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General Information
The drives on the BI-0316 are accessible via the 68 pin high density connector on the front or via the
SCSI bus signals which are available at the User Defined VMEbus P2 connector pins. A host VMEbus
module normally connects to the BI-0316 using a P-Cable at the front or by using a 68 (SCSI-3) or 50
(SCSI-2) wire flatcable at the rear of the module.
The BI-0316 is not memory mapped in the VMEbus address space, this in contrary to other products
which use the VMEbus for data transfers. The BI-0316 module does not occupy any address in the
VMEbus address space and does not rely on any signal (except power) to be available from the VME-
bus. This means that transferring data from or to the BI-0316 does not use any bandwidth of the VME-
bus backplane.
1.2.2
SCSI Daisy-Chaining
In order to support daisy-chain connections, the BI-0316 provides two shielded SCSI-3 device connec-
tors. One on the front and another at the VMEbus P2 connector.
Inside the BI-0316 the SCSI signals are looped from the front to the rear connector. The loop passes
the connection points of the drives on the BI-0316 in such a manner that stub lengths are minimized.
The length of the SCSI signals on the BI-0316 is 0.90 meter.
1.2.3
One Slot Solution
The BI-0316 subsystems have the standard VMEbus double Eurocard form factor and take either one,
two or three slots in a VMEbus rack depending on the height of the fitted drives.
1.2.4
VMEbus Signals
The VMEbus Interrupt Acknowledge and Bus Grant daisy-chain signals are routed on the BI-0316 to
facilitate Automatic-Daisy-Chain (ADC) backplanes.
The VMEbus ACFAIL* signal is used to warn the SCSI devices for a coming loss of power. The drives
can use this signal to prevent write interruptions within a data block. Note that this feature is only active
when the drives that are installed include this feature.
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SCSI Daisy-Chaining
Figure 1-2
Page 1-2
BI-0316
Technical Manual
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