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Appendix B Components B-5
FIGURE B-1 CPU/Memory Board Unit (CMU)
The CMU has the following characteristics.
■ Active maintenance of CMUs is possible using the DR function.
■ In CMU maintenance, you can replace the target in units of CMU as a whole, CPU
module, or memory. To perform active maintenance, you need to pull out the CMU from
the system before replacing the target.
■ A CMU can be installed or removed using the DR function during system operation.
■ A dedicated LSI is mounted for system control (SC) and memory access control (MAC).
■ For the bus connecting SC and SC as well as SC and crossbar unit, a high-speed link is
used.
■ For the bus connecting SC and MAC as well as SC and CPU, a high-speed link is used.
■ For the memory, DIMM is used.
■ The CMU has a label bearing the printed component number and manufacture's serial
number.