Hi,
I'm trying to use the watermarks to end the GPIF2 data transfers.
My FX3 design is a 32b slave FIFO with flagA as ready/empty and flagB as watermark (both thread dependent). When accessing the FX3 in RD mode (U2P), the watermark is working as expected and everything goes great.
When accessing in WR mode (P2U), for some reason, the watermark comes earlier than what I would expect. I'm sending a whole FX3 buffer (16KB) from my FPGA and counting the amount of data sent (in 32b words), so for now the watermark flag it is not at the FPGA side.
The watermark for P2U access is configured with a value of 6, so, according to the documentation, the flag should go down when there are 2 samples left to be sent. At the FPGA I'm double registering the watermark, so I'm expecting the watermark to become low when there is no more data to be sent. However I still see that, even after the 2 cycle delay, the watermark does not arrive where I am expecting it.
I'm including the chip scope capture so you can have a look, as well.
The configuration for the FX3 watermark is as follows:
Thanks in advance.
