High-Speed Digital Real-time Hardware Compare (LabWindows/CVI)

The NI-HSDIO driver software version 1.4 and later adds new digital ATE features to the NI 6552 and NI 6551 digital waveform generator/analyzers. One of these new features, real-time hardware comparison, allows you to compare acquired response data with some known expected response. The data comparison, which historically had to be performed in software after the acquisition, now occurs on-the-fly in the digital board's FPGA on a per-sample basis.

This LabWindows/CVI example illustrates how to configure the generation and acquisition session of the digital board using the NI-HSDIO C functions. Both sessions must be active since the board must generate and acquire data on a per-clock cycle (i.e. per-sample) basis. The logic-states in the waveform dictate whether the board generates data or acquires and compares data. A 0 or 1 command the board to generate a logic-low or logic-high while a H, L, or X indicate that the board must acquire and compare the data on that clock cycle.

The example programmatically generates a waveform to be output on 10 channels and places random errors into the expected response. The waveform is then acquired into the other 10 channels where it is automatically compared with the expected response. Once the generation is complete, the data surrounding each error is fetched based on the sample number(s) that contained an error.

External connections needed for this example:
- Data Active Event (PFI1) jumped to Start Trigger (PFI2)
- Exported generation clock (DDC ClockOut) jumped to Acq clock (Strobe)
- Generation channels jumped to acquisition channels
(for example,
Generation Channels Used: 0,1,2
Acquisition Channels Used: 4,5,6
Required Connections: 0->4, 1->5, 2->6)

Requirements

Filename: dighardwarecomparelv71.zip

Software Requirements

Application Software: LabWindows/CVI Full Development System 7.1
Language(s): C

Hardware Requirements

Hardware Group: Digital I/O (DIO)
Hardware Model: PXI-6552, PXI-6551
Driver: NI-HSDIO 1.5, NI-HSDIO 1.4

Filename: dighardwarecomparelv8.zip

Software Requirements

Application Software: LabWindows/CVI Base Development System 8.0, LabWindows/CVI Base Development System 7.1
Language(s): C

Hardware Requirements

Hardware Group: Digital I/O (DIO)
Hardware Model: PXI-6551, PXI-6552
Driver: NI-HSDIO 1.4, NI-HSDIO 1.5

Reader Comments | Submit a comment »