26 Keysight 34950A User’s Guide
Set the handshake mode.
You must use synchronous handshaking mode.
You can use either an internal or external strobe (clock) to pace the outputs.
Handshaking is described in more detail on page 17.
Set the trigger source.
By default, the trigger source is set to use a software
trigger. You can also use one of the interrupt lines (see page page 30) as a trigger
source.
Set the number of times to output the trace.
Each trace can be output once,
multiple times, or infinitely. The SOURce:DIGital:MEMory:NCYCles command
sets the number of times to output the trace. If not set to infinite, you can output
the trace from 1 to 255 times (the output is controlled by the handshake).
Load the trace(s) into memory.
Named traces are downloaded using the
TRACe:DATA:DIGital command. The channel width used should match the
width of the channel set in step 1. If you change the width of a bank, all traces in
memory are cleared. The trace names must start with a character and may be up
to 12 characters in length. The trace name used must be unique to the bank. Up
to 32 traces may be downloaded (up to the maximum memory).
Traces can be added or deleted only when memory is disabled. Memory output
cannot be enabled unless the bank has a trace assigned to it.
For example, the following commands load two traces into memory for bank 1 of a
module in slot 1. In this example, each byte of the LWORd to output is sent as a
separate byte.
TRAC:DATA:DIG:LWOR (@1101), MyTrace1, 255, 200, 128, 0
TRAC:DATA:DIG:LWOR (@1101), MyTrace2, 254, 192, 64, 32
You can also send trace data in IEEE-488 block format using this command.
The 34950A also has two special built-in traces for your use. You can generate
and download a count-up trace and a walking 1’s pattern using the
TRACe:DATA:DIGital:FUNCtion command. See the Programmer's Reference
Help file for more details.
You can generate a count-down or walking zero pattern by inverting the data
line polarity.
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