HP B160L Bedienungsanleitung Seite 269

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HP N4000 (rp7400) Internals
2. Four DEW Runway ports/converters convert the Prelude’s system bus(es) (which in fact is an
Itanium/Merced bus) into Runway buses for the up to eight CPUs each two CPUs share one
DEW port converter
3. Two IKE I/O controllers attach each to one system bus on one side and to eight (left IKE system
bus 0) or six (right IKE system bus 1) PCI bridges
4. 14 Elroy PCI bridges (LBAs) which convert the I/O channels from the IKE I/O controllers into
PCI buses, to which the PCI slots and core I/O functions attach
The remainder of the system I/O is implemented with common parts also used in other HP 9000 servers:
Two HP Diva Serial [GSP] Multiport UARTs
DEC 21142/43 Fast Ethernet controller (Tulip)
Dual-channel Symbios Logic 53C875 16-bit Ultra-Wide SCSI-2 controllers
Dual-channel Symbios Logic 53C896 Ultra2-Wide SCSI-3 controller
Buses
The system bus architecture is in some ways rather strange, as it provided much more theoretical
bandwidth than could be used under practical circumstances. The designers probably counted on
future CPU upgrades, such as Itanium processors.
Two system buses, 133MHz, each 2.1GB/s peak about 4.3GB/s aggregate (the system bus is in
fact formally an Itanium/Merced system bus)
Eight Runway+/Runway DDR CPU buses, each 2.1GB/s peak aggregate 17.0GB/s peak (these
Runway buses are attached to the two system buses this means the CPUs have a theoretical
bandwidth which cannot be sustained by the system’s main bus)
Four Memory buses, each 2.1GB/s peak aggregate 8.5GB/s (interestingly, the memory bus
bandwidth is much wider than the CPUs’ maximum bus bandwidth, leaving room for anticipated
CPU upgrades, which apparently never really materialized)
24 I/O data channels, each 133MHz 265MB/s 6.4GB/s aggregate
14 PCI-64/66 I/O buses for expansion slots
Three SCSI-3 Ultra2-Wide LVD main storage I/O buses, one for each internal drive and one for
external devices
Memory
ECC SDRAM DIMMs
16 slots
256MB, 512MB, 1GB and 2GB modules supported
32GB maximum
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