HP Integrity rx8620 Installation Guide, Sixth Edition - HP Integrity rx8620 Se - Page 15

Cell Board, PDH bus that goes to the PDH and micro controller circuitry

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Introduction Detailed HP Integrity rx8620 Server Description dependent hardware (PDH) and micro controller hardware. Each cell board holds up to 16 DIMMS. Between one to four cell boards can be installed in the server. A cell board can be selectively powered down for cell replacement without affecting cells in other configured partitions. Figure 1-5 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 several major buses including: • Front side buses (FSB) for each of the four processors • Two memory buses (one going to each half of the main memory array) • Incoming and outgoing I/O bus that goes off board to a SBA chip • Incoming and outgoing crossbar bus that goes off board to the other cell board • PDH bus that goes to the PDH and micro controller circuitry All of these buses come together at the CC chip. Because of space limitations on the cell board, the PDH and micro controller circuitry reside on a riser board that plugs at a right angle into the cell board. The cell board also includes clock circuits, test circuits, and de-coupling capacitors. Chapter 1 15

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Chapter 1
Introduction
Detailed HP Integrity rx8620 Server Description
15
dependent hardware (PDH) and micro controller hardware. Each cell board holds up to 16 DIMMS. Between
one to four cell boards can be installed in the server. A cell board can be selectively powered down for cell
replacement without affecting cells in other configured partitions.
Figure 1-5
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 several major buses including:
•
Front side buses (FSB) for each of the four processors
•
Two memory buses (one going to each half of the main memory array)
•
Incoming and outgoing I/O bus that goes off board to a SBA chip
•
Incoming and outgoing crossbar bus that goes off board to the other cell board
•
PDH bus that goes to the PDH and micro controller circuitry
All of these buses come together at the CC chip.
Because of space limitations on the cell board, the PDH and micro controller circuitry reside on a riser board
that plugs at a right angle into the cell board. The cell board also includes clock circuits, test circuits, and
de-coupling capacitors.