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BI-0316
2.4
SCSI-2 and SCSI-3 Cabling Differences
The BI-0316 supports both the traditional SCSI (or SCSI-1) and SCSI-2 version as well as the new
SCSI-3 version. For reasons of clarity, when referring to the 8-bit SCSI, SCSI-1 or SCSI-2 versions, the
term SCSI-2 will be used.
2.4.1
SCSI-2 Cabling
SCSI-2 devices are daisy-chained using a common 50-conductor A-cable and, optionally, a 68-conduc-
tor B-cable. Both ends of each cable are terminated. The primary SCSI-2 bus carries an 8-bit data bus
and control signals. A primary SCSI-2 bus A-cable provides therefore an 8-bit data path. In systems
that employ the wide SCSI option, wide SCSI devices additionally connect to the B-cable. This second-
ary SCSI-2 bus carries an additional 24-bit data bus that, used in conjunction with a primary SCSI-2
bus, provides a 32-bit data path.
The BI-0316 supports the A-cable option of the SCSI-2 standard.
2.4.2
SCSI-3 Cabling
SCSI-3 devices are daisy-chained using a common 68-conductor P-cable and, optionally, a 68-conduc-
tor Q-cable. Both ends of each cable are terminated. The primary SCSI-3 bus carries a 16-bit data bus
and control signals. A primary SCSI-3 bus P-cable provides therefore a 16-bit data path. A secondary
SCSI-3 bus Q-cable carries an additional 16-bit bus that, used in conjunction with a primary SCSI-3
bus, provides a 32-bit data path.
The BI-0316 supports the P-cable option of the SCSI-3 standard.
2.5
SCSI Bus Connection Options
The BI-0316 can be connected to a SCSI bus initiator through the front or via the backplane connector.
When the host is connected to the front connector, the backplane connector can be used to terminate
or daisy-chain the SCSI bus signals. When the host is connected to the backplane connector, the front
connector can be used for termination or daisy-chaining of the SCSI bus signals.
At the front, a 68-pin high density connector (P3) with 2-56 jack screws for cable retention is used. This
connector complies to the SCSI-3 standard and connects directly to a Single-Ended or Differential bus
SCSI-3 P-cable.
The P3 connector contact assignments for Single-Ended use can be found in Table E-4, "P3, P5-P6
SCSI-3 Connectors (Single-Ended)" on page E-4. When the BI-0316 is used in a Differential bus the
contact assignments are given in Table E-5, "P3, P5-P6 SCSI-3 Connectors (Differential)" on page E-5.
2.5.1
SCSI-3 Option
This option uses the BI-0319 to connect to the SCSI bus signals on the VMEbus P2.
Technical Manual
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Functional Description
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