- From: Frank Mori Hess <fmhess_at_users.sourceforge.net>
- Date: Sun, 11 Jan 2004 20:45:28 -0500
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Sunday 11 January 2004 05:54 pm, David Carr wrote: > I have a NI AT-MIO-16E-2 500ksps analog aquisition card. This card is > supported under the ni_atmio driver. The card has an internal 2048 > sample buffer and I would like to use it for continuous sampling at > 500ksps. Is the EISA bus (using DMA I assume) capable of sustaining > this rate without dropping samples? I understand the bus bandwidth is > high enough but will there be lost samples say while the DMA controller > is being reprogrammed? (The buffer will only hold 4ms worth of > samples.) I'm just trying to determine whether or not this type of > aquisition will be possible. FYI the hardware is a K6-2 450mhz and its > only other task is to send the samples out the ethernet interface. > The driver doesn't support isa dma. It should probably be able to do it (at least the cvs version of comedi) using plain old pio though. It will eat about 50% of your cpu, as in my experience pio tops out at about 1MHz on isa (or pci) independently of cpu. - -- Frank -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQFAAfw45vihyNWuA4URAqdFAKCkt9Lk6Z+WH/hxJDm/GvFCuHTdegCgovik mLh7ZtBO/3FrmCIVi0CdZO0= =T+/9 -----END PGP SIGNATURE-----
Received on 2004-01-12Z01:45:28