Chapter 8 Interrupt ControlDAQ-STC Technical Reference Manual8-2 ©National Instruments Corporation8.3 Pin InterfaceTable 8-1 lists the I/O signals relevant to the ICM.Pin Type Notation:ID TTL input, pull down (50 kΩ)OD18U Output open drain, 24 mA sink, pull up (50 kΩ)Table 8-1. Pin InterfacePin Name Type DescriptionIRQ_IN<0..1> ID Individually Programmable Polarity General-PurposeInterrupt Inputs<0..1> to the DAQ-STC—Theseinputs are enabled/disabled via registers in theDAQ-STC and passed on to the two interrupt groupsin the DAQ-STC. Related bitfields:Pass_Thru_i_Interrupt_Enable,Pass_Thru_i_Second_Irq_Enable,Pass_Thru_i_Interrupt_Polarity.IRQ_OUT<0..7> OD18U Programmable Polarity Interrupt Outputs<0..7> fromthe DAQ-STC. Two IRQ_OUT lines can be assertedsimultaneously by the two interrupt groups in theDAQ-STC when an unmasked interrupt condition istrue. Both interrupt groups can also share the sameIRQ_OUT line, in which case only one IRQ_OUTline will be asserted. In addition, IRQ_OUT0 andIRQ_OUT1 can be enabled to be driven whenever anyunmasked interrupt condition is true. These twooutputs can be tied together to increase the currentsink capability as required by NuBus. Destination:CPU bus. Related bitfields:Interrupt_A_Output_Select,Interrupt_A_Output_Enable,Interrupt_B_Output_Select,Interrupt_B_Output_Enable,Interrupt_Output_Polarity,Interrupt_Output_On_3_Pins.SEC_IRQ_OUT_BANK0 OD18U Secondary Interrupt Output for Interrupt Group A.SEC_IRQ_OUT_BANK1 OD18U Secondary Interrupt Output for Interrupt Group B.
