2-2 Principles of Operation KPCI-3101 — KPCI-3104 Series User’s ManualThis section describes the analog input, analog output, digital I/O, and counter/timer features ofthe KPCI-3101–4 Series board. To frame the discussions, refer to the block diagram shown inFigure 2-1. Note that bold entries indicate signals you can access.Figure 2-1Block diagram of the KPCI-3101–4 series boardsAnalog input featuresThis section describes the features of the analog input (A/D) subsystem, including the following:• Input resolution• Analog input channels• Input ranges and gains• A/D sample clock sources• Analog input conversion modes• Trigger sources and trigger acquisition modes• Data formats and transfer• Error conditionsTrigger/ClockLogicA/D Counter,24-bitsTScan Counter24-bitExt A/D ClockExt TTL Trig20 MHz ClockA/D ClkAnalog In 16 Channel MuxCh. SelGain Amp(1, 2, 4, 8)ADCTristate Buffers1 kSampleInput FIFOPCI Bus InterfacePCI BusGain SelA/D ClkDIO Ports Aand BInput SelCh. Sel1 K EntryCGL FIFOCGL Reg.ChannelParameterReg.Gain SelInput SelBidirectional8-bit LatchBidirectional8-bit Latch20 MHzClockDIO Port B[7:0]DIO Port A[7:0]User Clk [3:0]User Gate [3:0]User Out [3:0]4 UserCounter/Timers,16-bit ea.DiscardsampleMultiplyingDAC*MultiplyingDAC*AnalogOutput 1AnalogOutput 0DIO Port C [6:0]*DACs not included on KPCI-3101,or KPCI-3103 boards.SW_Clk1SW_Clk0Ser_DaSer_Clk
