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- Newsgroups: comp.arch,comp.arch.storage
- Path: sparky!uunet!elroy.jpl.nasa.gov!swrinde!cs.utexas.edu!wotan.compaq.com!twisto.eng.hou.compaq.com!croatia.eng.hou.compaq.com!simonich
- From: simonich@croatia.eng.hou.compaq.com (Chris Simonich)
- Subject: Re: ?Concurrent DMA possible on smarter PC buses (EISA/MCA/Localbus)
- Message-ID: <1992Dec16.211712.13142@twisto.eng.hou.compaq.com>
- Keywords: EISA,MCA,Localbus,VESA,PC,IBM,smartIO
- Sender: news@twisto.eng.hou.compaq.com (Netnews Account)
- Organization: Compaq Computer Corp.
- References: <1gntdfINNu7@cbl.umd.edu>
- Date: Wed, 16 Dec 1992 21:17:12 GMT
- Lines: 18
-
- In article <1gntdfINNu7@cbl.umd.edu> mike@cbl.umd.edu (Michael Santangelo) writes:
- >Can EISA, MicroChannel, or the new VESA LocalBus on PC's allow
- >multiple controllers plugged into them (say two smart bus mastering
- >SCSI disk controllers on one of these buses) xfer data simultaneously
- >to main memory (DMA)?
- >
- Generally, shared bus architectures are shared by time-division multiplexing.
- In short, only one device may use the "bus" at a time, so the answer to your
- question is No.
-
- There was a post about a new I/O architecture from Compaq. This architecture
- does allow multiple controllers to perform simultaneously.
-
- --
- ======================================================
- Christopher Simonich simonich@twisto.compaq.com
- Compaq Computer Corp. [713] 374-1898
- ======================================================
-