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- Path: sparky!uunet!cis.ohio-state.edu!rutgers!rochester!cantaloupe.srv.cs.cmu.edu!monnier
- From: monnier+@cs.cmu.edu (Stefan Monnier)
- Newsgroups: comp.sys.atari.st.tech
- Subject: Re: Co-operating processors on the Falcon
- Message-ID: <By5r1K.M2E.2@cs.cmu.edu>
- Date: 23 Nov 92 07:20:08 GMT
- References: <721574179.11857@minster.york.ac.uk> <1992Nov13.212206.15649@beaver.cs.washington.edu>
- Sender: news@cs.cmu.edu (Usenet News System)
- Organization: School of Computer Science, Carnegie Mellon
- Lines: 29
- Nntp-Posting-Host: j.gp.cs.cmu.edu
-
- In article <1992Nov13.212206.15649@beaver.cs.washington.edu> bgilbert@cs.washington.edu (Ben Gilbert) writes:
- >
- >They have mentioned this, and it probably will be able to do these in real
- >time. Like I said, the DSP can't access main memory, I think it has to
- >request a DMA transfer or something to get to memory. A previous poster
- >said that the DSP-68030 bus interface was capable of 1 MB/sec or so, but
- >this spec could be off. At any rate, it will be fast enough to allow the
- >things you were mentioning. (JPEG, virtual FAX, etc)
- >
- >
- >Cheers,
- >--
- >Ben Gilbert e-mail : bgilbert@cs.washington.edu
- >Department of Computer Science
- >University of Washington
-
- What do you mean by real-time ?
- JPEG in real-time is not so easy (unless working on VERY small images,
- or slow animation). Specialized hardware can do it, but it involves
- some tricks (the C-Cube chip is told to use more than 200 pipelining
- levels to achieve a 1MB to 25MB decompression per second).
-
- Oh, well, anyway, the output stream can't be much more than 1MB/s so this
- could be the limiting factor (10 100k images/s).
-
-
- Stefan 'I still can't believe Atari was stupid enough to complicate
- the Falcon's design in using 16bits-CPU-ram-access and
- 32bits-Video-ram-access' Monnier
-