Extended memory from FPGA to RT controller

[pzucchel]

Hi,

i am currently experimenting on the more efficient way to transfer data (16K array with 16bit words) from the FPGA extended memory to the RT controller. Up to now, single words transfers and interrupt handshaking appears to me the best way....any suggestions? the creation of an intermediate array control, for example, has an enormous compilation time and i doubt is the more efficient way. I am not able to map a control onto the extended memory directly.....Please let me know of any suggestion,

Best Regards

Piero Zucchelli

[dkb]

In LabVIEW 7.1, the way you are suggesting is in most cases the fastest way to send data to a host machine from the FPGA. You may be able to speed it up slightly by creating an intermediate array of 16 to 32 elements so the synchronization overhead is limited to a chunk of memory instead of a per element basis.

In LabVIEW 8.0, FPGA FIFOs are capable of using DMA to send data directly from the FPGA to the host and is orders of magnitude faster than the above method.