Spectrum digitizerNETBOX DN2.44 Series Hardware Manual page 6

Acquisition modes ........................................................................................................... 85
Overview .......................................................................................................................................................................... 85
Setup of the mode ........................................................................................................................................................ 85
Commands ........................................................................................................................................................................ 86
Card Status.................................................................................................................................................................. 87
Acquisition cards status overview ................................................................................................................................... 87
Generation card status overview .................................................................................................................................... 87
Data Transfer ............................................................................................................................................................... 87
Standard Single acquisition mode ........................................................................................................................................ 90
Card mode .................................................................................................................................................................. 90
Memory, Pre- and Posttrigger ......................................................................................................................................... 90
Example ...................................................................................................................................................................... 90
FIFO Single acquisition mode .............................................................................................................................................. 91
Card mode .................................................................................................................................................................. 91
Length and Pretrigger .................................................................................................................................................... 91
Difference to standard single acquisition mode................................................................................................................. 91
Example FIFO acquisition .............................................................................................................................................. 91
Limits of pre trigger, post trigger, memory size ....................................................................................................................... 92
Buffer handling .................................................................................................................................................................. 93
Data organization .............................................................................................................................................................. 96
Sample format ................................................................................................................................................................... 96
Converting ADC samples to voltage values ...................................................................................................................... 97
Applying correction factors when using special clock mode ............................................................................................... 97
Clock generation ............................................................................................................. 98
Overview .......................................................................................................................................................................... 98
Clock Mode Register..................................................................................................................................................... 98
The different clock modes .............................................................................................................................................. 98
Details on the different clock modes...................................................................................................................................... 99
Standard internal sampling clock (PLL)............................................................................................................................. 99
Minimum internal sampling rate ..................................................................................................................................... 99
Clock Setup Granularity and Divider (Special Clock Mode) ............................................................................................... 99
Using Quartz2 with PLL (optional, M4i cards only).......................................................................................................... 101
Oversampling ............................................................................................................................................................ 101
External clock (reference clock) .................................................................................................................................... 101
PXI Reference Clock (M4x cards only) ........................................................................................................................... 102
Trigger modes and appendant registers ........................................................................ 103
General Description.......................................................................................................................................................... 103
Trigger Engine Overview................................................................................................................................................... 103
Trigger masks .................................................................................................................................................................. 104
Trigger OR mask ........................................................................................................................................................ 104
Trigger AND mask...................................................................................................................................................... 105
Software trigger ............................................................................................................................................................... 106
Force- and Enable trigger .................................................................................................................................................. 107
Trigger delay ................................................................................................................................................................... 107
Main external window trigger (Ext0)................................................................................................................................... 108
Trigger Mode............................................................................................................................................................. 108
Trigger Input Termination............................................................................................................................................. 108
Trigger Input Coupling ................................................................................................................................................ 109
Secondary external level trigger (Ext1) ................................................................................................................................ 109
Trigger Mode............................................................................................................................................................. 109
Trigger level............................................................................................................................................................... 109
Detailed description of the external analog trigger modes ............................................................................................... 110
Channel Trigger ............................................................................................................................................................... 114
Overview of the channel trigger registers....................................................................................................................... 114
Channel trigger level................................................................................................................................................... 115
Detailed description of the channel trigger modes........................................................................................................... 117
Multi Purpose I/O Lines..................................................................................................................................................... 123
Programming the behavior........................................................................................................................................... 123
Using asynchronous I/O ............................................................................................................................................. 124
Special behavior of trigger output................................................................................................................................. 124
Mode Multiple Recording ............................................................................................... 125
Recording modes ............................................................................................................................................................. 125
Standard Mode.......................................................................................................................................................... 125
FIFO Mode ................................................................................................................................................................ 125
Limits of pre trigger, post trigger, memory size ..................................................................................................................... 126
Multiple Recording and Timestamps .............................................................................................................................. 127
Trigger Modes ................................................................................................................................................................. 127
Trigger Counter .......................................................................................................................................................... 127
Programming examples..................................................................................................................................................... 128
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