3-16
Computer Group Literature Center Web Site
Interconnect Signals
3
SCSI interface connector
The SCSI port is the connector labeled SCSI INTERFACE on the front
panel of the MVME712M, connected to connector J4 on the top of the
board. Each pin connection, signal mnemonic, and signal characteristic for
the SCSI port connector is listed in the following table
Table 3-6. Connector SCSI interface interconnect signals
Pin
Number
Signal
Mnemonic
Signal Name and Description
1-25
GND
GROUND
26
DB00*
DATA bus (bit 0) - least significant bit and the lowest
priority during the arbitration phase.
27
DB01*
DATA bus (bit 1)
28
DB02*
DATA bus (bit 2)
29
DB03*
DATA bus (bit 3)
30
DB04*
DATA bus (bit 4)
31
DB05*
DATA bus (bit 5)
32
DB06*
DATA bus (bit 6)
33
DB07*
DATA bus (bit 7) - most significant bit and the highest
priority during the arbitration phase.
34
DBP*
DATA bus (parity) - data parity is odd. Use of parity is
a system option. Parity is not valid during the
arbitration phase.
35-37
GND
GROUND
38
TERMPWR
TERMINATOR POWER
39,40
GND
GROUND
41
ATN*
ATTENTION - signal driven by the initiator.
Indicates the attention condition.
42
GND
GROUND
43
BSY*
BUS BUSY - OR-tied signal that indicates that the bus
is being used.
44
ACK*
ACKNOWLEDGE - signal driven by an initiator to
indicate an acknowledgment for a REQ/ACK data
transfer handshake.
45
RST*
RESET - OR-tied signal that indicates the RESET
condition.
