System Controller Boards
Sun Confidential: Internal Only
27
SunService Sun Microsystems, Inc. All Rights Reserved. Enterprise Services
System Controller Boards
There are three versions of the system controller:
F3800 System Controller 501-5563
F48x0 and F6800 System Controller 501-5407.
F4800 and F6800 System Controller V2 501-6631
They are all electrically identical except for minor changes to control the
DC-DC converters and the F3800’s system controller has a cooling fan. See
page 34 for SC V2 details.
Each system controller contains a console bus hub (CBH) which connects
the system controller to the console bus which, in turn, is connected to the
system boards, I/O boards, and Sun Fireplane switch boards.
Each system board, I/O board, and Sun Fireplane switch board contains an
SDC. The SDC multiplexes the two console bus connections to allow each
system board to communicate with the currently active system controller.
Note –
With firmware 5.11.x and 5.12.x the console arbitration was limited;
SSC0 was always the main and SSC1 was always the spare.
Starting with 5.13.x firmware, either SC can be the main
CPU
CPU
CPU
CPU
SBBC
SBBC
AR
SDC
System board
I/O board
SBBC
AR
SDC
Schizo1 Schizo0
AR
SDC
SBBC
SBBC
BootBus
BootBus
PCI
SC1
SC0
CBH
CBH
SDC
AR
PCI
PCI
CPU
CPU
Console Arbitration (note)
Sun Fireplane switch
Sun Fireplane switch
