Re: transfer units

["M.Stein" <matthias@gom.com>]

Hi Will!

On Tue, 11 Apr 2000, Will Lockhart wrote:

> Matthias,
> 
> I have a simple question about the driver. When does it start
> transferring frame data to the host? Does it wait until the entire
> image has been acquired, or does it start transferring data at the
> start of the frame?

Every 64k of the frame an aquisition address interrupt is generated and
the data are pagewise transfered. This is an useful compromise between
interrupt generation and time delay (and also the minimal possible value
at the IC-PCI). But PC-DIG CAN generate a address interrupt at EVERY 4k
of the frame. But this means you don't use the hardware scatter-gather of
the board, because you transefer every frame by hand. If you are
interested in this short time delay between acquisition and processing,
I can expain you, which code fragments to change. 

> 
> Will
> 

					matthias