. It is not directly accessible by
(SRAM)							user information,		the user. Not battery backed.
32 MB							such as payload
							data, can remain in
							the memory.
Buffer	No		No		support buffer memory for		normal user		This memory is used during normal baseband
Memory					ARB and real- time		operation		generator operation. It is not directly accessible by
(SRAM)					applications				the user. Not battery backed.
5 x 512 kB
Table 2-4 Hard Disk Memory
Memory		DuringWritable Operation?Normal		RetainedData PoweredWhenOff?		Purpose/Contents		Data Input Method		Remarks
Type
and Size
Media		Yes		Yes		user files, including flatness		user- saved data		The magnetic residue requires several rewrite
Storage						calibrations, IQ calibration,				cycles or drive removal and destruction.
(Built- in						instrument states,				The hard disk is an option and is therefore
Hard Disk)						waveforms (including header
										not installed in some instruments. If it is
						and marker data),
6 GB or										installed, these files are stored on the hard
						modulation definitions, and
10 GB										disk instead of in flash memory.
						sweep lists
(4 GB usable
										User data is completely sanitized when you
in both
										perform the Erase and Sanitize function.
cases)
Buffer		No		No		buffer (cache) memory		normal operation
Memory								through hard disk
(DRAM)
512 kB

62 Chapter 2