ANALOG MODULATION MODE
3-72
Latch data utility
The
[Aux. O/P Control]
key on the
Utilities Selection Menu 1
is used as a convenient means to
change the data in the internal hardware latches as well as to control an external device connected
to the AUXILIARY IN/OUT connector. Pressing the
[Aux. O/P Control]
key causes the latch
data utility shown in Fig. 3-71 to be displayed.
Toggle
Bit
Cursor
Right
Latch
Number
LOCAL
Previous
Latch
Cursor
Left
Next
Latch
Restore
ON/OFF
1,2,3,5
Latches
Decimal/
Binary
Latch Number:
Contents:
AG1 IC010 8 bit AUXILIARY OUTPUT CONTROL
RESTORING
108 - - -
00000000
C0854
Fig. 3-71 Latch data utility with single latch selected in binary mode
Pressing the
[Restore ON/OFF]
soft key on the utility toggles between Restoring and
Non-Restoring mode.
In Restoring mode latches whose values have been changed by the user are restored to their
previous value when ANY latch is updated outside the utility (i.e. by changing any parameter).
This allows the user to select for example the
Sig Gen
menu to inspect the settings and return to
the Latch Data Utility without restoring, but ensures that the instrument will operate in the correct
manner after using this utility.
In Non-Restoring mode the modified latch will not be restored until that particular latch requires
updating because of a changed parameter. The user should be aware that changing a parameter
may affect latches associated with other functions, in particular changing the carrier frequency is
likely to update latches associated with modulation and RF level as well as the ones associated
with frequency.
[Latch Number]
is a function to specify the index number of the latch to be inspected or set.
Press numeric keys and terminate with [enter]. Information about the selected latch is
displayed on the screen, this includes the board designation, the IC designation and a brief
description of the function of the latch e.g. Latch 0 -
AA1 IC402 12 bit FM CH1 DAC (low
byte)
. Latch numbers are indicated in a box adjacent to the appropriate IC on the circuit
diagrams.
Selecting latch 108 enables 8 output lines to be configured to the rear panel AUXILIARY
IN/OUT connector. These may be used to drive external switches, filters etc.
[1,2,3,5 Latches]
allows groups of consecutive latches to be treated as a single number. The
2 latches setting is useful for the various 12-bit DACs, the 3 latches setting for the 24-bit
numbers used for the modulation oscillators and the 5 latches setting for the 40-bit numbers
used in the fractional-N controller. Each press of this key advances the selection in the
sequence 1-2-3-5-1... Information about the selected number of latches (starting at the chosen
Latch Number) is displayed.
[Decimal/Binary]
selects whether latch data is displayed or entered in decimal or binary
format. Binary is only available when the number of latches selected is 1 or 2.