User's Manual Part 2

Host Computer Commands
RVP8 User’s Manual
May 2003
6–45
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| | 0 0 0 0 1 1 0 1 1 1 1 1 | Command
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| Signed trigger slew in hundredths of microseconds | Input 1
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6.25 Hunt for Burst Pulse (BPHUNT)
This command starts up the internal procedure to hunt for a missing burst pulse when we are
uncertain of both its time and frequency. Depending on how the hunting process has been
configured in the Mb menu, the whole procedure may take several seconds to complete. The
RVP8’s host computer interface remains completely functional during this time, but any acquired
data would certainly be questionable. GPARM status bits in word #55 indicate when the hunt
procedure is running, and whether it has completed successfully.
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| |Now| 0 0 0 0 1 1 1 1 1 1 1 1 | Command
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Now Forces the hunt procedure to be started even if the burst pulse is already present.
Normally the procedure will only be started when the burst pulse is missing at the
time BPHUNT is given.
6.26 Configure Phase Modulation (CFGPHZ)
This command configures the RVP8 phase control output lines, which determine the relative
phase of each transmitted pulse. In some cases the phase sequence that is chosen will also have
side effects elsewhere in the processor, e.g., different algorithms may be used in Random Phase
mode according to the transmit sequence that is requested.
Some of the phase sequences chosen by CFGPHZ also expect additional arguments to have been
supplied by the XARGS command. Phase sequences are expressed as a list of N 16-bit binary
angles representing the desired phase sequence. The sequence is assumed to be periodic with
period N. The Mz command defines the correspondence between phase codes and phase angles,
and is described in Section 3.3.8.
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| | PhSeq | 0 0 0 1 0 0 0 1 1 1 1 1 | Command
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PhSeq=0 Selects No Modulation. The RVP8 outputs a constant default phase request as
defined in the Mz menu.
PhSeq=1 Selects a Random Phase sequence. This is also the default phase modulation that
will be output following power-up. From the set of valid phase codes that are de-
fined in the Mz setup section, a random code is automatically chosen for each
pulse. Each code has an equal probability of being chosen each time, and the