Chapter 4 PA-RISC Computer Systems - OpenPA.net

HP 9000 rp4410 & rp4440 Internals
� Six Mercury zx1 IOAs (I/O adapters) connect the PCI-X slots and I/O devices to the zx1 MIO
with an aggregate bandwidth of 4.0 GB/s on eight 0.5 GB/s channels
1. PCI-X 64/133 I/O slot on two channels — 1.0 GB/s
2. PCI-X 64/133 I/O slot on two channels — 1.0 GB/s
3. Two PCI-X 64/66 I/O slots on one channel — 0.5 GB/s
4. Two PCI-X 64/66 I/O slots on one channel — 0.5 GB/s
5. Core I/O adapters (SCSI, Ethernet etc.) on two channels — 1.0 GB/s (one channel to dualport
Gigabit Ethernet and Ultra320 SCSI controller, one channel to the management LAN,
serial and USB2.0 ports)
The rest are standard third-party I/O chips:
� Dual-channel Ultra320 SCSI controller
� Dual-port Gigabit Ethernet
� USB2.0 controller
� IDE controller
An interesting aspect of the rp4400’s bus setup is that the same 6.4 GB/s processor bus is shared between
up to two CPUs on the rp4410 and up to four CPUs on the rp4440.
Buses
� Itanium 2/zx1 processor bus 6.4 GB/s
� Two independent zx1 memory buses, 200 MHz, each 6.4 GB/s
� Eight zx1 I/O channels/buses, aggregate 4.0 GB/s
� Two PCI-X 64/133 I/O buses
� Two PCI-X 64/66 I/O buses
� SCSI-3 Ultra320 (LVD) storage I/O bus
� IDE secondary storage I/O bus
Memory
� PC2100 parity ECC DDR CL2 SDRAM DIMMs
� 16- or 32-DIMM carrier board
� 1 GB minimum memory
� 128 GB maximum memory
� 12.8 GB/s memory bandwidth
� 105ns memory latency
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