Processor Bus; Zx1 I/O And Memory Controller; Memory - HP rp3440 Service Manual

mechanical compatibility and support circuitry exist. A processor CSR consists of a dual processor
module with heatsink assembly.
One end of the FSB is terminated with an I/O ASIC. The other end of the bus is terminated with
a CSR. An additional CSR can be loaded in the middle. For the system to function properly, the
processor farthest away from the I/O ASIC must be loaded at all times to electrically terminate
the FSB.
Each processor module plugs directly into and is powered by its own 12V to 1.2V power-pod.
Other power for the system board comes from multiple on-board DC/DC converters. Each
processor module is attached to the board through a ZIF socket and the entire CSR secured down
by a heatsink bolster plate.

Processor Bus

The processor bus (Front Side Bus [FSB]) in this product runs at 200 MHz. Data on the FSB are
transferred at a double data rate, which enables a peak FSB bandwidth of 6.4 Gb/sec.

ZX1 I/O and Memory Controller

HP 9000 rp3410 and rp3440 servers support the following features of the ZX1 I/O and memory
controller chip:
• 3.3 GB/s peak IO bandwidth
• Provides eight communication paths
• Peak memory bandwidth of 8.5 GBs
• Two memory cells, 144 data bits each

Memory

The memory subsystem provides two memory cells, each of which is 144 data bits wide. Each
cell has six DIMM slots, which means a total of 12 DIMM slots are available. The memory bus
clock speed is 133 MHz, and the data transfer rate is 266M transfers/second as data is clocked
on both edges of the clock. The peak data bandwidth for this memory subsystem design is 8.5
GB/s. DIMMs must be loaded in quads with qualified modules, with the exception of 256 MB
DIMMs which is loaded in pairs. Memory is protected by data error correction code (ECC), and
the hardware implementation supports the chip-spare feature.
The minimum amount of memory that you can install is 512 MB (2x256 MB modules in a HP
9000 rp3410 model A7136A server), and 1 GB (4x256 MB modules in other HP 9000 rp34x0
servers). The maximum amount of memory that you can install is limited to 24 GB (12 x 2 GB
modules) or 32 GB (8 x 4 GB modules) in a HP 9000 rp3440 server.
This design does not support any non industry-standard DDR DIMMs. Only qualified DIMMs
are supported.
Figure 1-6 shows the memory block diagram.
Detailed Server Description 25