How to clear host to target fifo ni community national. You can check if data is properly received by wiring indicators to the inputs of your fifo write in the fpga program. Module, and the labview fpga module you need for the c. To design a robust application, ni recommends that you. If you later restart labview, you can reconnect to the. An fpga fifo acts like a fixed length queue, where the first. The drivers on the fpga write data to a fifo first in, first out data stack. As an example, i have a 1d array containing 10x2000 elements stored inside the host side buffer. If you use the invoke method function to read dma fifos, the function might. Avoiding buffer errors in dma applications fpga module support. In crio rt im getting data from ethernet and i pass this data to fpga for logic output via host to target fifo. Read fifo method labview 2018 fpga module help national.
You can use only slice fabric for fifo control logic when the fifo is in a clock domain that might be stopped during reset, including all external clock domains. Fpga fifo state after i abort, run, start, reset, or write. Timeout specifies the time, in number of clock ticks, that the method waits for available data in the fifo if the fifo is empty. Basic elements fpga vis flexrio help national instruments.
A complete monitoring tool for machining data acquisition. Labview fpga module user manual national instruments. Rightclick the system reset input of the fpga io node and. The fifo method node configured with the read or write methods automatically start dma data transfer. The start invoke method begins dma data transfer between the fpga target and the host computer. Dear all, i have a question regarding to fpga fifo, specifically dma from host to target fpga. Fpga fifo reset behavior when you target an fpga device emulator, fpga fifos reset when the vi is stopped and then started again. When you execute a vi on an fpga target and stop and restart the vi, buffers do not reset, which means data remains in the. At the fpga side, i want to use host to targetread to read fixed amount of elements from the host side. To reset the fifo, rightclick the fpga target in the project explorer window and select reset from the shortcut menu. Theyre very useful, especially for buffering up data and crossing clock domains inside. Use this book as a reference for information about which fpga io functions, io resources. To detect when a buffer did underflow, check the fifo.
Theyre very useful, especially for buffering up data and crossing clock domains inside of your vhdl or verilog design. Display the counter register value on the leds of an ni compactrio module. This manual describes the labview fpga module software and techniques for building applications in labview with the. Objects inside the singlecycle timed loop cannot block execution. The labview fpga module compiles the labview vi to fpga hardware. Reset will reset the fpga vi on the fpga target to the default state of the vi. This might happen because you arent actually acquiring data, or updating data in your fpga program. This method sets the fpga vi controls and indicators to their default states, sets uninitialized shift registers to their default values, clears fifos, and sets global. This book provides functions and procedures that enable host vis to communicate with. If you have an fpga target, you can use the labview fpga interface. Fifo error codes fpga module labview 2018 fpga module. When you control an fpga vi using programmatic fpga interface communication, use the close fpga vi reference function with the close and reset shortcut menu option selected or the invoke method with the reset method selected to reset fpga fifos. Create a simple event counter in labview fpga to count rising digital edges. To reset the entire fifo, assert the reset signal, and call the labview fpga fifo clear method.