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C-2 Sun Ultra 60 Service Manual • August 2001
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, PSYCHO+ ASIC (UPA-to-PCI bridge), and UPA graphics cards
communicate with each other using the UPA protocol. The CPU modules and the
PSYCHO+ ASIC are UPA master-slave devices. The UPA graphics cards are UPA
slave-only devices.
The Marvin ASIC routes UPA requests packets through the UPA address bus and
controls the flow of data using the XB9+ ASIC. See
FIGURE C-1.
■ UPA Interconnect—page C-4
■ PCI Bus—page C-6
■ UltraSPARC II Processor—page C-8
■ Memory System—page C-9
■ Graphics and Imaging—page C-14
■ Peripherals—page C-15
■ Other RMA Storage Device X-Options—page C-19
■ Keyboard and Mouse, Diskette, and Parallel Port—page C-19
■ Serial Port—page C-22
■ Ethernet—page C-24
■ Audio Card and Connector—page C-28
■ SCSI—page C-30
■ ASICs—page C-33
■ SuperIO—page C-36