Path: utzoo!attcan!uunet!husc6!bbn!uwmcsd1!ig!agate!ucbvax!snowwhite.UUCP!andy
From: andy@snowwhite.UUCP (Andy Pfiffer)
Newsgroups: comp.sys.transputer
Subject: Re: SUN (VME) Interface
Message-ID: <8805241845.AA03694@snowwhite.com>
Date: 24 May 88 18:45:51 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 33


 +---- Adrian Cockcroft, "Subject: Re: SUN (VME) Interface" - 05/16/88 @ 9:26am
 | 
 | There have been several approaches, broadly
 | 
 | 1) a serial link adaptor on the VME bus
 | 
 | 2) dual ported memory between VME and Transputer
 | 
 | 3) a hybrid of the two
 +----

 +----
 | Approach 2) is faster. Topologix's board has 4 T800's, one of which is
 | dual ported onto the bus.
 +----

Actually, it is more like 3) above.  There is a link adaptor on board which
does straddle the VME bus.  All external memory (up to 16MB) of the first
T800 on the board is dual-ported onto the VME bus as well.  When sufficient
quantities of 4Mb DRAM is available, we'll put up to 64MB of DRAM per T800.

Faster still is what is planned for our "C" boards: all 4 T800's per board
can be software selected to dual-port their external memory into the VME bus.
Other goodies include VME mastership and block-mode transfer.

    ...stay tuned, more to come!


--
Andy Pfiffer			  Topologix, Inc. (303) 421-7700
Trillium Diving Team (ret.)       4860 Ward Road / Denver, CO 80033
            "...that's the way a Transputer works, right?"