Spectrum Brands MI.61XX manual Trigger modes and appendant registers, Software trigger

Page 58

General Description

Trigger modes and appendant registers

 

 

Trigger modes and appendant registers

General Description

Concerning the trigger modes of the Spectrum MI, MC and MX D/A boards, you can choose between three external TTL trigger modes and one internal software trigger. This chapter is about to explain the different trigger modes and setting up the board’s registers for the desired mode. Every analog Spectrum board has one dedicated SMB connector mounted in it’s bracket for feeding in an external trigger signal or outputting a trigger signal of an internal trigger event. As only one connector is available for external trigger I/O, it is not possible to forward the external trigger signal that is fed in to another board. If this is necessary, you need to first split up the external trigger signal.

Software trigger

The software trigger is the easiest way of triggering any Spectrum board. The acquisition or replay of data will start immediately af- ter starting the board. The only delay results from the time the board needs for its setup.

Register

Value

Direction

Description

SPC_TRIGGERMODE

40000

r/w

Sets the triggermode for the board.

 

TM_SOFTWARE

0

Sets the trigger mode to software, so that the recording/replay starts immediately.

In addition to the softwaretrigger (free run) it is also possible to force a triggerevent by software while the board is waiting for an internal or external trigger event. Therefore you can use the board command shown in the following table.

Register

Value

Direction

Description

SPC_COMMAND

0

r/w

Command register of the board.

 

SPC_FORCETRIGGER

16

Forces a trigger event if the hardware is still waiting for a trigger event. Needs a base board hardware version > 7.x.

Due to the fact that the software trigger is an internal trigger mode, you can optionally enable the external trigger output to generate a high active trigger signal, which indicates when the data acquisition or replay begins. This can be useful to synchronize external equipment with your Spectrum board.

Register

Value

Direction

Description

SPC_TRIGGEROUT

40100

r/w

Defines the data direction of the external trigger connector.

 

0

The trigger connector is not used and the line driver is disabled.

 

1

The trigger connector is used as an output that indicates a detected internal trigger event.

Example for setting up the software trigger:

SpcSetParam

(hDrv,

SPC_TRIGGERMODE,

TM_SOFTWARE);

//

Internal software trigger

mode is

used

SpcSetParam

(hDrv,

SPC_TRIGGEROUT ,

1

);

//

And the trigger output is

enabled

 

 

 

 

 

 

 

 

 

 

External TTL trigger

Enabling the external trigger input is performed by one of the following external trigger modes. The dedicated register for that operation is shown below.

Register

Value

Direction

Description

SPC_TRIGGERMODE

40000

r/w

 

 

TM_TTLPOS

20000

Sets the trigger mode for external TTL trigger to detect positive edges.

 

 

 

 

 

TM_TTLNEG

20010

Sets the trigger mode for external TTL trigger to detect negative edges

 

TM_TTLBOTH

20030

Sets the trigger mode for external TTL trigger to detect positive and negative edges

If you choose an external trigger mode the SPC_TRIGGEROUT register will be overwritten and the trigger connector will be used as an input by default.

Register

Value

Direction

Description

SPC_TRIGGEROUT

40100

r/w

Defines the data direction of the external trigger connector.

 

X

If external triggermodes are used, this register will have no effect.

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MI.61xx Manual

Page 57 Page 59
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Page 57 Page 59
Contents MI.61xx English version October 5Page Introduction Hardware InstallationSoftware Driver Installation SoftwareAnalog Outputs Fifo ModeProgramming the Board Standard generation modesSynchronization Option Option Gated ReplayOption Extra I/O AppendixGeneral Information IntroductionPreface PrefaceMI.6110 MI.6111 Different models of the MI.61xx seriesIntroduction Extra I/O Option -XMF Additional optionsExtra I/O Option -XIO Starhub Introduction Additional optionsSpectrum type plate Block diagram Technical Data Hardware informationHardware informationIntroduction Dynamic ParametersOrder information FilterInstalling the board in the system Hardware InstallationSystem Requirements Installing a board with digital inputs/outputs Installing a board with extra I/O Option -XMFHooking up the boards Installing multiple boards synchronized by starhubMounting the wired boards Only use the included flat ribbon cablesInstalling multiple synchronized boards Software Driver Installation Software Driver InstallationInterrupt Sharing Windows InstallationVersion control Driver Update Windows Software Driver Installation Windows Windows XP Windows XP Windows NT Adding boards to the Windows NT driverLinux OverviewDriver info Installing the deviceNow it is possible to access the board using this device Automatic load of the driverFirst Test with SBench SoftwareSoftware Overview SoftwareMicrosoft Visual C++ ++ Driver InterfaceHeader files Linux Gnu CDriver functions Other Windows C/C++ compilersNational Instruments LabWindows/CVI Include DriversFunction SpcSetData Windows Function SpcSetParamFunction SpcSetParam Function SpcGetDataSpectrum GmbH Include Driver Delphi Pascal Programming InterfaceType definition ExamplesDelphi Pascal Programming Interface Visual Basic Examples Visual Basic Programming InterfaceVBA for Excel Examples Visual Basic Programming Interface Overview Error handlingProgramming the Board Register tablesStarting the automatic initialization routine Example for error checkingInitialization PCI RegisterDate of production Installed memoryHardware version Serial numberUsed type of driver Installed features and optionsUsed interrupt line Driver versionSpcpcimemsize Powerdown and resetExample program for the board initialization SpcpciserialnoImportant note on channels selection Analog OutputsChannel Selection Disabling the outputsOutput offset Setting up the outputsOutput Amplifiers Register Value Direction Description Amplitude rangeMaximum Output Range Filter SpecificationsOutput Filters General description Standard generation modesProgramming Maximum posttrigger in MSamples Standard generation modes ProgrammingMaximum memsize Minimum and stepsize of memsize and posttrigger in samplesCommand register Starting without interrupt classic modeStarting with interrupt driven mode ProgrammingStandard generation modesValue ’start’ as a 32 bit integer value Data organizationWriting data with SpcSetData Value ’len’ as a 32 bit integer valueBit Standard Mode Standard modeSample format Background Fifo Write Fifo ModeGeneral Information Speed LimitationsTheoretical maximum sample rate PCI Bus Throughput Programming Fifo ModeSoftware Buffers 60040 Read out the number of available Fifo buffersAnalog acquisition or generation boards Fifo Mode ProgrammingBuffer processing Digital I/O 701x or 702x or pattern generator boardsSpcfifostart Example Fifo generation mode== Maxbuf SpcfifowaitProgramming Internally generated sample rate Clock generationStandard internal sample rate External reference clock Using plain quartz with no PLLExternal clocking Minimum external sample rate Direct external clockMaximum external samplerate in MS/s Example External clock with dividerCHANNEL0 CHANNEL1 CHANNEL2 CHANNEL3 Software trigger Example for setting up the software triggerTrigger modes and appendant registers External TTL triggerTrigger modes and appendant registers Example on how to set up the board for positive TTL triggerEdge triggers Positive TTL triggerPositive and negative TTL trigger Output modes Standard ModeOption Multiple Replay Trigger modesResulting start delays Trigger modes Option Multiple ReplayOption Gated Replay General information and trigger delayOption Gated Replay Value Direction DescriptionExternal TTL edge trigger Example programAllowed trigger modes Spctriggermode TmttlposChannel direction Option Extra I/ODigital I/Os Transfer DataProgramming example Analog OutputsAnalog Outputs Option Extra I/O Synchronization with option cascading Synchronization OptionDifferent synchronization options Synchronization with option starhubExample of board setup for three boards Setup order for the different synchronization optionsSet up the board parameters Write Data to on-board memory output boards only3a Define synchronization or trigger Define the boards for trigger masterExample of board #2 set as trigger master Define the remaining boards as trigger slavesDefine the remaining boards as clock slaves Define the board for clock masterExample board number 0 is clock master Arm the boards for synchronizationRead data from the on-board memory acquisition boards only Start all of the trigger master boardsWait for the end of the measurement Example for data readingSpcsyncmasterfifo Allocate the Fifo software buffers2a Write first data for output boards SpcsyncslavefifoAs trigger slaves Calculating the clock dividers Additions for synchronizing different boardsGeneral information 20xx 30xx 31xx 40xx 45xx 60xx 61xx 70xx 72xx40 MS/s Setting up the clock dividerBoard type 3122 3120 Board type 3025 3131Delay in Fifo mode Resulting delays using different boards or speedsDelay in standard non Fifo modes Additions for equal boards with different sample ratesAppendix Error CodesError name Value hex Value dec Error description AppendixExtra I/O with external connectorOption -XMF Pin assignment of the multipin connectorPin assignment of the multipin cable D14 D12 D10 Pin assignment of the internal multipin connectorExtra I/O with internal connector Option -XIO D15 D13 D11
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