Spectrum Brands MI.61XX 用户手册

44

MI.61xx Manual

General description

Standard generation modes

The generated data is replayed from the on-board memory. These modes allows generating waveforms at very high sample rates without the 
need to transfer the data into the board’s on-board memory at high speed. These modes are running totally independent from the PC and 
don’t need any processing power after being started.

The singleshot mode is the most simple output mode for the 
Spectrum boards. It simply replays the programmed data 
once after detecting the trigger event. The amount of memory 
to be replayed can be programmed by software. Any trigger 
source can be used to start the output. If output should be star-
ted immediately one can simply use the software trigger ca-
pabilities of the board.

After detetcting the trigger event the programmed data is re-
played continuously. On reaching end of the programmed 
memory size the output starts again with the first sample. The-
re’s no gap in output when switching from the last sample to 
the first sample. The output runs until the users stops it by soft-
ware. If not stopped the continuous output runs independent 
of any other PC components until the system is shut off.

The posttrigger mode is normally only used when starting the 
output board together with an acquisiton board.
The data is written to a programmed amount of the on-board 
memory (memsize). After starting the board the output will im-
mediately start and continue to loop. At this point the mode is 
similar to the continuous mode explained above. After detec-
ting a rigger event, a certain programmed amount of data is 
replayed (posttrigger) and then the replay finishes automati-
cally.

The memory size register defines the length of the data to be replayed. Depending on the mode used this data is replayed once or conti-
nuously.

The maximum memsize that can be use for replaying is of course limited by the installed amount of memory and by the number of channels 
to be replayed. The following table gives you an overview on the maximum memsize in relation to the installed memory.

SPC_SINGLESHOT

41000

r/w

Write a „1“ to enable the singleshot mode (a „0“ disables it)

SPC_SINGLESHOT

41000

r/w

Write a „0“ to disable the singleshot mode

SPC_OUTONTRIGGER

41100

r/w

Write a „1“ to enable the continuous mode

SPC_SINGLESHOT

41000

r/w

Write a „0“ to disable the singleshot mode

SPC_OUTONTRIGGER

41100

r/w

Write a „0“ to disable the continuous mode

SPC_MEMSIZE

10000

r/w

Sets the memory size in samples per channel.

SPC_POSTTRIGGER

10100

r/w

Sets the number of samples to be replayed after the trigger event has been detected.