Sun Microsystems 220R - Manual (Page 249)

APPENDIX
C
Functional Description
This appendix provides a functional description for the following:
4 Section C.1 “System Unit” on page 249
4 Section C.1.14 “Power Supply” on page 274
4 Section C.1.17 “Main Logic Board” on page 277
The following items are not supported on the Sun Enterprise 220R server:
4 Graphics and imaging card
4 Diskette drive
4 Audio card
C.1 System Unit
The system unit is an UltraSPARC port architecture (UPA)-based multiprocessor
machine that uses peripheral component interconnect (PCI) as the I/O bus. The CPU
modules, U2P ASIC (UPA-to-PCI bridge), and UPA graphics cards communicate with
each other using the UPA protocol. The CPU modules and the U2P ASIC are UPA
master-slave devices. The UPA graphics cards are UPA slave-only devices. The QSC
ASIC routes UPA request packets through the UPA address bus and controls the flow
of data using the XB9+ ASIC. For further information, see the following items:
4 Section C.1.1 “UPA” on page 252
4 Section C.1.2 “PCI Bus” on page 253
4 Section C.1.3 “UltraSPARC II Processor” on page 254
4 Section C.1.4 “Memory System” on page 255
4 Section C.1.5 “Graphics and Imaging” on page 259
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