HP Integrity rx7640, Руководство по установке

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Chapter 1
HP Integrity rx7640 Server and HP 9000 rp7440 Server Overview
Detailed Server Description
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Cell Board
The cell board, illustrated in Figure 1-7, contains the processors, main memory, and the CC application
specific integrated circuit (ASIC) which interfaces the processors and memory with the I/O, and to the other
cell board in the server. The CC is the heart of the cell board, enabling communication with the other cell
board in the system. It connects to the processor dependent hardware (PDH) and micro controller hardware.
Each cell board holds up to two processor modules and 16 memory DIMMs. One or two cell boards can be
installed in the server. A cell board can be selectively powered off for adding processors, memory, or for
maintenance of the cell board, without affecting the other cell board in a configured partition.
Figure 1-7 Cell Board
The server has a 48 V distributed power system and receives the 48 V power from the system backplane
board. The cell board contains DC-to-DC converters to generate the required voltage rails. The DC-to-DC
converters on the cell board do not provide N+1 redundancy.
The cell board contains the following major buses:
• Two front side buses (FSB), each with up to two processors
• Four memory buses (one going to each memory quad)
• Incoming and outgoing I/O bus that goes off board to an SBA chip
• Incoming and outgoing crossbar bus that goes off board to the other cell board
• PDH bus that goes to the PDH and microcontroller circuitry
All of these buses come together at the CC chip.
Because of space limitations on the cell board, the PDH and microcontroller circuitry resides on a riser board
that plugs into the cell board at a right angle. The cell board also includes clock circuits, test circuits, and
de-coupling capacitors.