Xycom XVME-560, Manual

Page: 54 / 70

XVME-560 Manual
September, 1984
Signal
Mnemonic
A24-A3 1
BBSY *
BCLR*
BERR*
BG0IN*-
BG3IN*
BG0OUT*-
BG30UT*
BR0*-BR3*
DSO*
DSl*
Table B-l. Pl - VMEbus Signal Identification (cont’d)
Connector
and
Pin Number
2B: 4-11
1B: 1
1B: 2
lC: 11
1B: 4,6,
8,l0
1B:
5,7,
9,ll
IB: 12-15
1A: 13
1A: 12
Signal Name and Description
ADDRESS bus (bits
24-31)
- Three-state driven bus
expansion address lines.
BUS
BUSY - Open-collector driven signal gener-
ated
by
the current DTB master to indicate that
it
.
is using the bus.
BUS
CLEAR
- Totem-pole driven signal generated
by the bus arbitrator to
request release
by the
current DTB master in the event that a higher
level
is requesting the bus.
BUS ERROR
- Open-collector driven
signal gener-
ated by a
slave. This signal indicates that an
unrecoverable
error has occurred
and
the bus cycle
must be aborted.
BUS GRANT (0-3) IN
-
Totem-pole driven signals
generated by the Arbiter or Requesters. Bus Grant
In and
Out signals form a daisy-chained bus grant.
The
Bus Grant
In
signal
indicates
to
this board that
it may
become
the next bus master.
BUS GRANT (0-3) OUT - Totem-pole driven
signals generated
by Requesters. Bus Grant In and
Out signals form a daisy-chained bus grant. The
Bus Grant Out signal indicates
to the
next
board
that
it may
become
the next bus master.
BUS REQUEST (0-3) - Open-collector driven sig-
nals
generated by
Requesters. These signals indi-
cate that a
DTB
master
in the daisy-chain requires
access to the bus.
DATA STROBE 0
- Three-state driven signal that
indicates during byte and word transfers that a
d a t a t r a n s f e r w i l l o c c u r o n d a t a b u s l i n e s
(D00-D07).
DATA STROBE 1 - Three-state driven signal that
indicates during byte and word transfers that a
d a t a t r a n s f e r w i l l o c c u r o n d a t a b u s l i n e s
(D08-D15).
B-2