How to handle Interrupts in PXIe-6363

[jeet]

Hello,

I am working on a PXI tester to test ASIC chips. In the tester, I am using PXIe-6363 card and NI USB-8452 SPI module to talk to ASIC chips. The ASIC chip sends an interrupt signal to the PXIe-6363 when its finished with a certain measurement, for eg. an ADC voltage measurement. Upon receiving this interrupt signal from ASIC, the PXI tester running LabVIEW needs to get that measured value through SPI (NI 8452) from ASIC.

I have the following questions regarding this set up:

1. Can I connect the Interrupt signal from ASIC to any PFI line on PXIe-6363 so that when the interrupt pulse occurs, the tester can respond to that interrupt by initiating SPI Comm through Ni-8452 module?

2. If so, how can I do coding in LabVIEW to respond to that interrupt pulse on PFI line?

Thanks,

Jeet

[Joseph-S]

Hi Jeet,

What kind of voltage levels are you expecting from the ASIC? Is it TTL or CMOS level logic? As long as the logic level is compatible with the Digital I/O of your device (you can check the specs here: https://www.ni.com/docs/en-US/bundle/pxie-6363-specs/page/specs.html), it should definitely be possible to trigger a software event off an interrupt signal which is fed in to the PFI lines. Please take a look at this Developer Zone tutorial: https://www.ni.com/en/support/documentation/supplemental/21/getting-started-with-daqmx-daqmx-events...., particularly the section at the bottom regarding software events. Figure 3 shows how you would trigger the execution of code within a timed loop off a PFI line. Let me know if this helps in getting you started.

[jeet]

Hi Joseph,

The logic level of the interrupt signal (digital pulse) coming from ASIC would be at 3.3V. It is higher than the Vih of the digital inputs. I will read the link that you sent me and try to understand how to trigger software events based on a digital interrupt pulse.

Thanks,

Jeet