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C122-B001-02EN
2-21
2.5 Crossbar
2.5
Crossbar
The crossbar provides sharing of memory in up to eight SBs and the symmetric multi-
processing (SMP) system that supports 32 CPUs. It also provides the flexible I/O
mechanism, which enables up to eight SBs and up to eight IO_Units to be flexibly
connected.
The crossbar consists of the following three types of boards:
- Back Plane (BP)
- Xbar address interconnect board (XAI)
- Xbar data interconnect board (XDI)
Table 2.13 Crossbar specifications
2.5.1
Back Plane (BP)
Connectors for SBs, IO_Units, and other devices are mounted on the BP. Only wiring
and connectors are mounted on the BP, and no DDC or control chip is mounted.
Item
Specifications
Transmission
mode
Stored and forward
Number of ports
SB port: 8
IO_Unit port: 8
Bandwidth/port
SB port: 18.96 GB/s
×
2dir (1.333 GHz)
IO_Unit port: 4.7 GB/s
×
2dir (667 MHz)
Transmission
frequency
800 MHz (FSB 400 MHz)
Data protection
ECC
Содержание PRIMEQUEST 440
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