User manual
46
Mixed-Signal Operation
number of data and clock signals. The universal knob al-
lows you to select the BUS type PARALLEL or PARALLEL
CLOCKED. Select CONFIGURATION to determine the bus
source and structure. The contents of the menu change
with the selected BUS type. After pressing the top soft
menu key BUS WIDTH, you can use the universal knob to
select a bus width from 1-8 bits. The table displaying the
bit assignments will be adjusted dynamically depending
on your choice. Each bit of the displayed bus has a source.
The source refers to the individual POD bits. Based on the
measurement setup, the sources can be assigned via soft
menu key SOURCE and the universal knob in the CUR-
SOR/MENU section.
The soft menu keys PREVIOUS/NEXT BIT allow you to
move the position of the selection bar for the source of
the individual bits. The selected bit is highlighted in blue.
Theleftsideofthetablecontainsthebitsinxedse-
quence, beginning at the top with D0 (= LSB). The univer-
sal knob allows you to assign a real logic channel to the
selected BUS bit. The allocation is not subject to restric-
tions; you can also use partially identical logic channels in
the two possible buses. If you select PARALLEL CLOCKED
as BUS TYPE, you can also use the bottom soft menu key
CONTROL WIRES to select sources for CHIP SELECT, and
you can use the universal knob to select the settings for
CLOCK. The soft menu key ACTIVE is used to determine if
the chip select signal High or Low Active is selected.
The soft menu key SLOPE allows you to toggle between ri-
sing, falling and both slopes. The active selection is always
highlighted in blue and is listed after the label CLK in the
bit source window. Press the MENU OFF button to return
to the BUS main menu.
The soft menu DISPLAY SETUP opens a menu to select
the display format and its extent. The universal knob in the
submenu allows you to choose the format to decode the
bus values. You can choose from the following formats:
❙ Binary
❙ Hexadecimal
❙ Decimal
❙ ASCII
The decoded values will be shown in the cells/tables of
the buses according to the selected format. The next soft
menu key BITS can also be used to activate (ON) or deacti-
vate (OFF) the table display for the individual bus bits. You
can use the POSITION control knob to determine the posi-
tion of the bus display on the screen. The VOLT/DIV knob
allows you to determine the size of the table display. This
may be particularly useful for the binary display as it allows
the display of the complete value in up to 4 rows even for
short tables.
11.4 Cursor Measurements for Logic Channels
If the logic channels are activated, you may select several
parameters via cursor measurements (CURSOR MEASURE
button). For all activated logic channels of a POD, you can
choose from the following measurement types:
❙ TIME:
The display will include the time position of both cursors
relative to the trigger time, the time difference between
the two positions and the resulting frequency.
❙ RATIO X:
In this measurement type, three cursors are used to
displayatimeratiobetweenthersttwocursorsplusthe
rstandthirdcursor.Theresultsareshowninoating
point format, in percent, in degrees and in radians.
❙ V-MARKER:
For the logic channels, the logic value of the selected POD
will be measured at the respective cursor and shown in
hexadecimal and decimal format.
11.5 Automatic Measurements for Logic Channels
If the logic channels are activated, you can use the au-
tomatic measurement functions to determine several
parameters.
For all activated logic channels of a POD, you can choose
from the measurement types:
❙ FREQUENCY
❙ PERIOD
❙ PULSE WIDTH +/–
❙ DUTY CYCLE+/–
❙ DELAY
❙ PHASE
❙ BURST WIDTH
❙ COUNT PULSE +/–
❙ COUNT (pos./neg.)