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.
PDH Riser Board
The PDH riser board is a small card that plugs into the cell board at a right angle. The PDH riser
interface contains the following components:
• Microprocessor memory interface microcircuit
• Hardware including the processor dependant code (PDH) flash memory
• Manageability microcontroller with associated circuitry
The PDH obtains cell board configuration information from cell board signals and from the cell
board local power module (LPM).
Central Processor Units
The cell board can hold up to four CPU modules. Each CPU module can contain up to two CPU
cores on a single socket. Modules are populated in increments of one. On a cell board, the
processor modules must be the same family, type, and clock frequencies. Mixing of different
processors on a cell board or partition is not supported. Refer to Table 1-1 for the load order that
must be maintained when adding processor modules to the cell board. Refer to Figure 1-8 for
the locations on the cell board for installing processor modules.
NOTE: Unlike previous HP cell based systems, the HP Integrity rx7640 server cell board does
not require that a termination module be installed at the end of an unused FSB. System firmware
is allowed to disable an unused FSB in the CC. This enables both sockets of the unused bus to
remain unpopulated.
Table 1-1 Cell Board CPU Module Load Order
Socket 0Socket 1Socket 3Socket 2Number of
CPU Modules
Installed
CPU installedEmpty slotEmpty slotEmpty slot1
CPU installedEmpty slotEmpty slotCPU installed2
CPU installedCPU installedEmpty slotCPU installed3
CPU installedCPU installedCPU installedCPU installed4
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