Xycom XVME-560 Manual page 54

XVME-560 Manual
September, 1984
Table B-l. Pl - VMEbus Signal Identification (cont'd)
Connector
Signal
Mnemonic Pin Number
A24-A3 1 2B: 4-11
1B: 1
BBSY *
BCLR* 1B: 2
lC: 11
BERR*
BG0IN*- 1B: 4,6,
BG3IN*
1B: 5,7,
BG0OUT*-
BG30UT*
IB: 12-15
BR0*-BR3*
DSO* 1A: 13
1A: 12
DSl*
and
ADDRESS bus (bits
expansion address lines.
BUS BUSY - Open-collector driven signal gener-
ated
is using the bus.
BUS CLEAR -
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.
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
8,l0
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
9,ll 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
data transfer will occur on data bus lines
(D00-D07).
DATA STROBE 1 - Three-state driven signal that
indicates during byte and word transfers that a
data transfer will occur on data bus lines
(D08-D15).
Signal Name and Description
24-31)
by
the current DTB master to indicate that
Totem-pole driven signal generated
This signal indicates that an
B-2
- Three-state driven bus
.
it