Pci Bus; Pci Cards - Sun Microsystems Sun Blade 1000 Service Manual

C.1.7 UPA
The UltraSPARC port architecture (UPA) provides a packet-based interconnect
between the system bus controller (SBC) ASIC and the graphics cards.
C.1.8

PCI Bus

The peripheral component interconnect (PCI) buses used in the Sun Blade 1000 and
Sun Blade 2000 workstation are 32-bit or 64-bit. These busses have multiplexed
address and data lines. The PCI buses provides electrical interconnect between
highly integrated peripheral controller components, peripheral add-on devices, and
the processor and memory systems.
There are two PCI buses in the Sun Blade 1000 and Sun Blade 2000 workstations. The
first bus is a one-slot, 3.3-VDC, 64-bit or 32-bit, 66-MHz bus. The second bus is a
three-slot, 5.0-VDC, 64-bit or 32-bit, 33-MHz bus. Both buses are controlled by the
SBC ASIC. There are two on-board PCI devices, the SCSI controller and the PCIO-2
ASIC, on the 33-MHz PCI bus. The ISP2200A FC-AL disk controller is located on the
64-bit 66-MHz PCI bus.
C.1.8.1

PCI Cards

PCI cards come in a variety of configurations. Not all cards fit or operate in all PCI
slots, so it is important to know the specifications of your PCI cards and the types of
cards supported by each PCI slot in the workstation.
Some PCI cards are as short as 6.875 inches (17.46 cm) in length (called "short"
cards), while the maximum length of PCI cards is 12.28 inches (31.19 cm, called
"long" cards). Each slot in the Sun Blade 1000 or Sun Blade 2000 workstation can
accommodate either a long or a short cards.
Older PCI cards communicate over 32-bit PCI buses, while many newer cards
communicate over wider 64-bit buses.
Older PCI cards operate at 5 VDC, while newer cards are designed to operate at
3.3 VDC. Cards that require 5 volts will not operate in 3.3 volt slots, and 3.3 volt
cards will not operate in 5 volt slots. "Universal" PCI cards are designed to operate
on either 3.3 volts or 5 volts, so these cards can be inserted into either type of slot.
The workstation provides three slots for 5 volt cards and one slot for a 3.3 volt card.
All four PCI slots accept universal cards.
Most PCI cards operate at clock speeds of 33 MHz, while some newer cards (EPCI)
operate at 66 MHz. All four PCI slots can accept 33 MHz cards.
Appendix C Functional Description C-27