🚀 go-pugleaf

In article <1992Dec16.211712.13142@twisto.eng.hou.compaq.com>, simonich@croatia.eng.hou.compaq.com (Chris Simonich) writes:
> 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.

I read waht he said and wasn't so sure from the example he gave that the
question he asked is the one he wanted to ask.  To controllers can be doing
DMA trnasfers at the same time byspliting the transfers into smaller chunks
and doing the "time-division multiplexing" of the bus via an arbitraition
scheme.

>There was a post about a new I/O architecture from Compaq.  This architecture
>does allow multiple controllers to perform simultaneously.

If the MIOC in Compaq's proposal is implemented with a multi-port interface
to main memory then it will.  You would loose some on cost of course.
--
Dave Fields	Motorola Computer Group		dfields@urbana.mcd.mot.com
SVR4: The Winchester Mystery Kernel		uiucuxc!udc!dfields