Workstation Overview - Sun Microsystems Sun Blade 1000 Service Manual

C.1.1

Workstation Overview

Sun customers can purchase the Sun Blade 1000 and Sun Blade 2000 workstations as
single or dual UltraSPARC III processor controlled desktop systems. The Sun Blade
1000 and Sun Blade 2000 workstations use shared-memory multiprocessor
architecture with both processors installed on a single motherboard (See
a functional block diagram of the Sun Blade 1000 and Sun Blade 2000 workstations).
Each UltraSPARC III processor has a memory controller installed within the
processor module. When two UltraSPARC III modules are installed on a Sun Blade
1000 or Sun Blade 2000 workstation, only the memory controller installed in CPU
slot 0 is enabled.
The Sun Blade 1000 and Sun Blade 2000 I/O subsystems are designed around a
system bus controller (SBC) ASIC, which is a bridge between the Sun CrossBar
Interconnect address bus, the UPA64S, and the 33 and 66 MHz PCI buses. The
UPA64S is used exclusively to exchange blocks of graphics information between the
graphics card and the SBC ASIC.
Two PCI buses interface with the FC-AL controller and any other boards that are
installed in the workstation's PCI slots. A 33 MHz PCI bus (PCI-B) supports SCSI
controllers that interface with the internal DVD-ROM, or tape drives. A 66 MHz PCI
bus (PCI-A or EPCI for extended PCI bus) supports the Fibre Channel-Arbitrated
Loop (FC-AL) controller that interfaces with the hard drive.
The 33 MHz PCI-B I/O buses are supported by the Peripheral Component I/O-2
(PCIO-2) ASIC. This ASIC is an interface between the 33 MHz PCI bus, the IEEE
1394 port, external universal serial buses (USB), the 10/100 Mbit Ethernet ports, the
boot PROM, and the EBus.
Note – EBus is a slow byte-wide bus for low-speed devices such as the serial port
controller, the audio module, the SuperI/O controller (used primarily as diskette
drive and parallel port interface), and the boot PROM.
A BootBus controller (BBC) ASIC is connected to both UltraSPARC III modules
through a shared BootBus. The BBC ASIC bridges the BootBus to the EBus, to which
slow I/O devices and the boot PROM are attached. The BBC ASIC incorporates an
I2C bus interface and a JTAG master controller. The inter-integrated circuit (I2C)
controller is used to identify the processor modules, the DIMMs, and for
environmental control. The JTAG master controller is used for boundary testing on
the system board, ASIC, and processor testing.
C-2 Sun Blade 1000 and Sun Blade 2000 Service Manual • January 2002
FIGURE C-1,