1257 User Manual
Using the Front Panel Controls 3-22
EADS North America Defense
Test and Services, Inc.
©
2001
Type: State
> Config: Powerup <
< Do?: Store
Press the fourth key (bottom) to store the power-up state.
Pressing any other key cancels the change.
NOTE:
After storing the power-up state, the non-volatile image must
be written to non-volatile RAM. Refer to the section Updating
Non-Volatile RAM for instructions.
Updating Non-Volatile RAM
Writes to non-volatile (flash) RAM are inherently slow. If presets
were stored directly in non-volatile RAM, the user would have to
wait several seconds for each store operation. This may not
always be an inconvenience when working with the front-panel
controls, but would certainly slow down software that
automatically sets up and stores many presets.
To avoid the delay after storing each preset, the presets are
written to a temporary area of the static random-access memory
(SRAM). This memory is volatile (will erase upon power-down),
but is very fast. This allows presets to be stored rapidly. Once the
last desired preset has been stored, the presets stored in SRAM
(known as the SRAM image) may be written to non-volatile RAM
all at once. Since the non-volatile RAM is block-oriented, it takes
the same amount of time to write many presets as to write just
one. Thus, by writing all of the desired presets to non-volatile
RAM just once, much time is saved.
To update the non-volatile RAM with the SRAM image, follow
these steps:
1. Press the top key next to the display. Rotate the knob until
the top line reads:
>---STORE/RECALL---<
2. Select line 2 (next to the top line) by pressing the second
key. Rotate the knob until line 2 of the display reads as
follows:
---STORE/RECALL---
> Type: NVRAM <
Config: Image
Status: Erase
3. Press the fourth key to select line 4 of the display. Rotate
the knob until line 4 reads:
