Re: [Discuss-gnuradio] FX2 TX DMA Transfer Question

[Eric Blossom]

On Thu, Apr 26, 2007 at 01:56:10PM -0400, Brian Padalino wrote:
> When the FX2 detects the have_space pin on the FPGA, does it transfer
> 1 entire buffered USB packet to the FPGA, then re-check the have_space
> pin?

Yes.

> Would it be reasonable to assume a 1 clock delay between the last byte
> of one 512-byte packet being written to the FPGA and the first byte of
> a second 512-byte packet being written to the FPGA?

Yes.  That shouldn't be a problem.  There's software inside the FX2
that polls the pin.  You've got at least 100 ns between packets,
probably more.

Eric