The maximum DMA buffer size is 64KB(Kilo Bytes) - 16 Bytes. what is the interface you ae using ( slave FIFO or GPIF) ? Are you using any flow control ?
Am I right in thinking that I can assign multiple buffers to a DMA channel to acheive > 64k-16 ?
With a 3014 part, I have ~328k RAM spare which plan use as 43 x 8K buffers to assign to a single DMA channel. I have a 32k FIFO in the FPGA that can buffer the data stream while the FX3 switches to the next free buffer (~0.8us). My data rate is 60MB/s so with 328k + 32k I get 6ms worth of buffering before an overflow if Windows stops the Cypress USB driver from running.
From my observations so far I'm seeing hardly any buffer being required. This is running on a dual core i7 laptop and is only a sample size of 1, hence my open question to see what experience other users have had.
Yes, The maximum size of a single DMA buffer is 64K-16 bytes. You can implement multiple buffers. However it should not be more than the space that you allocate in the RAM for DMA buffer. Just make sure of that.