Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!hplabs!hpda!hpcupt1!hpsal2!markw
From: markw@hpsal2.HP.COM (Mark Williams)
Newsgroups: comp.arch
Subject: Re: VME bus broadcasting?
Message-ID: <2280003@hpsal2.HP.COM>
Date: 15 Feb 89 20:01:05 GMT
References: <646@cimcor.mn.org>
Organization: HP System Architecture Lab, Cupertino
Lines: 13

|  I am working on a multiprocessor system on the VME bus.  [How can I]
|  broadcast data to the other processors' local memory?

Try the following:

Dedicate some region of VME address space or a "User defined" address
modifier code (10-1F) to the broadcast address space.  To do a broadcast,
issue a write to the broadcast space.  Your VME processors will
accept the broadcast and no others will be affected.

Depending on what you want to use broadcasts for, you may want to
self-acknowledge (assert DTACK) the VME broadcast at the master
(if, for example, the broadcast is a reset, which must be reliable).