Service manual

C-26 Sun Ultra 2 Series Service Manual • July 1996
C.1.15.6 SLAVIO
The slave I/O (SLAVIO) ASIC provides most of the Sunness I/O requirements. It
contains serial ports, floppy control, and extended bus (EBus) control.
The SLAVIO ASIC includes:
■ Highly integrated for supplying Sunness I/O requirements
■ Integrated keyboard/mouse interface
■ Compliance with IEEE 1496 SBus specification
■ 25-MHz SBus operation
C.1.15.7 CBT
The memory data multiplexer and de-multiplexer (CBT) ASIC is a two-port switch
between a 576-bit memory bus (DSIMM side) and 288-bit memory bus (BMX side).
To maintain a manageable pin count, the CBT ASICs are sliced into 18 parts to form
the complete switch function.
The CBT ASIC provides:
■ 16 bits of MEMORY 288 bus and 32 bits of DRAM bus per ASIC
■ 5-VDC power supply voltage
■ Switch connections controlled by SC_MP ASIC
C.2 Power Supply
The following table lists power budgets for the Ultra 2 series desktop workstation
and the Ultra Enterprise 2 server power supply.
The power supply provides:
■ Remote sensing on +3.0 VDC, +3.3 VDC, and +5.0 VDC
■ Six cables that are required for power distribution: one to the CD-ROM drive, one
to the diskette drive, and four to the motherboard
■ A programmable supply that ranges from 2.5 VDC to 3.5 VDC. The
programmable voltages are controlled by the CPU module(s) to permit CPU
modules having different core voltages to operate conjointly within the same
system unit or server.
Note – Motherboard cables consist of two for the programmable voltages, one for
other voltages, and one for sensing.