Memory Structure ESG Family Signal Generators
Memory Types
5-2
User’s Guide
Memory Types
The signal generator’s memory, depending on the options present, comprises:
Default Memory
stores FIR filter coefficient data, modulation data, user file bit editor data,
and instrument state data.
Firmware Memory
stores the code used by the signal generator to manipulate internal data
and the internal hardware.
Motherboard RAM
stores data such as persistent state information, initialized and uninitial-
ized variables, boot ROM, default directories, and default buffer.
Arbitrary Waveform Generator (Option UND) contains:
• ARB memory (RAM-based, volatile) holds the current data for playback
using the arbitrary waveform generator.
• NVARB memory (FLASH RAM-based, nonvolatile) stores arbitrary
waveform data for subsequent transfer to ARB memory for playback.
• Sequencer memory, which contains data related to waveform segments,
waveform sequences, repetition, and marker settings.
Data Generator (Option UN8/9)
contains pattern RAM memory. Data loaded into PRAM is read by the
real-time I/Q baseband generator to produce the desired output. PRAM
data includes the modulating data bits plus control information such as
burst state, EVENT 1 output, and pattern reset.
Baseband Generator (Option UN8/9) contains the burst shape memory.
IQ
4 MB SRAM
Default Memory Firmware Memory Motherboard RAM
Arbitrary Waveform Generator
IQ
4 MB FLASH
ARB Memory NVARB Memory Sequencer Memory
Data Generator
PRAM: 1 MB (Opt. UN8)
or
8 MB (Opt. UN9)
Baseband Generator
Burst Shape Memory
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