HP Integrity rx7620 Site Preparation Guide, Fourth Editon - HP Integrity rx762 - Page 23

PDH riser board

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Introduction Detailed HP Integrity rx7620 Server Description Figure 1-7 shows a simplified view of the memory subsystem. It consists of two independent access paths, each path having its own address bus, control bus, data bus, and DIMMs. In practice, the CC runs the two paths 180 degrees out of phase with respect to each other to facilitate pipelining in the CC. Address and control signals are fanned out through register ports to the synchronous dynamic random access memory (SDRAM) on the DIMMs. Figure 1-7 Memory Subsystem PDH Riser Board The Platform Dependant Hardware Riser board is a daughter card for the cell board. It contains a micro-processor memory interface microcircuit, processor-dependent hardware including the processor-dependent code (PDC), flash memory, and a manageability microcontroller, called the Platform Dependant Hardware Controller (PDHC) with associated circuitry. The PDH obtains cell board configuration information from cell board signals and from the cell's LPM. The PDH riser board contains circuitry that the Cell board requires to function and, therefore, each cell board must have a PDH Riser installed before it is added to a server. Chapter 1 9

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Chapter 1
Introduction
Detailed HP Integrity rx7620 Server Description
9
Figure 1-7 shows a simplified view of the memory subsystem. It consists of two independent access paths,
each path having its own address bus, control bus, data bus, and DIMMs. In practice, the CC runs the two
paths 180 degrees out of phase with respect to each other to facilitate pipelining in the CC. Address and
control signals are fanned out through register ports to the synchronous dynamic random access memory
(SDRAM) on the DIMMs.
Figure 1-7
Memory Subsystem
PDH Riser Board
The Platform Dependant Hardware Riser board is a daughter card for the cell board. It contains a
micro-processor memory interface microcircuit, processor-dependent hardware including the
processor-dependent code (PDC), flash memory, and a manageability microcontroller, called the Platform
Dependant Hardware Controller (PDHC) with associated circuitry. The PDH obtains cell board configuration
information from cell board signals and from the cell's LPM.
The PDH riser board contains circuitry that the Cell board requires to function and, therefore, each cell board
must have a PDH Riser installed before it is added to a server.