1257 User Manual
Troubleshooting C-6
EADS North America Defense
Test and Services, Inc.
©
2001
Non-Volatile Memory
PROBLEM
POSSIBLE CAUSES
WHAT TO DO
Switch states or menu
settings that have been
saved to non-volatile memory
are lost the next time power
is turned on.
•
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.
•
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
).
Summary of Contents for 1257
Page 6: ......
