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From: Eric.Thayer@cs.cmu.edu (Eric H. Thayer)
Newsgroups: comp.sys.next
Subject: Re: Data Acq on NexT??
Message-ID: <1990Dec12.143322.10808@cs.cmu.edu>
Date: 12 Dec 90 14:33:22 GMT
References: <1990Dec11.204621.29739@rodan.acs.syr.edu>
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Organization: Carnegie Mellon School of Comp. Sci.
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In article <1990Dec11.204621.29739@rodan.acs.syr.edu> 
isr@rodan.acs.syr.edu (Michael S. Schechter - ISR group account) writes:
> 1) the DSP port:
>     is this the 56001's SCC?? is it both receive and transmit?
>     is it possible to us ethis port to INPUT the frame sync and
>      bit clocks to the DSP? (for phase locking with other ones)
>      Does the NeXT provide 16-bit quality analog output from the
>      56001? (ie, is analog circuitry clean to 90+ dB)

The DSP port provides access to the SSI (I can't think of a reason off 
hand to use the SCC for data aquisition) for sure.  You can have frame 
sync in and bit clock in for sure.  The A/D hardware from Ariel and 
Metaresearch use frame sync (unfortunately, one means R/~L and the other 
means L/~R).   As far as analog output goes, it is handled by D/A 
circuitry in the monitor.    Your host code and set up a DMA channel from 
the DSP to the D/A.  I am not sure of D/A's spec's though.

For the other stuff, I am not sure if it will satisfy your requirements, 
but Ariel is producing a 5 processor 56000 system.

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