Sun Microsystems Sun Blade 1000 Service Manual page 300

66-MHz cards are restricted to the slot labelled EPCI 1. The following table lists the
mapping of the PCI slots to the two PCI buses, and the type of PCI cards supported
in each slot.
TABLE C-4
Connector
Label
PCI 4
PCI 3
PCI 2
PCI 66 1
Note – Installing a 33 MHz card into a 66 MHz extended peripheral component
interconnect (EPCI) decreases workstation performance.
C.1.8.2 PCI Bus ASICs
SCSI Controller
The SCSI controller ASIC provides an interface between the 33 MHz PCI bus and the
internal and external SCSI buses. The dual SCSI bus controller provides separate
connections to internal and external devices. SCSI channel A is used for internal
devices and supports the SCSI fast and narrow mode. SCSI channel B is used for
external devices and supports the Ultra-Wide SCSI mode.
FC-AL Disk Controller
The FC-AL disk controller ASIC provides an interface between the 64-bit, 66 MHz
PCI bus, the two FC-AL hard drives, and an external FC-AL connector. The FC-AL
controller provides connection to internal and external devices through one channel.
The FC-AL loop supports up to 125 devices. See Section C.1.16, "FC-AL Subsystem"
on page C-39.
C-28 Sun Blade 1000 and Sun Blade 2000 Service Manual • January 2002
PCI Slot-to-PCI Bus Mapping
Conn. No. PCI Bus
J2601 B
J2501 B
J2401 B
J2301 A
Slot Width (bits)/ Clock Rates
Card Type (bits) (MHz)
64/32 or 64 33
64/32 or 64 33
64/32 or 64 33
64/32 or 64 66
DC Voltage (VDC)/
Card Type
5/universal
5/universal
5/universal
3.3/64-bit