C-2 Sun Ultra 60 Service Manual • August 2001
C.1 System Unit
The system unit is an UltraSPARCport architecture (UPA)-based multiprocessor
machine that uses peripheral component interconnect (PCI) as the I/O bus.
The CPU modules, PSYCHO+ ASIC (UPA-to-PCIbridge), and UPA graphics cards
communicate with each other using the UPAprotocol. The CPU modules and the
PSYCHO+ ASIC are UPAmaster-slave devices. The UPA graphics cards are UPA
slave-only devices.
The Marvin ASIC routes UPArequests packets through the UPA address bus and
controls the flow of data using the XB9+ ASIC. See FIGUREC-1.
■UPAInterconnect—page C-4
■PCI Bus—page C-6
■UltraSPARCII 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—pageC-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