Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!crdgw1!uunet!mcrware!davely
From: davely@mcrware.UUCP (Dave Lyons)
Newsgroups: comp.sys.m68k
Subject: Addressing VME147 in slave mode
Keywords: Need help programming VME chip
Message-ID: <5840@mcrware.UUCP>
Date: 8 Apr 91 20:33:02 GMT
Organization: Microware Systems Corp., Des Moines, Ia.
Lines: 34


	I'm trying to use two Motorola MVME147 boards in one cage
and get them to be able to access each other's memory.  I've
tried about every combination of values in the VME chip regs
and all I get is bus error.  

Here's what I think the register values should be

Reg             Addr           Value in Sys Master         Value in Slave

Slv Base Addr  $FFFE102B             $0A                        $05
Sys Ctrl Con   $FFFE2001             $F1                        $F0
VME Req Con    $FFFE2003             $07                        $07
VME Mast Con   $FFFE2005             $C0                        $C0
VME Slave Con  $FFFE2007             $DE                        $DE
Timer Con      $FFFE2009             $C0                        $C0
Slave Addr Mod $FFFE200B             $B1                        $B1
Mast Addr Mod  $FFFE200D             $40                        $40
IRQ Handlr Msk $FFFE200F             $FF                        $FF

	I expected the System Master board to have its memory show up on
the VME bus at $800000 (both boards have 4MB on board RAM) and I 
expected the Slave to show up at $400000. 
	If anybody has any idea why the boards aren't able to access each
other's memory I'd really appreciate hearing them.


Thanks for any help, davel

-- 
|Dave Lyons - uunet!mcrware!davely    | Just like a V8 under the hood       |
|-------------------------------------|     of a car made of nails and wood |
| The opinions of the party of the    | Your big heart's gonna break        |
| first part shall not be taken as... |     your little body                |