| Title: | Embedded and Real Time Modular Computing Conference |
| Moderator: | IRNBRU::GRANT |
| Created: | Tue Sep 05 1995 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 235 |
| Total number of notes: | 1091 |
What's the difference between a PCI master slot and a PCI slave slot,
in DMCC terms ? Which slots on which backplanes are slaves ?
The "practical guide to ... using a bridged backplane" on the AYO web
site (at http://www.ayo.dec.com/oem/public/dmcc/gobi_nt.html) says:
Graphics: PBXGA-JA or PBXGA-JB (#9 Vision 330 PCI graphics) will work
in any primary slot [slots 1-3]. Our suggestion would be to use Slot 3
as this is a slave slot, and leaves the master slots (1 and 2) free for
other cards which may need them.
I wasn't aware that any Digital systems had PCI slave slots, but then I
know dangerously little about hardware.
regards
john
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 231.1 | GONE::PIERSON | Mon May 19 1997 15:59 | 11 | ||
The issue is an x86/alpha variation, as i understand it.
alpha, being a 'real computer' (tm 8)>>) provides enuf control
lines to make all pci slots mastering.
x86, on 'tother hand, has a limited number ('architecturally limited")
number of sets of control lines, so it can only have certain slots
as PCI Bus masters....
regards
dwp
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| 231.2 | Intel: some slots are more equal than others??? | BBPBV1::WALLACE | john wallace @ bbp. +44 860 675093 | Tue May 20 1997 16:31 | 11 |
"x86 can only have certain slots as bus masters"
OK, I love PCs, I can believe that.
Now, where is it documented (for our backplanes) which ones are masters
and which are slaves? (or does the question not make sense?). The words
"master" or "slave" don't seem to be in the new combined backplane
docs.
regards
john
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| 231.3 | GONE::PIERSON | Tue May 20 1997 17:59 | 7 | ||
Its not in the backplane book. The backplanes don't have a
limitation...
(I can't, off hand, find it in the EBM3x-Px book either....)
regards
dwp
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