Advanced Table Mode (Xrf); Operational Principle - MOGlabs ARF021 Manual

9. Advanced table mode (XRF)

9.1 Operational principle

has access to an advanced table mode with increased func-
The XRF
tionality, flexibility and significantly faster execution than normal
( SIF ) table mode. Due to the added complexity, it is strongly recom-
mended that users be familiar with simple table mode before reading
this chapter.
Advanced table ( TPA
allel DDS interface. This allows one parameter to be updated at
the maximum supported rate, currently 16 ns per instruction. Due
to limitations of the
be modified via PIF
the slower rate supported by the serial interface (
neither external modulation nor
There are therefore two kinds of instructions in advanced mode:
parallel and serial. Parallel instructions allow a single parameter to
be updated rapidly, whereas serial instructions are preloaded into
the serial interface and then activated in a subsequent command.
This load/activate cycle allows changes to be made to the parallel
parameter without having to wait for the serial load to complete.
Advanced mode also supports a more extensive selection of loop
options, including the ability to increment the parallel parameter for
piecewise linear interpolation. This is advantageous for generating
smooth envelopes with only a few table instructions.
The FPGA supports
(particularly on the
The MOGL abs B3120
the high-speed bus as it has matched track lengths to minimise
relative delay between the signals.
) mode performs table execution via the par-
AD9910 DDS devices, only one parameter can
, and the other parameters must be updated at
can be used in
PID
I/O at the full update rate, but the rise-time
DE15 connector) must be taken into account.
break-out board is recommended when using
73
SIF ). Furthermore
mode.
TPA