Register Descriptions Chapter 4SCXI-1120 User Manual 4-4 © National Instruments CorporationBit Name Description (continued)5 RTEMP Read Temperature – This bit determines whether theselected channel output or the MTEMP signal is drivenonto the MCH0± pins of the rear signal connector. IfRTEMP is cleared to 0, the selected channel output is usedas the module output. If RTEMP is set to 1, the MTEMPsignal is used as the module output. The module outputwill only be driven when FOUTEN* is cleared to 0, orSCANCON is active (low) while SCANCONEN* iscleared.4 RSVD Reserved – This bit should always be written to 0.3 SCANCLKEN Scan Clock Enable – This bit determines whetherMUXCOUNTER will increment on each clock signal (theclock source is determined by CLKSELECT), or keep itsloaded value. If SCANCLKEN is set to 1,MUXCOUNTER will be clocked during scans. IfSCANCLKEN is cleared to 0, MUXCOUNTER will not beclocked.2 SCANCONEN Scan Control Enable – This bit, when set to 1, enables theSCANCON signal.1 AB0EN Analog Bus 0 Enable – This bit determines whether AnalogBus 0 on the SCXIbus drives MCH0 on the rear signalconnector. If AB0EN is cleared to 0, Analog Bus 0 doesnotdrive MCH0. If AB0EN is set to 1, Analog Bus 0 + drivesMCH0+ through a buffer and a Analog Bus 0 - is connectedto MCH0-.0 FOUTEN* Forced Output Enable – This bit determines whether themodule will drive the MCH0± pins on the rear signalconnector with either the selected channel output or theMTEMP signal, depending on the state of RTEMP. IfFOUTEN* is cleared to 0, the MCH0± pins will be driventhrough a buffer by the selected channel output or theMTEMP line. If FOUTEN* is set to 1, the MCH0± pinswill not be driven by the selected channel output orMTEMP, unless SCANCON is active (low) and theSCANCONEN bit is cleared. If the selected channel outputor MTEMP is driving the output buffer, it will drive AnalogBus 0 if AB0EN is set. If nothing is driving the outputbuffer, the SCXI-1120 output will saturate.
