User manual

39
Mixed-Signal Operation
12 Mixed-Signal
Operation
As a standard, the R&S®HMO1002 is equipped with the
connectors for the HO3508 logic probes to add 8 digital
logic inputs. All software required for the mixed signal
operationisalreadyincludedinthermwareofeachHMO.
It is only necessary to purchase and connect the active
HO3508 logic probes (8 channels). If you activate the POD,
analog channel 2 will be deactivated automatically. This
onlyallowsthecongurationof1analogchannel+8logic
channels on the screen.
12.1 Logic Trigger for Digital Input
12.2 Display Functions for the Logic Channels
To switch on the digital channels, press the POD key in
the VERTICAL section. The digital channels 0 to 7 will now
display on the screen. For the series HMO3002, the logic
channels are activated by pressing the keys POD1 and
POD2 on the front panel. For the logic channels, a logic
One will be indicated by a bar that is two pixels wide, and
a logic Zero will be indicated by a bar that is one pixel
wide.Thesetlogiclevelandagurewhichshowsthe
logical states will be shown next to the name POD in the
informationeldinthebottomleftofthedisplay.
You may now choose the Y position and the size of the lo-
gicchanneldisplayjustasyouwouldfortheanalogchan-
nels. Use the knobs Y-POSITION
18
and VOLTS/DIV
20
to
select the settings (if the soft menu key “0/7“ is selected,
indicated by a blue background). If you wish to display
Fig. 12.1: Optional logic probe HO3508
Please nd an additional description of the logic trigger for the
inputs of the logic probe in chapter 6.3.3.
You must always set the level to distinguish between the logic
states (High/Low) in the VERTICAL MENU..
fewer than 8 logic channels or change the position and
size of a particular logic channel, you can use the short
menu in combination with the soft menu keys (channel 0
to 7) and the buttons Y-POSITION
18
and VOLTS/DIV
20
to
select the respective settings. You can choose a channel
by pressing the and soft menu keys. This allows you to
resizeandpositionspecicchannelsindividually.
You can reset the position and size of the individual logic
channels on page 2|2 of the POD menu. You also have the
option to label the individual bits of the logic channel by
using the soft menu NAME. This name will be displayed
on the gridandtheprintout.Yourrstoptionistoswitch
the display on (ON) or off (OFF). The next option includes
the menu item LIBRARY. After selecting this option, you
can use the universal knob to choose a name from several
suggestions. The EDIT LABEL key allows you to enter
a completely new name or to customize the suggested
name. You may enter up to 8 characters. Use the ACCEPT
keytoconrmthenameintheeditor.Itwillthenbeshown
inthedisplay.Thenameisassignedtothatspecicsignal
and will move alongside any set offset value.
12.3 Display of Logic Channels as BUS
You also have the option to combine digital channels to
form buses which will then be displayed on the screen
as a cell in a table. Basically, two independent buses are
possible. For instance, it would be possible to combine an
8 bit address bus and an 8 bit data bus. To select the set-
tings for the buses, press the BUS button in he VERTICAL
section. Then press the MENU button in the VERTICAL
section. In the menu that opens you can press the top soft
menukeyBUStoselectwhichBUSyouwanttodene,B1
or B2.
You can use the soft menu key BUS TYPE to choose the
BUS type for the display and the analysis. The BUS type
determines the bus structure and is organized differently
depending on serial vs. parallel or the number of data
and clock signals. The universal knob allows you to se-
lect 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.
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. The
leftsideofthetablecontainsthebitsinxedsequence,
beginning at the top with D0 (= LSB). The universal knob
allows you to assign a real logic channel to the selected
BUSbit.Theallocationisnotsubjecttorestrictions;you