johns@calvin.spp.cornell.edu (John Sahr) (01/17/90)
We are building a data acquisition device that will use the SCSI interface to transfer its data out (and operating parameters in). This device can be implemented as a sequential access device (like a tape), as opposed to a random access device, making its design simpler than a disk interface. Our question: The SCSI standard does not require that a sequential access device support disconnect/reselect (and related commands such as save and restore data pointer). Our largest data transfer block will be about 64kbytes (adjustable downward to a minimum of 16kbyte if need be); at the top speed we envision, we could be generating 200byte/sec, thus up to 3 blocks per second may need to be transferred. We will support synchronous operation. Because the disconnect/reselect adds some complexity to our design, we would like to avoid it, if possible. Is this reasonable or possible for the ds3100? In particular, for the purposes of the ds3100, must we support disconnect/reselect? (in case you wondered: this is not a commercial product. We are building a timing generator and digitizer for a small atmospheric radar used by the Space Plasma Physics Group at Cornell University). praises, flames, info, and inquiries by email (please) to johns@alfven.ee.cornell.edu 607 255 8298 -- John Sahr, | Electrical Engineering - Space Plasma Physics johns@alfven.spp.cornell.edu | Cornell University, Ithaca, NY 14853