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2Gb SANbloc Series RAID Controller Introduction
48
host and device fibre channel input/output processors (IOPs).
• I/O: The I/O circuit board provides the interface to the disk
drive enclosure (device) and host as well as general support
functions. It also contains the switching power supply, which
generates +3.3 Vdc and +2.5 Vdc from +5 Vdc, hot-swap
circuits, and battery backup unit (BBU) circuits.
• Ethernet (optional): The ethernet circuit board provides an
ethernet interface to the controller, and connections for debug
and out-of-band service to the host and device PCI busses.
The RAID Controller requires a minimum of two circuit
boards: the controller and I/O. The controller and I/O
circuit boards are connected using two 38-pin
controlled impedance connectors. The controller, I/O,
and ethernet circuit boards are assembled into a stack
with the controller and ethernet boards mounted to a
controller cover plate and the I/O board mounted to
the controller board. When the ethernet circuit board
is used, it is mounted to the controller circuit board.
Figure 4-1 shows the three circuit boards in their
relative positions.
Figure 4-1 RAID Controller Circuit Boards