Re: Code Generation Question

[Brian Orpin <abuse@borpin.co.uk>]

On 17 Mar 2001 01:55:58 GMT, claveman@cod.nosc.mil (Charles H. Sampson)
wrote:

>     Our project uses a heavily populated VME rack with a PowerPC as the
>CPU.  I certainly don't understand all of the VME arcania but it seems
>obvious to me that VME is at its root byte oriented.  One of the cards
>in the rack requires 16-bit reads and writes to its memory.  If you at-
>tempt an 8-bit read or write there is no indication of error; instead
>the board silently zeros the other byte of the 16-bit word.

This function is controlled on our boards (DY4) by a chip called the
SCV64.  By changing registers in that chip you can control how the VME
transfers are conducted.

example http://www.dy4.com/Support/TechPapers.htm

HTH

-- 
Brian Orpin    BAE SYSTEMS, Edinburgh
"If you really know C++, there isn't much you can't do with it, though it may 
not always be what you intended!"  Tucker Taft 1998