Agilent Technologies E8257D PSG Baseband Generator Memory Options 601, Base Instrument Memory

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

Chapter 2 61