Buffer FIFO output DAC on PCI-4461 and USB-4431
I remember correctly, there is a FIFO buffer on the output DAC of a PCI-4461 to approximately 2048 samples. Am I remembering correctly? What is the output DAC FIFO on the USB-4431?
Hi jmoses,
The FIFO on the 4461 is actually 1023 * samples (found in the page on record).
The 4431 does not actually list a FIFO size in the page on record, but any device that handles output clocked by material will have some sort of FIFO to avoid running out of data to generate. By using the Output.OnBrdBufferSize property node returns 4095 * samples - it is logical that FIFO would need to be bigger, given the higher latency of USB transfers. Unless you use on-board regeneration, the FIFO size should not typically be a concern since it is designed to be large enough to accommodate a continuous generation to the full rate of the device specced.
Action request corrective number 149512 filed with respect to the issue of the missing documentation on our USB DSA devices - I apologize for any inconvenience.
* If you are interested, the reason that the FIFO is not an even number of samples is the software limits the size of buffer to one less than the actual hardware buffer. This is necessary for us to be able to detect the difference between an empty FIFO and a State full of PEP (we use a reading and a pointer to write to manage the transfer of data in and out of the FIFO - we can say that the buffer is empty when the two pointers are equal and complete when the write pointer is a sample behind the reading pointer).
Best regards
John
Tags: NI Hardware
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