Non-Volatile Memory - Racal Instruments 1256 Manual

1256 User Manual

Non-Volatile Memory

PROBLEM
Switch states or menu
settings that have been
saved to non-volatile memory
are lost the next time power
is turned on.
Troubleshooting C-6
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POSSIBLE CAUSES
•
Switch states and menu
settings must be saved in a
two-step process:
1. Save to the non-volatile
memory image, located in
SRAM.
2. Save the image to non-
volatile memory.
The reason for this
implementation is that non-
volatile memory is
inherently much slower
than SRAM. By saving the
image to non-volatile
memory just one time
instead of performing a
separate block write for
each piece of data, the
slow non-volatile write cycle
is encountered just once.
Publication No. 980855 Rev. A
WHAT TO DO
•
After saving switch states or
menu preferences to the
image, save the image to non-
volatile memory before turning
power off (see Chapter 3,
Using the Front-Panel
Controls, under the heading
Store/Recall Menu).
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