Crossbar; Back Plane (Bp); Table 2.13 Crossbar Specifications - Fujitsu PRIMEQUEST 480 System Design Manual

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)
Transmission
mode
Number of ports
Bandwidth/port
Transmission
frequency
Data protection
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.
C122-B001-02EN

Table 2.13 Crossbar specifications

Item
Stored and forward
SB port: 8
IO_Unit port: 8
SB port: 18.96 GB/s × 2dir (1.333 GHz)
IO_Unit port: 4.7 GB/s × 2dir (667 MHz)
800 MHz (FSB 400 MHz)
ECC
Specifications
2.5 Crossbar
2-21