Define trigger generator waveforms (TRIGWF)
 | Caution
Do not use TRIGWF in any new code applications that drive RVP10. Use the interactive trigger setup procedure to define RVP10 triggers and timing. See Burst pulse timing plot (Pb). |
 |
TRIGWF is obsolete. It is included for backward compatibility with RVP6. The code is disabled by default. |
RVP10 has a built-in trigger generator that can synthesize 6 independent digital output waveforms, each having arbitrary shape and being active anywhere in a window centered around zero-range.
The trigger outputs can be defined by a 2048-word by 6-bit table which is loaded from the user computer. The patterns are automatically read from the table and output to the 6 trigger lines during each radar pulse.
The outputs can be used for transmitter triggers, scope triggers, range strobes, PLL gates,
and so on. The writable waveform table is unique, in that the detailed timing of trigger and
related control signals can be easily adjusted in software, without having to resort to
reprogramming PROMs. This makes it possible for user software to edit the
trigger timing interactively.
Trigger waveforms are loaded using the
TRIGWF command. Four bits in the command word (PW0
... PW3) select which pulse widths receive the new waveforms. On power-up, the
pulse widths are initialized to user-selected waveforms.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
---------------------------------------------------------------
| | | | | | | | | | | | | | | | |
| |PW3|PW2|PW1|PW0| | 0 1 1 0 1 | Command
|---------------|---|---|---|---|------------|-------------------| 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
---------------------------------------------------------------
| | | | | | | | | | | | | | | | |
| H | | Transition Point of POLAR0 Control Line | Input 1
|-------------------|--------------------------------------------| The H bit defines the sense of the control line when horizontal polarization
is selected.
Inputs 2 ... 2049, indicate bits output every 7.195 MHz and Input
1025 corresponds to the time at which data at range zero are sampled.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
---------------------------------------------------------------
| | | | | | | | | | | | | | | | |
| | Bits for –142.22 usec | Input 2
|----------------------------------------|-----------------------|
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
---------------------------------------------------------------
| | | | | | | | | | | | | | | | |
| | Bits for zero range | Input 1025
|----------------------------------------|-----------------------|
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
---------------------------------------------------------------
| | | | | | | | | | | | | | | | |
| | Bits for +142.08 usec | Input 2049
|----------------------------------------|-----------------------|