346 Keysight CXG, EXG, and MXG X-Series Signal Generators Programming Guide
Creating and Downloading User–Data Files
Pattern RAM (PRAM) Data Downloads
Pattern RAM (PRAM) Data Downloads
This section contains information to help you transfer user–generated PRAM
data from a system controller to the signal generator’s PRAM. It explains how
to download data directly into PRAM and modulate the carrier signal with the
data.
The control bits included in the PRAM file download, control the following
signal functions:
—bursting
— timing signal at the EVENT 1 rear panel connector
—data pattern reset
PRAM data downloads apply to only real–time Custom modulation formats.
PRAM files differ from bit and binary user files. Bit and binary user files (see
page 327) download to non–volatile memory and the signal generator loads
the user file data into PRAM (volatile/waveform memory) for use. The signal
generator adds the required control bits when it generates the signal.
A PRAM file downloads directly into PRAM, and it includes seven of the
required control bits for each data bit. The signal generator adds the remaining
control bits when it generates the signal. You download the file using either a
list or block data format. Programs such as MATLAB or MathCad can generate
the data.
This type of signal control enables you to design experimental or proprietary
framing schemes.
After selecting the PRAM file, the signal generator builds the modulation
scheme by reading data stored in PRAM, and constructing framing protocols
according to the PRAM file data and the modulation format. You can
manipulate PRAM data by changing the standard protocols for a modulation
format such as the symbol rate, modulation type, and filter either through the
front panel interface or with SCPI commands.
Understanding PRAM Files
The term PRAM file comes from earlier Keysight products (E443xB ESG). PRAM
is another term for waveform memory (WFM1), which is also known as volatile
memory. This means that PRAM files and waveform files occupy the same
Refer to Table on page 322 for a list of applicable signal generators.
If you encounter problems with this section, refer to “Data Transfer
Troubleshooting” on page 384.
To verify the SCPI parser’s responsiveness when remotely using the :MEM:DATA SCPI command
to upload files, the file’s upload should be verified using the *STB? command. Refer to the SCPI
Command Reference.
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