Xycom XVME-212 Manual page 50

XVME-212 Manual
August, 1989
Connector
Signal and
Mnemonic Pin Number
A0l-A23 1A:24-30
lC:l5-30
A24-A31 2B:4-11
BBSY* 1B:l
BCLR* lB:2
BERR* 1C:ll
BGOIN*- 1 B:4,6,
BG3IN* 8,l0
BG0OUT*- 1 B:5,7,
BG3OUT* 9,ll
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Table VMEbus Signal Identification (cont'd)
B-l.
Signal Name and Description
ADDRESS BUS (bits l-23): Three-state driven address lines
that specify a memory 'address.
ADDRESS BUS (bits 24-31): Three-state driven bus
expansion address lines.
BUS BUSY: Open-collector driven signal generated 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 DTB master if a
higher level is requesting the bus.
BUS ERROR: Open-collector driven signal generated by a
slave. It 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. These signals indicate that a
DTB master in the daisy-chain requires access to the bus.
B-2