SCSI Bus Interface
Table 7-1.
SCSI Bus Signals
Mnemonic
Name
Signal
Description
DBO
Data Bus
Data Bus Bit 0
DB1
Data Bus
Data Bus Bit 1
DB2
Data Bus
Data Bus Bit 2
DB3
Data Bus
Data Bus Bit 3
DB4
Data Bus
Data Bus Bit 4
DB5
Data Bus
Data Bus Bit 5
DB6
Data Bus
Data Bus Bit 6
DB7
Data Bus
Data Bus Bit 7
DBP
Data Bus
Data Bus Parity
ACK
Acknowledge
Indicates acknowledgment for a
REQ/ACK data transfer handshake
operation.
REQ
Request
Indicates a request for a REQ/ACK
data transfer handshake
operation.
ATN
Attention*
Indicates ATTENTION condition
(i.e., the Initiator has a
message to send to the Target).
RST
Reset*
Indicates RESET condition (i.e.r
clears the SCSI bus of all
activity).
SEL
Select
Used to select and/or reselect a
SCSI bus device.
BSY
Busy
I
Indicates the SCSI bus is being
used.
C/D
Control/Data
Indicates command
,
status
information transfer# or data in
and/or data out transfer.
I/O
Input/Output
Indicates direction of data
movement on the data bus with
respect to an Initiator.
MSG
Message
Indicates the SCSI bus is in the
Message Phase.
*This condition is described in Section 5 of the Emulex SCSI Disk
Controller Programming Reference Manual (manual number MD2352501).
Interfaces 7-7
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