CDB61581 Datasheet, PDF (10/16 Pages) Cirrus Logic – Universal Line Interface Unit

CDB61581
11.5. Modify Unit Interval
The user modifies the data in the AWG RAM using
the Transmitter RAM UI Config window (see
Figure 3). At the top of this window are three radio
buttons used for selecting one of the three unit in-
tervals. At the lower right is another set of radio
buttons, one for each of the prestored waveforms in
ROM (config 0 through config f). After having se-
lected the desired UI and line configuration, click-
ing on the Read button will display the contents of
the given waveform in the Time Slot fields. These
values are displayed in hexadecimal format. The
user can modify these values by clicking on the se-
lection arrow and scrolling up and down through
the possible values. After making the necessary
modifications, the user clicks the “Save to UI” but-
ton to save the data for that UI to the PC’s memory.
When all three UI’s have been saved, the new val-
ues are written to the AWG RAM on the device by
going back to the Transmitter RAM Configuration
window and clicking on the Write to RAM button.
Notice that this window also has selections for the
6V pulse and Match Z buttons. These are dupli-
cates of the buttons in the LIU Configuration win-
dow. Clicking on these buttons sets or resets these
bits in the configuration registers.
These settings are reset to the initial state when the
window is closed. The Save Screen and Restore
Scrn buttons must be used if the user wishes to exit
this window and come back to the same setup.
Figure 3. Modify Unit Interval Window
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